ОБЛАДАЮЩИЕ ПОКРЫТИЕМ АБРАЗИВНЫЕ МАТЕРИАЛЫ И СПОСОБ ИХ ИЗГОТОВЛЕНИЯ

Изобретение может быть использовано при изготовлении абразивных инструментов. Используют множество сверхтвердых абразивных частиц субмикрометрового или нанометрового размера алмаза или кубического нитрида бора или комбинации этих материалов и обладающие витреофильными поверхностями, способными образовывать химические связи с оксидами. Наносят на частицы покрытия из оксидного материала-предшественника и затем термически обрабатывают для высушивания и очистки покрытий. Покрытия выбраны из группы, включающей нитриды титана, ванадия, ниобия, тантала, молибдена и вольфрама или карбиды ванадия, ниобия, тантала, молибдена и вольфрама, фазу анатаза диоксида титана, фазу рутила диоксида титана, тетрагональный диоксид циркония, моноклинный диоксид циркония, диоксид циркония, стабилизированный оксидом иттрия или оксидом магния, переходные структуры или альфа-фазу оксида алюминия и оксиды ванадия, ниобия, тантала, гафния, молибдена и вольфрама, кварцевое стекло. Изобретение позволяет наносить покрытия ...

ОГНЕСТОЙКИЙ ПРОДУКТ И ЕГО ПРИМЕНЕНИЕ

Изобретение относится к огнестойкому составу, а также к его применению преимущественно для облицовки плавильных устройств для цветных металлов. Состав преимущественно содержит по меньшей мере 30 мас.% необработанного оливина с грубыми частицами, содержащего форстерит в количестве, например, по меньшей мере 70 мас.% и имеющего размеры частиц более 0,1 мм; по меньшей мере 35 мас.% оксида магния в форме муки с размером частиц1 мм; карбид кремния в форме муки с размером частиц1 мм; до 10 мас.% тонкодисперсной кремниевой кислоты и до 10 мас.% антиокислителя. Состав применяют в смеси с 2-10 мас.% кремнезоля в виде формованных кирпичей или огнестойкой заливочной массы, в которую для достижения необходимой пластичности добавляют воду. Технический результат изобретения – улучшение стойкости огнеупоров к расплавам фаялитовых шлаков и к воздействию сульфатов при температуре применения. 6 н. и 16 з.п. ф-лы, 1 табл., 7 ил.

ТЕПЛОИЗОЛЯЦИОННОЕ ИЗДЕЛИЕ

Теплоизоляционное изделие представляет собой стойкий к высоким температурам мат или плиту из неорганического волокна, пропитанный коллоидным неорганическим оксидом, прессованный и высушенный. Коллоидный неорганический оксид представляет собой композицию коллоидного неорганического оксида в комбинации с гелирующим агентом, при этом композиция коллоидного неорганического оксида включает коллоидный кремнезем, гелирующий агент в количестве примерно от 0,01 до 10 мас.% неорганических соли или оксида и примерно от 0,01 до 10 мас.% кислоты, а также воду в количестве, достаточном для растворения гелирующего агента, при необходимости в количестве, составляющем вплоть до примерно 70 мас.% от композиции. Изделие имеет рабочую температуру по меньшей мере до примерно 1000°С и сохраняет механическую целостность после воздействия рабочей температуры, имеет плотность больше 700 кг/сми прочность на сжатие по меньшей мере примерно 6800 кПа (70 кгс/см). Технический результат: снижение теплопроводности при ...

РАСКЛИНИВАЮЩИЕ НАПОЛНИТЕЛИ И СПОСОБЫ ИХ ПОЛУЧЕНИЯ

Изобретение относится к гидравлическому разрыву пласта с использованием расклинивающих наполнителей. Технический результат - уменьшение удельной массы расклинивающего наполнителя, облегчение транспортирования в жидкости для гидроразрыва пласта, более глубокое введение в трещину до осаждения. Расклинивающий наполнитель включает в себя изготовленную из предшественников керамики - алюмосиликатов, содержащих геополимеры, порошковую золь-гель-керамику, имеющую округлость и прочность на сжатие, подходящие для использования в качестве расклинивающего наполнителя. Способ получения расклинивающего наполнителя включает в себя следующие операции: формирование золь-гель-композиции смешиванием предшественников керамики - алюмосиликата и водного раствора силиката щелочного металла; формование гранул и сглаживание их поверхности в грануляторе; их отверждение с получением золь-гель-керамики в виде частицы, имеющей округлость и прочность на сжатие, подходящие для использования в качестве расклинивающего ...

СПОСОБ ПОЛУЧЕНИЯ МУЛЬТИФЕРРОИКОВ НА ОСНОВЕ ФЕРРОМАГНИТНОЙ СТЕКЛОМАТРИЦЫ

Изобретение относится к технологии получения оксидных стеклообразных композитов - мультиферроиков, сочетающих в себе ферромагнитные и электрические свойства. Cтеклокристаллический композит получают путём создания пористой стекломатрицы из железосодержащего силикатного стекла, в поровое пространство которой внедряют сегнетоэлектрическую фазу Ba0,75Sr0,25TiO3. Получают водный раствор титанил-нитрата, добавляют водные растворы нитрата бария или ацетата бария и нитрата стронция, смешивают с глицином в стехиометрическом соотношении для получения сложного оксида Ba0,75Sr0,25TiO3. В полученный раствор помещают пластину пористого ферромагнитного стекла. Пропитанный образец извлекают, высушивают, подвергают термообработке при температуре 550-700°С с выдержкой 0,5-3 часа. Анализ магнитных свойств полученных стеклокерамических композитов показал значительное увеличение намагниченности сформированного композитного материала по сравнению с исходной стекломатрицей. 4 ил.

ШЛИФОВАЛЬНЫЙ КРУГ И СТЕКЛООБРАЗНОЕ СВЯЗУЮЩЕЕ ДЛЯ ШЛИФОВАЛЬНЫХ КРУГОВ

Изобретение может быть использовано при изготовлении абразивных шлифовальных кругов со стеклообразным связующим. Часть абразивного порошка включает золь-гель окись алюминия в качестве абразива. Шлифовальный круг обладает улучшенными характеристиками при сохранений формы. Изобретение предусматривает использование композиции связующего, которая обеспечивает повышение сохранности вершины или формы и улучшение механических характеристик инструмента при использовании золь-гель окиси алюминия в качестве абразивных материалов. 2 с. и 5 з.п.ф-лы, 2 ил., 6 табл.

Раствор, улучшающий прозрачность диоксидциркониевой керамики

... 1. Набор, содержащий:раствор,изделие из пористого диоксида циркония,необязательно принадлежности для нанесения,при этом раствор содержитпо меньшей мере один катион по меньшей мере одного агента, не придающего окраску, выбранный из ионов Y, Gd, La, Yb, Tm, Mg, Ca и их смесей,по меньшей мере один растворитель для по меньшей мере одного иона,необязательно по меньшей мере один комплексообразующий агент,необязательно по меньшей мере один загущающий агент,необязательно по меньшей мере одно органическое маркерное вещество,необязательно по меньшей мере одну добавку,причем изделие из пористого диоксида циркония характеризуется изотермой типа IV адсорбции и/или десорбции Nв соответствии с классификацией Международного союза теоретической и прикладной химии (IUPAC).2. Набор по п. 1, отличающийся тем, что изделие из пористого диоксида циркония характеризуется по меньшей мере одним из следующих признаков:петлей гистерезиса при анализе в отношении его поведения при адсорбции и десорбции азота;изотермой ...

Противообледенительное покрытие для линий электропередач

... 1. Способ формирования пьезоэлектрического покрытия на кабеле линии электропередачи, который включает:подачу кабеля линии электропередачи через золь-гель материал, содержащий пьезоэлектрический материал,при этом указанная подача формирует неотвержденный слой золь-гель материала по меньшей мере на наружной поверхности кабеля линии электропередачи; иотверждение неотвержденного слоя золь-гель материала,при этом указанное отверждение формирует пьезоэлектрическое покрытие на кабеле линии электропередачи, причемуказанное пьезоэлектрическое покрытие содержит указанный пьезоэлектрический материал.2. Способ по п. 1, в котором золь-гель материал содержится в емкости золь-геля, имеющей днище, и в котором кабель линии электропередачи подают через указанное днище емкости для золь-геля.3. Способ по п. 2, в котором днище емкости для золь-геля содержит герметизированное отверстие, которое позволяет подавать кабель линии электропередачи через днище емкости для золь-геля и предотвращает вытекание золь-гель ...

ПОЛИМЕРИЗУЕМЫЙ НЕОРГАНИЧЕСКИЙ-ОРГАНИЧЕСКИЙ РАСТВОР ПРЕДШЕСТВЕННИКА ДЛЯ НАНОРАЗМЕРНЫХ ОКСИДОВ МЕТАЛЛОВ, ЕГО ПРИМЕНЕНИЕ ДЛЯ ПОЛУЧЕНИЯ СПЕЧЕННОЙ МЕМБРАНЫ И ЕЕ ПРИМЕНЕНИЕ

... 1. Полимеризуемый неорганический-органический раствор предшественника для наноразмерных оксидов металлов, получаемый способом, включающим стадии: ! (a) получение раствора, по крайней мере, одного катиона металла и органического соединения, и ! (b) нагревание раствора до температуры от 20 до 300°С с получением полимеризуемого раствора предшественника для наноразмерных оксидов, и ! (c) завершение нагревания, когда вязкость при комнатной температуре составит от 10 до 500 мПа·сек. ! 2. Полимеризуемый неорганический-органический раствор предшественника по п.1, где, по крайней мере, один катион металла выбирают из группы, включающей Се, Gd, Co, Al, Sm, Fe, Mg, Ni, Y, Zr, La, Sr, Mn, Sc, Ti и их смеси. ! 3. Полимеризуемый неорганический-органический раствор предшественника по п.1, где, по крайней мере, одно органическое соединение имеет карбонильную группу или является мономерным соединением. ! 4. Полимеризуемый неорганический-органический раствор предшественника по п.3, где, по крайней мере, ...

СПОСОБ ИЗГОТОВЛЕНИЯ ПОРИСТЫХ ИЗДЕЛИЙ СФЕРИЧЕСКОЙ ФОРМЫ НА ОСНОВЕ ДИОКСИДА ЦИРКОНИЯ

Изобретение относится к способу получения изделий сферической формы на основе диоксида циркония с трансформируемой тетрагональной кристаллической фазой и может быть использовано для изготовления пористых износостойких деталей или носителя катализаторов и сорбентов, а также фильтра для очистки выхлопных газов и сточных вод. Способ изготовления изделий сферической формы на основе диоксида циркония, стабилизированного оксидом кальция, включает предварительный мокрый помол диоксида циркония со стабилизатором в вибромельнице для получения шликера, в который добавляют диспергатор и водный раствор альгината натрия, после чего вакуумируют и дозируют в виде капель через сопло в раствор отвердителя. Полученные гранулы промывают, сушат, помещают в высокотемпературную печь и спекают при температуре 1000-1200С. В качестве основы используют бадделеитовый концентрат, который предварительно измельчают до размера частиц ZrOменее 30 нм и механоактивируют путем совместного мокрого высокоэнергетического помола ...

ТЕПЛОИЗОЛЯЦИОННОЕ ИЗДЕЛИЕ

... 1. Теплоизоляционное изделие, представляющее собой стойкий к высоким температурам мат или плиту из неорганического волокна, пропитанный коллоидным неорганическим оксидом, прессованный и высушенный, отличающийся тем, что коллоидный неорганический оксид представляет собой композицию коллоидного неорганического оксида в комбинации с гелирующим агентом, при этом изделие имеет рабочую температуру, по меньшей мере, до примерно 1000°С и сохраняет механическую целостность после воздействия рабочей температуры, имеет плотность больше или равную примерно 500 кг/см3, и прочность на сжатие по меньшей мере примерно 4,900 кПа (50 кгс/см2). ! 2. Теплоизоляционное изделие по п.1, отличающееся тем, что коллоидный неорганический оксид представляет собой композицию коллоидного кремнезема в комбинации с гелирующим агентом, при этом изделие имеет плотность больше или равную 700 кг/см3, и прочность на сжатие, по меньшей мере, примерно 7,800 кПа (80 кгс/см3). ! 3. Теплоизоляционное изделие по п.2, отличающееся ...

УСКОРЕННОЕ ЗАЖИВЛЕНИЕ РАН С ПОМОЩЬЮ НОВОГО ВОЛОКНИСТОГО СЛОЯ

... 1. Многослойная повязка, имеющая, по меньшей мере, следующее строение: ваточный холст 1, который должен контактировать с раной, и мембрана 3, которая водонепроницаема и включает в себя нерастворимый в воде полимер, причем мембрана 3 либо является липким пластырем 3 и включает в себя клеящуюся часть, которая приклеивается к коже, окружающей рану, либо не имеет клеящейся части и приклеивается к коже, окружающей рану, только в том случае, если на кожу, окружающую рану, наносят клей, и причем между мембраной 3 и ваточным холстом 1 имеется непрочная, легко разрываемая адгезивная связь, либо вообще никакой связи. 2. Многослойная повязка по п.1, причем, по меньшей мере, один нерастворимый в воде полимер мембраны 3 является - полипропиленом, поливинилхлоридом или полиуретаном. 3. Многослойная повязка по п.1, причем мембрана 3 представляет собой самоклеящийся гидрополимер. 4. Многослойная повязка по п.1, причем многослойная повязка включает в себя между мембраной 3 и холстом 1 вторую мембрану 2, ...

ШЛИФОВАЛЬНЫЙ КРУГ И СТЕКЛООБРАЗНОЕ СВЯЗУЮЩЕЕ ДЛЯ ШЛИФОВАЛЬНЫХ КРУГОВ

Изобретение касается абразивных шлифовальных кругов со стеклообразным связующим, в которых часть абразивного порошка включает золь-гель окиси алюминия в качестве абразива. Шлифовальный круг обладает улучшенными характеристиками сохранности вершины или формы и механическими характеристиками. Кроме того, изобретение включает композицию связующего, которая обеспечивает повышение сохранности вершины или формы и улучшение механических характеристик при использовании золя-геля окиси алюминия в качестве абразивных материалов.

УСОВЕРШЕНСТВОВАННЫЙ СПОСОБ ПОЛУЧЕНИЯ ТЕРМОИЗОЛЯЦИОННОГО ПРОДУКТА ИЗ АЭРОГЕЛЯ ДИОКСИДА КРЕМНИЯ С ПОВЫШЕННОЙ ЭФФЕКТИВНОСТЬЮ

АЭРОГЕЛИ, КАЛЬЦИНИРОВАННЫЕ ИЗДЕЛИЯ, ИЗДЕЛИЯ С КРИСТАЛЛИЧЕСКОЙ СТРУКТУРОЙ И СПОСОБЫ ИХ ПОЛУЧЕНИЯ

... 1. Монолитный аэрогель, содержащий органический материал и частицы кристаллического оксида металла, при этом количество частиц кристаллического оксида металла находится в диапазоне от 3 до 20 объемных процентов, исходя из общего объема монолитного аэрогеля, причем, по меньшей мере, 70 мольных процентов кристаллического оксида металла представляют собой ZrO.2. Монолитный аэрогель по п. 1, отличающийся тем, что частицы кристаллического оксида металла содержат в диапазоне от 1 до 15 мольных процентов кристаллического оксида металла, представляющего собой YO.3. Монолитный аэрогель по п. 1, отличающийся тем, что частицы кристаллического оксида металла содержат первое множество частиц, и второе, отличное от него, множество частиц.4. Способ получения не содержащего трещин кальцинированного изделия из оксида металла, имеющего x, y и z размеры, по меньшей мере, 5 мм, плотность в диапазоне от 30 до 95 процентов от теоретической плотности, и средний размер соединенных пор в диапазоне от 10 нм до 100 ...

СПОСОБ ПОЛУЧЕНИЯ КОМПЛЕКСА "ЗОЛЬ-ГЕЛЬ" ПО МЕНЬШЕЙ МЕРЕ ИЗ ТРЕХ СОЛЕЙ МЕТАЛЛОВ И ПРИМЕНЕНИЕ СПОСОБА ДЛЯ ПОЛУЧЕНИЯ КЕРАМИЧЕСКОЙ МЕМБРАНЫ

... 1. Способ получения комплекса "золь-гель" по меньшей мере из трех солей металлов M1, М2, и М3, приемлемых и предназначенных для получения материала типа перовскита, соответствующего общей формуле (I):где:х, у, u и δ являются такими, что сохраняется электронейтральность кристаллической сети;0≤х≤0,9;0≤u≤0,5;(у+u)≤0,5;0≤y≤0,5 и 0<δ;при этом в формуле (I):- А означает атом, выбранный из атомов скандия, иттрия или из группы лантанидов, актинидов или щелочно-земельных металлов;- А′, отличающийся от А, означает атом, выбранный из атомов скандия, иттрия, алюминия, галлия, индия, таллия или из группы лантанидов, актинидов или щелочно-земельных металлов;- В означает атом, выбранный из атомов переходных металлов;- В′, отличающийся от В, означает атом, выбранный из атомов переходных металлов, металлов из группы щелочно-земельных металлов, алюминия, индия, галлия, германия, сурьмы, висмута, олова или свинца;- В″, отличающийся от В и В′, означает атом, выбранный из атомов переходных металлов, металлов ...

ПОЛИКРИСТАЛЛИЧЕСКИЕ АБРАЗИВНЫЕ МАТЕРИАЛЫ И СПОСОБ ИХ ИЗГОТОВЛЕНИЯ

... 1. Способ изготовления поликристаллического абразивного элемента, включающий стадии использования множества сверхтвердых абразивных частиц, обладающих витреофильными поверхностями, нанесения на сверхтвердые абразивные частицы покрытия из материала-предшественника матрицы, обработки обладающих покрытием сверхтвердых абразивных частиц, чтобы сделать их пригодными для спекания, и объединения и спекания обладающих покрытием сверхтвердых абразивных частиц при давлении и температуре, при которых они являются кристаллографически или термодинамически стабильными.2. Способ по п.1, в котором обладающие покрытием сверхтвердые абразивные частицы обрабатывают для превращения материала-предшественника матрицы в оксид, нитрид, карбид, оксинитрид, оксикарбид или карбонитрид материала-предшественника матрицы, или в элементную форму материала-предшественника матрицы, или в их комбинации.3. Способ по п.1, в котором материал-предшественник матрицы представляет собой аморфный или нанокристаллический оксид, ...

Siliciumhaltiges, biologisch degradierbares Material zur anti-inflammatorischen Therapie

Die vorliegende Erfindung betrifft ein siliciumhaltiges, biologisch degradierbares Material zur Prophylaxe und/oder zur Behandlung von Krankheiten, die mit einer erhöhten Interleukin-1 und/oder Interleukin-6 und/oder Interleukin-8 Aktivität einhergehen und/oder die durch Erniedrigung einer solchen bzw. solcher Cytokinaktivität behandelt werden können.

MODIFIZIERTES SOL-GEL ALUMINIUMOXID

Sol-Gel-Verfahren zur Herstellung von keramischen Materialen.

Manufacture of thermoelectric layer for thermal leg of thermoelectric generator, involves subjecting semiconductor material produced using aqueous solution comprising soluble polymer and soluble organic precursor, to sol-gel process

Manufacture of thermoelectric layer involves subjecting semiconductor material produced using aqueous solution comprising soluble polymer and soluble organic precursor, to sol-gel process and forming gel aggregate, then drying and heat-treating.

Keramische Körper auf Basis von mikrokristallinem Aluminiumoxid.

Verfahren zur Herstellung eines Verbundstoffes mit einer Glaskeramik- oder Keramikmatrix durch Sol-Gel-Verfahren und so erhaltener Verbundwerkstoff.

VERFAHREN ZUR HERSTELLUNG EINES PRODUKTS AUF BASIS VON PHOSPHATEN VON THORIUM UND/ODER AKTINID(EN)

TRANSPARANTE, NICHT-GLASARTIGE ZIRKONIUMDIOXID-MIKROKUGELN.

REFRACTORY MATERIAL

Verfahren zur Herstellung von Metallfluorid-Solen und -Gelen

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von Metallfluorid-Solen und -Gelen, umfassend die Schritte: a) Bereitstellen eines Metalls, b) Bereitstellen einer Lösung von Fluorwasserstoff in einem nichtwässrigen Lösungsmittel und c) Umsetzen des Metalls mit der Lösung von Fluorwasserstoff in einem nichtwässrigen Lösungsmittel zur Ausbildung eines Metallfluorid-Sols.

Polycrystalline diamond material

Polycrystalline abrasive constructions

Yttria impregnated porous alumina core

A fired porous alumina-based ceramic core for use in casting metal is impregnated with yttria. Impregnation may be performed by immersion of the fired core in colloidal yttria or in a medium containing a yttria precursor, e.g. solutions containing yttrium salts or yttrium metal-organics such as yttrium acetate, yttrium nitrate, yttrium carbonate or yttrium alkoxide. After impregnation the core is dried. The yttria impregnant preferably accounts for about 1-5 % by weight of the core.

Method for preparing ceramic catalysts

A ceramic catalyst of formula AA'MM'X prepared using sol-gel and ceramic methodologies comprises preparing a sol or slurry in an organic acid, alcohol or water of an alkaline earth metal component (A) preferably barium or strontium; a powdered or liquid transition metal component (M') selected from germanium, lead, silicon, tin, aluminium, gallium, antimony, bismuth or niobium; a powdered metal component (M) wherein M is selected from titanium or zirconium; and X is oxygen/s. The formula may optionally comprise A' selected from samarium or indium; The components are refluxed or mixed together, and the powder is dried and heated with a temperature program to calcination temperatures. The catalyst is for converting methane to higher hydrocarbons by oxidative condensation (or coupling) of methane (OCM). The OCM catalyst may be mixed with a second catalyst of formula NBC/S, for CO2-reforming of methane or dehydrogenation of ethane to ethylene, wherein N is a metal selected from Group IA or ...

Apparatus and methods

SCHUTZÜBERZÜGE AUF KOHLENSTOFFHÄLTIGEN SUBSTRATEN UND VERFAHREN ZUR HERSTELLUNG DERSELBEN

SHORTENED WUNDHEILUNGSPROZESSE OF MEANS OF NEW NON-WOVEN CLOTHS

SINTERED COMPOUND SHARPENING GRAIN, PROCEDURE FOR ITS PRODUCTION AS WELL AS ITS USE

SINTERED COMPOUND GRINDING WHEEL, PROCEDURE FOR ITS PRODUCTION AS WELL AS ITS USE.

TRANSPARENT NOT GLASSLIKE ONES, CERAMIC PARTICLES.

PROCEDURE FOR THE PRODUCTION OF MINERAL DIAPHRAGMS AND POWDERS FROM TITANIUM AND SILICON MIXTURE OXIDES.

PROCEDURE FOR THE PRODUCTION OF CHEMICAL-BOUND SOL-GEL CERAMIC(S)

PROCEDURE FOR THE PRODUCTION ELECTRICALLY OF AN ISOLATION AND MECHANICAL STRUCTURING COVERING ON AN ELECTRICAL CONDUCTOR

SINTER-CASH BODIES AND PROCEDURES FOR THEIR PRODUCTION

Aluminophosphate containing bonding agent for the production of fireproof stones, masses, mortar etc.

SOL-GEL PROCEDURE USING POROUS FORMS

SUPRAMOLEKULARE PRELIMINARY STAGES TO THE PRODUCTION POET CERAMIC(S)

High temperature resistant fibres

Surface preparation of an implant

Method for preparing adjustably bioresorbable sol-gel derived SiO2

The present invention relates to a method for preparing a sol-gel derived Si02 with a very fast bioresorption rate, to bioresorbable sol-gel derived Si02 obtainable by the methods of the invention and to their use in administration of biologically active agents.

Biodegradable material containing silicon, for pro-angiogenetic therapy

The invention relates to a biodegradable material containing silicon, for the prophylaxis and/or treatment of diseases involving reduced and/or disturbed angiogenesis and/or diseases for which an increased angiogenesis rate is required for the healing process.

Monolithic alpha-alumina articles having controlled porosity, and sol-gel process for making them

TITANIUM-CONTAINING MATERIALS

The invention relates to a method of preparing a solution containing particles which contain titanium ions wherein one or more hydrolysable titanium- containing compound(s) is stabilised by oxalic acid in a reaction medium. The reaction further relates to the preparation of titania materials (including particulate materials, coating solutions and films) which comprise or include anatase phase titania, and so are suitable in photocatalytic applications. The invention also deals with a method of preparing B-phase titania.

TRANSPARENT NON-VITREOUS ZIRCONIA MICROSPHERES

METHOD FOR PRODUCING A SILICON CARBIDE-CONTAINING BODY

The present invention relates to a process for producing a silicon carbide-containing body (100), characterized in that the process has the following process steps: a) providing a mixture (16) comprising a silicon source and a carbon source, the silicon source and the carbon source being present together in particles of a solid granular material; b) arranging a layer of the mixture (16) provided in process step a) on a carrier (12), the layer of the mixture (16) having a predefined thickness; and c) treating the mixture (16) arranged in process step b) over a locally limited area with a temperature within a range from = 1400°C to = 2000°C according to a predetermined three-dimensional pattern, the predetermined three-dimensional pattern being selected on the basis of the three-dimensional configuration of the body (100) to be produced. Such a process allows simple and inexpensive production even of complex structures from silicon carbide.

METHODS AND COMPOUNDS FOR CONTROLLING THE MORPHOLOGY AND SHRINKAGE OF SILICA DERIVED FROM POLYOL-MODIFIED SILANES

Siliceous materials are prepared by adding one or more additives, including water soluble polymers, and derivatives thereof, to sols containing tetraalkoxysilanes derived from polyols. The polymers facilitate phase separation of the growing silica gel matrix, leading to high surface area self- supporting silica gels with cure occurring at ambient temperatures. The materials also show a significant reduction in shrinkage properties.

POLYMERISED INORGANIC-ORGANIC PRECURSOR SOLUTIONS

Polymerised inorganic-organic precursor solution obtainable according to a process comprising the steps of (a) forming a solution of at least one metal cation and an organic compound and (b) heating the solution to a temperature between 20 -- 300.degree.C to form a polymerised solution of precursor for nano--sized oxides, and (c) concluding the heating when the room temperature vis-cosity of the solution is from 10 to 500 mPa.cndot.s.

ANTI-ICING COATING FOR POWER TRANSMISSION LINES

Provided are methods and systems for forming piezoelectric coatings on power line cables using sol-gel materials. A cable may be fed through a container with a sol-gel material having a piezoelectric material to form an uncured layer on the surface of the cable. The layer is then cured using, for example, infrared, ultraviolet, and/or other types of radiation. The cable may be suspended in a coating system such that the uncured layer does not touch any components of the system until the layer is adequately cured. Piezoelectric characteristics of the cured layer may be tested in the system to provide a control feedback. The cured layer, which may be referred to as a piezoelectric coating, causes resistive heating at the outer surface of the cable during vibration of the cable due transmission of alternating currents and environmental factors.

BIODEGRADABLE MATERIAL CONTAINING SILICON, FOR PRO-ANGIOGENETIC THERAPY

There is provided a silicon-containing, biodegradable material for use in preventing and/or treating diseases that are associated with reduced and/or disturbed angiogenesis and/or diseases for which an increased rate of angiogenesis is beneficial to the healing process, wherein the silicon-containing, biodegradable material is a polyhydroxysilicic acid ethyl ester compound of the general formula H[OSi8O12(OH)x(OC2H5)6-x]n OH, wherein the silicon-containing, biodegradable material is administered locally, and wherein the diseases are selected from the group of diseases of the blood circulation and/or cardiovascular system such as: anaemia, angina pectoris, arterial occlusive disease, arteriosclerosis, Winiwarter-Buerger disease, myocardial infarction, ischaemia in particular of the heart muscle, of the lung, cardiomyopathy, congestive heart failure, coronary artery diseases such as coronary restenosis, hereditary haemorrhagic telangiectasia, hypercholesterolaemia, ischaemic heart disease ...

Process for the Preparation of Ceramic Flakes, Fibers and Grains from Ceramic Sols

METHOD OF MAKING SOL-GEL MONOLITHS

... 2088500 9202467 PCTABS00010 A method of making a sol-gel monolith, comprising the steps of: a) hydrolyzing and polycondensing one or more oxide percursors to form a sol comprising a plurality of oxide particles suspended in a liquid; b) casting said sol into a mold; c) gelling said sol by cross-linking said oxide particles to form a gel; d) aging said gel to form an aged gel; e) subjecting said aged gel to a drying treatment comprising the steps of: i) heating said aged gel in a high humidity environment; and then ii) heating said aged gel in a low humidity environment to remove liquid from the pores of the aged gel to form a dried, aged gel; and f) densifying said dried, aged gel to form a sol-gel monolith.

CERAMIC PRODUCTS

... 2135292 9323345 PCTABS00028 A method of producing a ceramic product comprising the steps of preparing an aqueous slurry of a silica sol with a refractile material comprising a calcium or zirconium silicate, causing the slurry to gel by physical or chemical means to form a solid structure, and drying said structure to form a porous ceramic product. The product has a high green strength which nevertheless increases on heating, and may be used in building applications.

Method of making a material of a noble metal solid colored.

L’invention concerne un procédé de fabrication d’un matériau comprenant entre 12 et 23 carats d’un métal noble massif de couleur ajustable formé d’un assemblage de nanoparticules contenant un métal noble dans une matrice d’un matériau inorganique, le matériau comprenant au moins 50% en poids du métal noble; le procédé comprenant les étapes de fournir dans un réacteur un mélange comprenant un précurseur de métal noble, par exemple un sel d’or, un précurseur du matériau inorganique, et un solvant incluant de l’eau, un solvant alcoolique, et un solvant aprotique polaire; et chauffer ledit mélange à une première température de manière à réduire le précurseur de métal noble. Le mélange comprend entre 5 et 20%vol d’eau; entre 40 et 60%vol du solvant aprotique polaire, entre 25 et 50%vol du solvant alcoolique; et entre 50 et 100 g du précurseur de métal noble. Le matériau ainsi fabriqué trouve son application dans des domaines aussi variés que l’horlogerie, la bijouterie, la cosmétique ou le domaine ...

Method of making a material of a noble metal solid colored.

L’invention concerne un procédé de fabrication d’un matériau comprenant entre 12 et 23 carats d’un métal noble massif coloré, formé d’un assemblage de nanoparticules contenant un métal noble dans une matrice d’un matériau inorganique, le matériau comprenant au moins 50% en poids du métal noble; le procédé comprenant les étapes de: fournir dans un réacteur un mélange comprenant un précurseur de métal noble (S3), par exemple un sel d’or, un précurseur du matériau inorganique, et un solvant incluant de l’eau (S1), un solvant alcoolique, et un solvant aprotique polaire (S2); chauffer ledit mélange à une première température, jusqu’au reflux, de manière à réduire le précurseur de métal noble (S3); refroidir le mélange à une seconde température inférieure à la première température de manière à obtenir une suspension; et filtrer la suspension. Le mélange comprend entre 5 et 20%-vol d’eau; entre 40 et 60%-vol du solvant aprotique polaire, entre 25 et 50%-vol du solvant alcoolique. Et entre 50 et ...

СПЕЧЕННЫЙ ШАР НА ОСНОВЕ ДИОКСИДА ЦИРКОНИЯ И ОКСИДА ЦЕРИЯ

Спеченный шар, демонстрирующий следующие данные химического анализа (мас.%) при условии, что общая сумма составляет 100%: ZrO2+HfO2=78-85%; CeO2=15%; Al2O3 > 0,1%; добавка > 0,1%; примеси < 1%; где добавка выбрана из MnO, MnO2, Fe2O3, CuO, TiO2, Y2O3, Sb2O3, ZnO и их смесей. Применение в области микроизмельчения и микродисперсии.

СПЕЧЕННЫЙ ШАР НА ОСНОВЕ ДИОКСИДА ЦИРКОНИЯ И ОКСИДА ЦЕРИЯ

Спеченный шар, демонстрирующий следующие данные химического анализа в мас.% при условии, что общая сумма составляет 100%: ZrO2 + HfO2 = 78-85%; CeO2 = 15%; Al2O2 >0,1%; добавка: >0,1%; примеси: <1%; где добавка выбрана из MnO, MnO2, Fe2O3, CuO, TiO2, Y2O3, Sb2O3, ZnO и их смесей. Применение в области микроизмельчения и микродисперсии.

PARTICLES PROPPING FILLER, OBTAINED FROM DROPS SUSPENSION, AND METHODS OF USING

Preparation method of aluminium oxide-silicon carbide high temperature ceramic material

Herbst bremer goldschlaegerei

Ceramic corundum abrasive with micro flake interlocked structure

Segmented gel composites and rigid panels manufactured therefrom

INORGANIC MATERIAL HAS STRUCTURE HIERARCHISEE, AND PROCEEDED FOR SA PREPARATION

METHOD FOR PREPARING AN ELECTROCHEMICAL HALF-CELL

PART OF COMPOSITE MATERIAL

La présente invention concerne une pièce en matériau composite comprenant au moins : - un renfort fibreux comprenant des fibres de carbure de silicium présentant une teneur en oxygène inférieure ou égale à 1% en pourcentage atomique, et - une matrice présente dans la porosité du renfort fibreux et comprenant au moins un silicate de terre rare, de la mullite ou un mélange de mullite et d'au moins un silicate de terre rare.

DEVICE OF THERMISTOR, METHOD OF MANUFACTURE OF THERMISTORS AND TEMPERATURE GAUGE

La présente invention concerne un dispositif de thermistance comportant un corps fritté mixte de (M1M2) O3 . Al2O3 consistant en du (M1M2) O3 et du Al2O3 , dans lequel M1 est au moins un ou plusieurs éléments sélectionnés parmi les éléments du Groupe 2A ou du Groupe 3A du Tableau Périodique des Eléments, à l'exception de La, et M2 est au moins un ou plusieurs éléments sélectionnés parmi les éléments du Groupe 2B, du Groupe 3B, du Groupe 4A, du Groupe 5A, du Groupe 6A, du Groupe 7A ou du Groupe 8 du Tableau Périodique. Ce type de dispositif de thermistance est particulièrement bien adapter pour les capteurs de températures stables pour des mesures de température entre la température ambiante et 1000°C.

CERAMIC MATTER CONTAINING PHOSPHATE OF CALCIUM POROUS AND PROCEEDED OF PRODUCTION

CERAMIC COMPOSITE MULTILAYER FIBER-MATRIX AND METHOD FOR ITS PREPARATION.

Manufacturing lithium titanate micro sintering grain, involves dispersing lithium, titanium in an aqueous binder solution, dropping liquid in bath containing polyvalent metal, drying grains, calcinating, sintering

L'invention concerne un procédé de production de granules frittés de titanate de lithium en partant d'un produit de départ pulvérisé contenant du lithium et du titane. Il comprend les étapes consistant à : préparer (S101) une dispersion dudit produit de départ pulvérisé dans une solution aqueuse de liant contenant un sel d'acide alginique, qui peut former un gel lorsque du contact de ce sel et d'ions métalliques polyvalents; former (S102) des gouttes de la dispersion en la versant goutte à goutte à travers une buse; immerger (S103) lesdites gouttes dans un bain liquide qui contient des ions métalliques polyvalents pour gélifier ladite solution, en formant ainsi des particules sphériques humides de gel dans lesquelles le produit de départ pulvérisé est dispersé; sécher (S105) lesdites particules humides sphériques de gel; les calciner (S106) après séchage afin d'en enlever le métal polyvalent, en obtenant ainsi des particules sphériques de titanate de lithium; et fritter (S107) ces particules ...

PROCESS FOR THE PREPARATION OF A MATERIAL ON A SUBSTRATE BY A SOL-GEL ROUTE

HYBRID NANOFIBRES ORGANIQUES-INORGANIQUES HAVE INORGANIC PHASE MESOPOREUSE, THEIR PREPARATION BY EXTRUSION ELECTRO-ASSISTEE, MEMBRANE, ELECTRODE, AND COMBUSTIBLE BATTERY.

Nanofibres hybrides organiques-inorganiques comprenant deux phases : - une première phase minérale comprenant un réseau mésoporeux structuré à porosité ouverte ; et - une deuxième phase organique comprenant un polymère organique, ladite phase organique n'étant essentiellement pas présente à l'intérieur des pores du réseau mésoporeux structuré. Membrane et électrode comprenant lesdites nanofibres. Pile à combustible comprenant ladite membrane et/ou ladite électrode. Procédé de préparation desdites nanofibres par extrusion électro-assistée.

COMPLEX CERAMIC PREPARED BY USING SOL-GEL METHOD, COATING MATERIAL FOR THIN FILM HAVING HEAT-RESISTANCE TO ULTRA-HIGH TEMPERATURE AND HIGH RESISTANCE TO CORROSION COMPRISING THE SAME AND METHOD THEREOF

POROUS CALCIUM PHOSPHATE CERAMIC AND METHOD FOR PRODUCING SAME

Concrete Polishing Penetration Type Ceramic Strengthening Agent and Ceramic Coating Construction Method

METHOD FOR MANUFACTURING OXIDE POWDER HAVING PEROVSKITE STRUCTURE AND OXIDE POWDER MANUFACTURED BY SAME

A method for manufacturing an oxide powder having a perovskite structure according to the present invention comprises the following steps: preparing a metal precursor solution by mixing ethanol with a lanthanide metal precursor, a barium (Ba) precursor, a cobalt (Co) precursor, and a copper (Cu) precursor; performing a sol-gel reaction by mixing an ethylenediaminetetraacetic acid (EDTA) solution containing EDTA and ammonia water, the metal precursor solution and citric acid; drying a gelled compound formed by a sol-gel reaction; and calcining the dried compound. According to the method for manufacturing an oxide powder having a perovskite structure according to the present invention, it is possible to remarkably shorten the time required for gelation in a sol state, minimize the size of particles formed at the beginning to be controlled to the particle size of 50 nm or less. COPYRIGHT KIPO 2017 ...

형상화 연마입자들 및 이의 형성방법

... 형상화 연마입자 형성방법은 인가 구역 내에서 혼합물을 형상화 조립체 내부로 인가하는 단계 및 토출재를 형상화 조립체에 있는 혼합물에 예정된 힘으로 분사하고, 형상화 조립체로부터 혼합물을 제거하고 형상화 연마입자 전구체를 형성하는 단계로 구성된다.

METHOD OF MAKING CERAMIC SHAPED ABRASIVE PARTICLES, SOL-GEL COMPOSITION, AND CERAMIC SHAPED ABRASIVE PARTICLES

LaNiO3 thin film-forming composition and method of forming LaNiO3 thin film using the same

A LaNiO3 thin film having extremely few voids is uniformly formed. Provided is a LaNiO3 thin film-forming composition for forming a LaNiO3 thin film. It includes: a LaNiO3 precursor; a first organic solvent; a stabilizer; and a second organic solvent. The first organic solvent includes carboxylic acids, alcohols, esters, ketones, ethers, cycloalkanes, aromatic compounds, or tetrahydrofuran. The stabilizer includes [beta]-diketones, [beta]-ketones, [beta]-keto esters, oxyacids, diols, triols, carboxylic acids, alkanolamines, or polyvalent amines. The second organic solvent has a boiling point of 150 DEG C to 300 DEG C and a surface tension of 20 to 50 dyn/cm. The LaNiO3 precursor content is 1 to 20 mass% with respect to 100 mass% of the composition. The stabilizer content is 0 to 10 mol with respect to 1 mol of a total amount of the LaNiO3 precursors. The second organic solvent content is 5 to 20 mass% with respect to the composition.

SHORTENED WOUND HEALING PROCESSES BY MEANS OF NOVEL FIBER NON-WOVENS

Sinterable structures and method

A method of producing an open, porous structure having an outer surface defining a shape having a bulk volume and having interconnecting openings extending throughout said volume and opening through said surface, and products resulting from the method. The method comprises preparing a viscous mixture comprising a sinterable powder dispersed in a sol of a polymer in a primary solvent, replacing the primary solvent with a secondary liquid in which the polymer is insoluble to produce a gel comprising an open polymeric network having the sinterable powder arranged therein, removing the secondary liquid from the gel; removing the polymer network, and sintering the sinterable powder to form the open, porous structure. Also disclosed are shaped, porous products resulting from methods of the invention.

METHOD FOR PRODUCING HOLLOW BODIES HAVING ENCLOSED FREELY DISPLACEABLE PARTICLES

The invention relates to a method for producing hollow bodies having freely displaceable particles enclosed in the hollow body, wherein a) a gel-forming liquid in which the particles are suspended is brought into a cross-linking bath, b) the gel cores that form are isolated, c) the cores are coated with a composition comprising sinterable material and a binder, and d) the coated cores are subjected to a heat treatment wherein the gel and the binder are expunged and the sinterable material is sintered into a closed shell. The gel forming material is, for example, sodium alginate, and the cross-linking bath comprises calcium ions. The particles are selected, for example, from ZrO2, AI2O3, TiO2, and SiO2 or mixtures thereof. The sinterable material is, for example, a metal powder such as carbonyl iron powder.

PROCESSES FOR NIOBIUM OXIDE EXTRUSION CASTING OR CONFORMATION AND PREPARATION OF A HYDROLIZED AND AMORPHOUS NIOBIUM OXIDE AND USE OF A NIOBIUM OXIDE IN THE EXTRUDED FORM

The invention relates to a process for extrusion casting or conformation of a niobium oxide, in which the extruded profile is obtained by means of drying and calcination, in appropriate conditions, of a green extruded profile, which is obtained by extrusion casting of a niobium oxide viscous gel. The invention also relates to a process for preparation of a hydrolyzed and amorphous niobium oxide, in which the hydrolyzed and amorphous niobium oxide is synthesized from organic or inorganic niobium precursors. At last, the invention relates to uses of a niobium oxide in the extruded form.

LEAD-FREE PIEZOCERAMIC MATERIAL COMPRISING THE MIXED SYSTEM OF ALKALINE EARTH PEROVSKITE AND BISMUTH METAL OXIDE, AND METHOD FOR PRODUCING SAID MATERIAL

The invention relates to a piezoceramic material comprising a binary mixed system of an alkaline earth perovskite ABO3 and a bismuth oxide BiMO3, wherein A is at least one alkaline earth metal, B is at least one element of the fourth main group and/or the fourth subgroup of the periodic system, M is an element selected from the group including scandium, ytterbium and indium, a perovskite portion of the alkaline earth perovskite of the binary mixed system is selected at a percentage ranging from 33%, inclusive, to 66%, inclusive, and a bismuth oxide portion of the bismuth oxide is selected at a percentage ranging from 66%, inclusive, to 33%, inclusive. The invention also relates to a method for producing a piezoceramic starting material. Said method comprises the following steps: a) providing a piezoceramic starting composition of the piezoceramic material and b) heat-treating the piezoceramic material, the result being the piezoceramic material. The invention allows the wet-chemical and ...

SYSTEM AND METHOD FOR PRODUCTION OF MEMBRANE

System and method for production of membrane having high strength, enhanced thermal stability and chemical resistance comprising of at least two furnace plates, at least one heating coils encased in ceramic disc housing, metal sheet and base. Perforated ceramic discs of the invention are mounted on a movable stand and equipped with heating mantle, insulation and is encased in a metallic cover. The pores present on ceramic disc not only helps in dissipation of gases emanating from heating of wet metal oxide gel diaphragms but also conducts the heat from heating coil to it. The pores in the ceramic disc plays dual role i.e. exit of trapped water and other organic matter as well as entry of heat towards the wet gel films for faster drying. On the other hand the perforated ceramic disc has a major role to play in preventing the deformation likely to occur during sintering of semidried metal oxide gel diaphragms by putting a vertical pressure and controlling its morphology as the heating progresses ...

POROUS BODY AND METHOD FOR PRODUCING SAME

Disclosed is a porous body having a solid skeleton and pores wherein the solid skeleton is composed of inorganic oxide particles connected in a network form. The inorganic oxide has an organically modified skeleton. When compared with conventional dried gels formed by sol-gel methods, this porous body is more excellent in moisture resistance, solvent resistance and further in impact resistance.

Method for preparing support of molecular sieve membrane

A method for preparing a support of a molecular sieve membrane is provided and relates to a technical field of support preparation, including steps of: according to a molar ratio of magnesium, aluminum and silicon in cordierite, preparing a nanometer composite sol of magnesium, aluminum, silicon and lanthanum serving as a sintering aid through a sol-gel method, enveloping and bonding the sol on a surface of dispersed nano-sized cordierite powders, and transforming the sol into nanometer composite oxides through presintering; mixing the cordierite powders, a binder and water, forming mud, extruding the mud, forming the mud into a green body, and sintering the green body into a cordierite support; coating a layer of film on the cordierite support with an aqueous dispersant of zirconia, then sintering, and obtaining a support of a molecular sieve membrane, composited by a cordierite main support layer and a zirconia film layer.

Precursor composition, method of manufacturing precursor composition, inkjet coating ink, method of manufacturing ferroelectric film, piezoelectric device, semiconductor device, piezoelectric actuator, inkjet recording head, and inkjet printer

A precursor composition including a precursor for forming a ferroelectric, the ferroelectric being shown by a general formula AB1-XCXO3, an element A including at least Pb, an element B including at least one of Zr, Ti, V, W, and Hf, an element C including at least one of Nb and Ta, the precursor including at least the element B and the element C and part of the precursor including an ester bond, the precursor being dissolved or dispersed in an organic solvent, and the organic solvent including at least a first alcohol and a second alcohol having a boiling point and viscosity higher than a boiling point and viscosity of the first alcohol.

Process for producing finely divided powdery metal oxide compositions

A finely divided metal oxide powdery composition, preferably with a narrow particle size distribution, is produced from a particulate, sol-gel derived composition containing agglomerates by heating the particulate composition in the presence of an effective amount of a composition which decomposes upon heating and forms a gas to break at least a portion of the agglomerates so as to yield the desired finely divided ceramic particle composition. Examples of suitable gas-forming agents for use in the present invention include the ammonium salts or amides of organic and inorganic acids, volatile acids, and gases dissolved in a suitable solvent, such as water, alcohol or ammonia.

Slurry for making ceramic insulation

A fibrous ceramic mat is molded from a slurry of ceramic fibers and/or ceramic microparticles and/or a metal. The mat is impregnated with a sol prior to drying. A catalyst for the sol is introduced into the mat to cause the sol to gel. The sol-gel binder forms bonds so that the mat is dimensionally stabilized. The mat is dried to produce the desired ceramic insulation that has preferably a consistent microstructure and a fully gelled sol-gel binder through its entire thickness. When a metal is used, it corrodes (i.e., oxidizes) or otherwise reacts to form a refractory binder that augments the sol and reduces the need to infuse sol incrementally to achieve strength. Using metal powder significantly reduces the cost of manufacture.

Ceramic dielectric or thin and/or thick layers containing at least one ceramic dielectric method for production and use thereof

The present invention relates to dielectric ceramics, thin and/or thick layers produced therefrom and a method for the production thereof and the use of the dielectrics and of the thin and/or thick layers.

Titanium carbide powder and titanium carbide-ceramics composite powder and method for production thereof, and sintered compact from the titanium carbide powder and sintered compact from the titanium carbide/ceramics composite powders and method for production thereof

Disclosed is a highly-pure fine titanium carbide powder having a maximum particle size of 100 nm or less and containing metals except titanium in an amount of 0.05 wt % or less and free carbon in an amount of 0.5 wt % or less. The powder has a NaCl-type crystal structure, and a composition represented by TiCxOyNz, wherein X, Y and Z satisfy the relations: 0.5X1.0; 0Y0.3; 0Z0.2; and 0.5X+Y+Z1.0.) The powder is produced by: dissolving an organic substance serving as a carbon source in a solvent to prepare a liquid, wherein the organic substance contains at least one OH or COOH group which is a functional group coordinatable to titanium of titanium alkoxide, and no element except C, H, N and O; mixing titanium alkoxide with the liquid to satisfy the following relation: 0.71.0 (wherein is a molar ratio of the carbon source to the titanium alkoxide), so as to obtain a precursor solution; and subjecting a product in the precursor solution to a heat treatment in a non-oxidizing atmosphere or a ...

Sol-gel process for making monolithic alpha-alumina articles having controlled porosity

Disclosed is a sol-gel process for making high-density monolithic alpha-alumina articles. Cracking problems caused by shrinkage of the gel during the drying and firing stages are minimized by controlling the temperature and humidity during the drying process and by using molds formed of prescribed polymeric materials, preliminarily coated with a silicone release agent. The process of the invention provides porous alpha-alumina articles having a controlled microstructure and a controlled pore size distribution, which are beneficial features when the material is used in practical applications, e.g., as substrates for gas sensors.

Ceramic membrane having a catalytic membrane-material coating

A porously coated, densely sintered ceramic membrane, which can be produced from a green membrane and subsequent sintering. The membrane is coated with ceramic material, which contains noble metals, which can be produced by application and subsequent thermal treatment. The noble metals are contained at a concentration of 2.5 to 5 mass percent.

Systems and methods for making monolithic gel bodies

Systems and methods for making a monolithic gel body. Some systems can include a substrate, a sol, an ammonia atmosphere. Some methods can include applying a first quantity of the sol to the substrate to form a first coated substrate, and positioning the first coated substrate in the ammonia atmosphere to cure the first quantity of sol to form a first supported gel comprising a first gel supported by the substrate. Such methods can further include applying a second quantity of the sol to the first supported gel to form a second coated substrate comprising the second quantity of sol and the first supported gel. Some methods can include positioning the substrate in the ammonia atmosphere while applying the sol onto the substrate to form a monolithic gel body by a layering process.

Metal surfaces comprising a thin glass- or ceramic type protective layer having high chemical resistance and improved non-stick properties

The invention relates to articles comprising a metal surface provided with a glass-, glass-ceramic- or ceramic-type protective layer, characterized in that the protective layer comprises a base layer comprising a matrix made of an alkali and/or alkaline earth silicate and an alkali metal- and alkaline earth metal-free top layer comprising a matrix made of an oxidic silicon compound, and to a method for the manufacture of said articles. The articles comprising the protective layer exhibit high chemical resistance and improved non-stick properties. They are characterized in particular by high dishwasher resistance.

Biodegradable material containing silicon, for pro-angiogenetic therapy

The present invention relates to a silicon-containing, biodegradable material for preventing and/or treating diseases that are associated with reduced and/or disturbed angiogenesis and/or diseases for which an increased rate of angiogenesis is beneficial to the healing process.

Ceramic powder and multi-layer ceramic capacitor

A ceramic powder that contains, as a main composition, barium titanate powder having a perovskite structure with an average particle size (median size) of 200 nm or smaller as measured by SEM observation, wherein the barium titanate powder is such that the percentage of barium titanate particles having twin defects in the barium titanate powder is 13% or more as measured by TEM observation and that its crystal lattice c/a is 1.0080 or more. The ceramic powder has a wide range of optimum sintering temperatures and thus offers excellent productivity and is particularly useful in the formation of thin dielectric layers of 1 μm or less.

Organic-inorganic hybrid nanofibres having a mesoporous inorganic phase, preparation thereof by electrospinning, membrane, electrode, and fuel cell

Organic-inorganic hybrid nanofibres comprising two phases: a first mineral phase comprising a structured mesoporous network with open porosity; and a second organic phase comprising an organic polymer, wherein said organic phase is basically not present inside the pores of the structured mesoporous network. A membrane and an electrode comprising said nanofibres. A fuel cell comprising said membrane and/or said electrode. A method of preparing said nanofibres by electrically assisted extrusion (electrospinning).

Alumina composite, method for manufacturing alumina composite, and polymer composition containing alumina composite

For the purpose of producing an alumina composite in which the integrity between alumina and an inorganic material is further improved, a dispersion liquid preparation step, a solidification step and a burning step are performed, wherein the dispersion liquid preparation step comprises preparing a dispersion liquid in which an inorganic material such as a carbon material is homogeneously dispersed in an alumina raw material solution having an organic additive dissolved therein, the solidification step comprises drying the dispersion liquid to produce a solid raw material, and burning step comprises burning the solid raw material in a non-acidic atmosphere while contacting hydrogen chloride with the solid raw material. In this manner, an alumina composite can be produced, in which at least a portion of an inorganic material such as a carbon material is embedded in the inside of each of α-alumina single crystal particles the constitute alumina particles.

METHOD OF MANUFACTURING PEROVSKITE POWDER, PEROVSKITE POWDER MANUFACTURED BY THE SAME AND MULTILAYER CERAMIC ELECTRONIC COMPONENT

There are provided a method of manufacturing perovskite powder, and perovskite powder and a multilayer ceramic electronic component manufactured thereof. The manufacturing method includes: washing metal oxide hydrate to remove impurities therefrom; adding pure water and an acid or a base to the metal oxide hydrate to prepare a metal oxide sol; mixing the metal oxide sol with a metal salt to form perovskite particle nuclei; and conducting grain growth of the perovskite particle nuclei by hydrothermal treatment to produce perovskite powder. The method of manufacturing perovskite powder and the perovskite powder manufactured by the same have advantages such as excellent crystallinity, reduced generation of fine powder, and favorable dispersion properties. 1. A method of manufacturing perovskite powder , the method comprising:washing metal oxide hydrate to remove impurities therefrom;adding pure water and an acid or a base to the metal oxide hydrate to prepare a metal oxide sol;mixing the metal oxide sol with a metal salt to form perovskite particle nuclei; andconducting grain growth of the perovskite particle nuclei by hydrothermal treatment to produce perovskite powder.2. The method of manufacturing pervoskite powder of claim 1 , wherein the metal oxide sol has a degree of transmittance of more than 50%.3. The method of manufacturing perovskite powder of claim 1 , wherein the metal oxide sol has a particle size of less than 10 nm.4. The method of manufacturing perovskite powder of claim 1 , wherein the perovskite powder is at least one selected from a group consisting of BaTiO claim 1 , BaTiZrO claim 1 , BaYTiO claim 1 , BaDyTiOand BaHoTiO(0 Подробнее

Zirconia-based material doped with yttrium and lanthanum

Sintered bodies containing zirconia-based ceramic materials and partially sintered bodies that are intermediates in the preparation of the sintered bodies are described. The zirconia-based ceramic material is doped with lanthanum and yttrium. The grain size of the zirconia-based ceramic material can be controlled by the addition of lanthanum. The crystalline phase of the zirconia-based ceramic material can be influenced by the addition of yttrium.

GRAPHENE MACRO-ASSEMBLY-FULLERENE COMPOSITE FOR ELECTRICAL ENERGY STORAGE

Disclosed here is a method for producing a graphene macro-assembly (GMA)-fullerene composite, comprising providing a mixture of graphene oxide and water, adding a hydroxylated fullerene to the mixture, and forming a gel of the hydroxylated fullerene and the mixture. Also described are a GMA-fullerene composite produced, an electrode comprising the GMA-fullerene composite, and a supercapacitor comprising the electrode. 1. A method for producing a graphene macro-assembly (GMA)-fullerene composite , comprising:providing graphene oxide;adding a hydroxylated fullerene compound to the graphene oxide; andperforming a gelation process using the graphene oxide and the hydroxylated fullerene.2. The method of claim 1 , wherein providing the graphene oxide comprises providing a water suspension of graphene oxide.3. The method of claim 2 , wherein the water suspension of graphene oxide comprises a mixture of at least about 7 mg of graphene oxide in 1 mL of water.4. The method of claim 1 , wherein the hydroxylated fullerene compound comprises a Chydroxylated fullerene claim 1 , a Chydroxylated fullerene claim 1 , or a Chydroxylated fullerene.5. The method of claim 1 , wherein adding the hydroxylated fullerene compound comprises adding about 5 mg of water soluble C(OH)to the graphene oxide claim 1 , the graphene oxide comprising a mixture of about 20 mg of graphene oxide in 1 mL of water.6. The method of claim 1 , further comprising sonicating the hydroxylated fullerene and the graphene oxide.7. The method of claim 1 , further comprising adding claim 1 , to about 1 g of a suspension formed from the hydroxylated fullerene compound and the graphene oxide claim 1 , about 211 μL of ammonium hydroxide solution to form a mixture claim 1 , wherein performing the gelation process comprises performing the gelation process using the mixture.8. The method of claim 1 , wherein performing the gelation process comprises performing the gelation process at about 80° C. for about 72 hours.9. The ...

IMPROVED PROCESS FOR PRODUCING SILICA AEROGEL THERMAL INSULATION PRODUCT WITH INCREASED EFFICIENCY

The invention relates to an improved method for producing silica aerogel in pure and flexible sheet form having effective suppression of radiative heat transport at high temperatures and increased thermal insulation property. The suppression of radiative heat transport was achieved by in-situ production of titanium dioxide nanoparticles in very minor concentrations during gelation of silica precursor, with nanoporous surface area more than 300 m2/g and acts as an infra red reflecting agent. When aerogel is subjected to heat during hot object insulation, it automatically turn into infra red reflecting material. Said silica aerogel can be incorporated into the inorganic fibre mat matrix individually or into two or more layers with organic sponge sheet placed in between and stitched together to form a sandwich sheet to form highly insulating flexible sheet. 118.-. (canceled)19. A method for preparation of a silica aerogel thermal insulation product , the method comprising:(a) preparing a hydro-alcoholic solution containing at least one alkali;(b) adding a solution of a metal oxide precursor to the hydro-alcoholic solution to form a dispersion effecting in-situ formation and precipitation of nanoparticles of at least one metal oxide, wherein the metal oxide precursor comprises one or more metals selected from the group consisting of iron, manganese, magnesium, zirconium, zinc, chromium, cobalt, titanium, tin, and indium;(c) mixing at least one silica precursor with the dispersion to form a first mixture;(d) stirring the first mixture to obtain a viscous mixture with the nanoparticles entrapped therewithin;(e) aging the viscous mixture to form an aged viscous mixture; and(f) effecting supercritical drying of the aged viscous mixture, to obtain the silica aerogel thermal insulation product.20. The method of claim 19 , wherein the at least one silica precursor is selected from the group consisting of tetraethylorthosilicate claim 19 , tetramethylorthosilicate claim 19 , ...

NON-RESPIRABLE, POLYCRYSTALLINE, ALUMINOSILICATE CERAMIC FILAMENTS, FIBERS, AND NONWOVEN MATS, AND METHODS OF MAKING AND USING THE SAME

A nonwoven web including a multiplicity of non-respirable, polycrystalline, aluminosilicate ceramic filaments entangled to form a cohesive mat, the polycrystalline, aluminosilicate ceramic filaments having an average mullite percent of at least 75 wt. %. The cohesive mat preferably exhibits a compression resilience after 1,000 cycles at 900° C. when measured according to the Fatigue Test, of at least 30 kPa. Insulation articles including the cohesive mats or formed by chopping the ceramic mats into ceramic fibers, pollution control devices including the insulation articles, and methods of making the non-respirable, polycrystalline, aluminosilicate ceramic filaments and fibers, nonwoven webs, insulation articles, and pollution control devices, are also described. 1. A nonwoven article , comprising:a plurality of non-respirable, polycrystalline, aluminosilicate ceramic filaments entangled to form a cohesive nonwoven mat, wherein the aluminosilicate ceramic filaments have an average mullite percent of at least 75 wt. %, optionally wherein the cohesive mat exhibits a compression resilience of at least 30 kPa after 1,000 cycles at 900° C. when measured according to the Fatigue Test using the open gap setting.2. The nonwoven article of claim 1 , wherein each of the plurality of non-respirable claim 1 , polycrystalline claim 1 , aluminosilicate ceramic filaments exhibits a diameter of at least 3 micrometers as determined using the Filament Diameter Measurement Procedure with electron microscopy.3. The nonwoven article of claim 1 , wherein the plurality of non-respirable claim 1 , polycrystalline claim 1 , aluminosilicate ceramic filaments exhibit at least one of a Process Capability Index (Cpk) for fiber diameters greater than three micrometers of at least 1.33 claim 1 , or a Process Performance Index (Ppk) for fiber diameters greater than three micrometers of at least 1.33 claim 1 , as determined using the Filament Diameter Measurement Procedure with electron microscopy.4 ...

PRODUCTION OF LEAD-FREE PIEZOCERAMICS IN AQUEOUS SURROUNDINGS

The invention relates to a method for producing ceramics having piezoelectric properties in predominantly aqueous suspending agents. 1. A method for producing a ceramic having piezoelectric properties , wherein predominantly aqueous suspending agents are used.2. The method for producing a ceramic having piezoelectric properties according to claim 1 , wherein claim 1 , in a first method step claim 1 , the raw materials are mixed in predominantly aqueous suspending agents and are milled claim 1 , wherein a suspension having isotropic distribution is created.3. The method for producing a ceramic having piezoelectric properties according to claim 2 , wherein the isotropic distribution of the suspension is fixed in the subsequent method step.4. The method for producing a ceramic having piezoelectric properties according to claim 3 , wherein the fixing of the isotropic distribution takes place by freezing of the suspension.5. The method for producing a ceramic having piezoelectric properties according to claim 4 , wherein the freezing takes place in a liquid claim 4 , solid or gaseous freezing medium.6. The method for producing a ceramic having piezoelectric properties according to claim 5 , wherein the temperature of the freezing medium is below the melting temperature of the suspension claim 5 , and preferably far below the melting temperature.7. The method for producing a ceramic having piezoelectric properties according to claim 6 , wherein the suspension is flash-frozen.8. The method for producing a ceramic having piezoelectric properties according to claim 5 , wherein the freezing medium is selected from the group consisting of liquid or gaseous nitrogen claim 5 , liquid or gaseous air claim 5 , liquid or gaseous oxygen claim 5 , or other liquid or gaseous organic or inorganic media.9. The method for producing a ceramic having piezoelectric properties according to claim 4 , wherein the freezing takes place by way of injection into a freezing medium claim 4 , whereby ...

Method For Preparing A Sol-Gel Solution Which Can Be Used For Preparing A Barium Titanate Ceramic Doped With Hafnium And/or With At Least One Lanthanide Element

The invention relates to a method for preparing a sol-gel solution which can be used to prepare a barium titanate ceramic doped with hafnium and/or with at least one lanthanide element, comprising the following steps: 1. A method for preparing a sol-gel solution which can be used to prepare a barium titanate ceramic doped with hafnium and/or with at least one lanthanide element , comprising the following steps:a) a step to place a first mixture comprising a barium carboxylate and a diol solvent in contact with a second mixture comprising a titanium alkoxide and a hafnium alkoxide and/or an alkoxide of a lanthanide element in a monoalcohol solvent;b) a step to distil the mixture resulting from step a) to remove at least part of the monoalcohol solvent; andc) a step to add acetic acid, under heat, to the distilled mixture of step b).2. The method according to claim 1 , wherein the barium titanate ceramic is doped solely with hafnium claim 1 , wherein the second mixture comprises a titanium alkoxide and a hafnium alkoxide.4. The method according to claim 1 , wherein the barium carboxylate is barium acetate of formula (CHCOO)Ba.5. The method according to claim 1 , wherein the diol solvent is an alkylene glycol having a number of carbon atoms ranging from 2 to 5.7. The method according to claim 1 , wherein the hafnium alkoxide and titanium alkoxide are hafnium isopropoxide and titanium isopropoxide respectively.8. The method according to claim 1 , wherein the monoalcohol solvent is an aliphatic monoalcohol solvent having 1 to 6 carbon atoms.9. The method according to claim 1 , wherein the monoalcohol solvent has the same number of carbon atoms as each alkoxy ligand (RO) of the alkoxides of formulas (II) and (III) defined in .11. The method according to which claim 1 , after step c) claim 1 , further comprises the following steps:d) a step to agitate the sol-gel solution obtained at step c); ande) a step to dilute the sol-gel solution resulting from step d) in a ...

METHOD OF MAKING CERAMIC SHAPED ABRASIVE PARTICLES, SOL-GEL COMPOSITION, AND CERAMIC SHAPED ABRASIVE PARTICLES

A method includes: providing a mold having a plurality of mold cavities, wherein each mold cavity is bounded by a plurality of faces joined along common edges; filling at least some of the mold cavities with a sol-gel composition that includes a release agent dispersed therein; at least partially drying the sol-gel composition thereby forming shaped ceramic precursor particles; calcining at least a portion of the shaped ceramic precursor particles to provide calcined shaped ceramic precursor particles; and sintering at least a portion of the calcined shaped ceramic precursor particles to provide ceramic shaped abrasive particles. A sol-gel composition, shaped ceramic precursor particles, and ceramic shaped abrasive particles associated with practice of the method are also disclosed. 1. A sol-gel composition comprising a liquid vehicle and a ceramic precursor , the liquid vehicle comprising a volatile component and a release agent dispersed throughout the volatile component , wherein the sol-gel composition comprises a sol-gel , wherein the release agent comprises an oil , and wherein the ceramic precursor can be converted to alpha alumina.2. The sol-gel composition of claim 1 , wherein the release agent is included in the sol-gel composition in an amount of from 0.08 to 4.25 percent of the theoretical oxide weight of the ceramic precursor.3. Shaped ceramic precursor particles claim 1 , wherein each shaped ceramic precursor particle comprises a ceramic precursor that can be converted into alpha alumina and is bounded by a surface having a plurality of faces joined along common edges claim 1 , wherein the surface has voids on at least a portion thereof claim 1 , wherein the voids are shaped as hollow ellipsoidal sections claim 1 , wherein the plurality of faces comprises:an exposed face having a portion of the voids thereon, wherein the exposed face has a first density of the voids; anda mold face, wherein the mold face has a portion of the voids thereon, wherein the ...

PERFORMANCE OF TECHNICAL CERAMICS

Disclosed herein are a ceramic particle comprising a ceramic core substrate and a conformal coating of a sintering aid film on a surface of the core substrate, wherein the conformal coating includes a plurality of distributed islands of the sintering aid film across the surface of the core substrate; methods for producing the ceramic particle by ALD or MLD; and methods of using the coated ceramic particles in additive manufacturing or in solid oxide fuel cells. In one example, the film may have a thickness of less than three nanometers. The disclosed ceramic particle may be non-reactive with water. 1. A ceramic particle comprising:a core substrate chosen from yttria-stabilized zirconia, partially stabilized zirconia, zirconium oxide, aluminum nitride, silicon nitride, silicon carbide, boron carbide, boron nitride, aluminum oxide, barium titanate, and cerium oxide, anda conformal coating of a sintering aid film on a surface of the core substrate, wherein the conformal coating of the sintering aid film comprises a plurality of distributed islands of the sintering aid film across the surface of the core substrate.2. The ceramic particle of claim 1 , wherein less than 40 percent of the surface of the core substrate is covered by the plurality of distributed islands of the sintering aid film claim 1 , and wherein the plurality of distributed islands of the sintering aid film are substantially evenly distributed.3. The ceramic particle of claim 2 , wherein about 5 percent of the surface of the core substrate is covered by the plurality of distributed islands of the sintering aid film.4. The ceramic particle of claim 1 , wherein the ceramic particle is non-reactive with water.5. The ceramic particle of claim 1 , wherein the core substrate comprises barium titanate and the sintering aid film comprises at least one compound chosen from alumina claim 1 , an alkaline earth oxide claim 1 , zinc oxide claim 1 , titanium oxide claim 1 , boron nitride claim 1 , a silicon oxide ...

PROPPANT PARTICLES FORMED FROM SLURRY DROPLETS AND METHOD OF USE

Proppant particles formed from slurry droplets and methods of use are disclosed herein. The proppant particles can include a sintered ceramic material and can have a size of about 80 mesh to about 10 mesh and an average largest pore size of less than about 20 microns. The methods of use can include injecting a hydraulic fluid into a subterranean formation at a rate and pressure sufficient to open a fracture therein and injecting a fluid containing a proppant particle into the fracture, the proppant particle including a sintered ceramic material, a size of about 80 mesh to about 10 mesh, and an average largest pore size of less than about 20 microns. 1. A proppant particle , comprising: a size of about 80 mesh to about 10 mesh;', 'a porosity; and', 'an average surface roughness of from about 0.1 micron to about 4 microns., 'a sintered ceramic material and having2. The proppant particle of claim 1 , wherein the sintered ceramic material has an alumina concentration of at least about 40 wt %.3. The proppant particle of claim 2 , wherein the sintered ceramic material has an alumina concentration of at least about 95 wt %.4. The proppant particle of claim 1 , further comprising a plurality of proppant particles comprising a sintered ceramic material and having a size of about 80 mesh to about 10 mesh claim 1 , a porosity claim 1 , and an average surface roughness of from about 0.1 micron to about 4 microns claim 1 , wherein the plurality of the proppant particles has a bulk density of about 1.35 g/cc to about 2.1 g/cc.5. The proppant particle of claim 4 , wherein the proppant particles have a specific gravity of about 2.5 g/cc to about 4.0 g/cc.6. The proppant particle of claim 1 , wherein the proppant particle has a surface roughness of less than about 2 microns.7. A ceramic particle for use in a subterranean formation claim 1 , the ceramic particle comprising:a sintered ceramic material;a size of about 80 mesh to about 10 mesh;a porosity; anda surface roughness of less ...

STRONTIUM MAGNESIUM MOLYBDENUM OXIDE MATERIAL HAVING DOUBLE PEROVSKITE STRUCTURE AND METHOD FOR PREPARING THE SAME

The present invention relates to a strontium magnesium molybdenum oxide material having perovskite structure and the method for preparing the same. Citric acid is adopted as the chelating agent. By using sol-gel pyrolysis and replacing a portion of strontium in SrMgMoOby cerium and a portion of magnesium by copper, a material with a chemical formula of SrCeMgCuMoOis produced, where 0≦x<2, 0 Подробнее

MULTIFUNCTIONAL NANOPARTICLE DESIGNS AND APPLICATIONS

Methods, structures, devices and systems are disclosed for fabricating and implementing nanoparticles with hollow core and sealable holes. In one aspect, a nanoparticle device can includes a shell structure including at least two layers including an internal layer and an external layer, the internal layer structured to enclose a hollow interior region and include one or more holes penetrating the internal layer, the external layer is of a porous material and formed around the internal layer and sealing the one or more holes, and a substance contained within the hollow interior region, the substance incapable of passing through the external layer. 1. A method of fabricating a particle , comprising:combining a core particle with one or more masking particles to form a template, wherein the one or more masking particles bind to the core particle and cover one or more regions of the surface of the core particle, each of the one or more regions corresponding to a surface area formed between each of the one or more masking particles and the core particle;forming a layer of a porous material over the template, wherein the layer forms over the surface of the core particle excluding the covered one or more regions; andremoving the template to produce a particle formed of the porous material, the particle having one or more holes extending between an interior region that is hollow and an external surface of the particle, the one or more holes having a size on the external surface substantially that of the surface area and distributed on the particle at the one or more regions.2. The method of claim 1 , further comprising functionalizing the surface of the core particle and an outer surface of the one or more masking particles claim 1 , wherein the functionalizing produces a positive charge on the surface of the core particle and a negative charge on the outer surface of the one or more masking particles.3. The method of claim 2 , wherein the one or more masking particles bind ...

PREPARATION OF A METASTABLE TETRAGONAL ZIRCONIA AEROGEL

The present application discloses a process for the preparation of metastable tetragonal zirconia in the form of an aerogel material, said material being capable of undergoing martensitic phase transformation to monoclinic zirconia. The application also discloses composite materials, such as dental filling materials, having included therein an aerogel material. 1. A process for the preparation of metastable tetragonal zirconia in the form of an aerogel material , said process comprising the sequential steps of:{'sub': 1', '4, '(a) allowing zirconium(IV) alkoxide to polycondensate in the presence of one or more C-Ccarboxylic acids so as to obtain an amorphous zirconia aerogel;'}(b) optionally washing said amorphous zirconia aerogel;(c) treating said amorphous zirconia aerogel with formic acid;{'sub': '2', '(d) flushing said amorphous zirconia aerogel with liquid or supercritical CO;'}(e) optionally grinding the amorphous zirconia aerogel to obtain a particulate amorphous zirconia aerogel;(f) heating said optionally particulate amorphous zirconia aerogel under a dry atmosphere at a temperature of in the range of 400-750° C. so as to obtain an optionally particulate metastable tetragonal zirconia aerogel.2. The process according to claim 1 , said process comprising the sequential steps of:{'sub': 2', '1', '4, '(a1) allowing zirconium(IV) alkoxide dissolved in liquid or supercritical COto polycondensate in the presence of one or more C-Ccarboxylic acids in a pressurized reaction vessel so as to obtain an amorphous zirconia aerogel;'}{'sub': '2', '(b1) optionally washing said amorphous zirconia aerogel with liquid or supercritical CO;'}{'sub': '2', '(c1) treating said amorphous zirconia aerogel with formic acid in liquid or supercritical CO;'}{'sub': '2', '(d1) flushing said amorphous zirconia aerogel with liquid or supercritical CO;'}(e) optionally grinding the amorphous zirconia aerogel to obtain a particulate amorphous zirconia aerogel;(f) heating said optionally ...

Method of making ceramic shaped abrasive particles, sol-gel composition, and ceramic shaped abrasive particles

A method includes: providing a mold having a plurality of mold cavities, wherein each mold cavity is bounded by a plurality of faces joined along common edges; filling at least some of the mold cavities with a sol-gel composition that includes a release agent dispersed therein; at least partially drying the sol-gel composition thereby forming shaped ceramic precursor particles; calcining at least a portion of the shaped ceramic precursor particles to provide calcined shaped ceramic precursor particles; and sintering at least a portion of the calcined shaped ceramic precursor particles to provide ceramic shaped abrasive particles. A sol-gel composition, shaped ceramic precursor particles, and ceramic shaped abrasive particles associated with practice of the method are also disclosed.

Method for fabrication of crack-free ceramic dielectric films

The invention provides a process for forming crack-free dielectric films on a substrate. The process comprises the application of a dielectric precursor layer of a thickness from about 0.3 μm to about 1.0 μm to a substrate. The deposition is followed by low temperature heat pretreatment, prepyrolysis, pyrolysis and crystallization step for each layer. The deposition, heat pretreatment, prepyrolysis, pyrolysis and crystallization are repeated until the dielectric film forms an overall thickness of from about 1.5 μm to about 20.0 μm and providing a final crystallization treatment to form a thick dielectric film. The process provides a thick crack-free dielectric film on a substrate, the dielectric forming a dense thick crack-free dielectric having an overall dielectric thickness of from about 1.5 μm to about 20.0 μm.

Inorganic Fibre Compositions

A sol is provided for the production of inorganic fibres comprising precursors for aluminium oxide, silicon oxide, strontium oxide, wherein the precursors are present in proportions suitable to yield inorganic fibres having a composition comprising:—70≤AlO≤80 wt %; 10≤SiO≤20 wt %; 10≤SrO≤20 wt % wherein the sum of AlO, SiOand SrO is at least 95 wt %. 2. The inorganic fibers according to claim 1 , wherein the total addition of oxides of alkali earth metals is ≤20 wt %.3. The inorganic fibers according to claim 1 , wherein the inorganic fibres composition comprises: CaO≤2 wt %.4. The inorganic fibers according to claim 3 , wherein the composition comprises: 0 wt % CaO.5. The inorganic fibers according to claim 1 , wherein the composition comprises: MgO≤4 wt %.6. The inorganic fibers according to claim 5 , wherein the composition comprises: 0 wt % MgO.7. The inorganic fibers according to claim 1 , wherein the sum of AlO claim 1 , SiOand SrO is at least 92 wt %.8. The inorganic fibers according to claim 1 , wherein the composition comprises: AlO≤77.5 wt %.9. The inorganic fibers according to claim 1 , wherein the composition comprises: AlO≥72 wt %.1013.-. (canceled)14. The inorganic fibers according to claim 1 , wherein the composition comprises:{'sub': 2', '3, '72≤AlO≤80 wt %;'}{'sub': '2', '10≤SiO≤15 wt %;'}10≤SrO≤15 wt %.15. The inorganic fibers according to claim 14 , wherein the composition comprises:{'sub': 2', '3, '72≤AlO≤77.5 wt %;'}{'sub': '2', '11≤SiO≤15 wt %;'}12.5≤SrO≤15 wt %; and0≤CaO<4 wt %.16. The inorganic fibers according to claim 1 , wherein the composition comprises:{'sub': 2', '3, 'AlO=72.0±1.0 wt %;'}{'sub': '2', 'SiO=14.0±1.0 wt %; and'}SrO=14.0±1.0 wt %.17. The inorganic fibers according to claim 1 , wherein the inorganic fibers have a static biosolubility level of at least 20 ppm and a cyclic compression measured at 900° C. of at least 20 kPa.1829.-. (canceled)30. The inorganic fibers claim 1 , as claimed in according to claim 1 , in which the ...

METHOD FOR MAKING CERAMIC MATRIX COMPOSITE ARTICLES

A method of forming a composite article may include impregnating an inorganic fiber porous preform with a first slurry composition. The slurry composition includes particles, a solvent, and a pre-gellant material. Gelling of the pre-gellant material in the slurry composition is initiated to substantially immobilize the particles and yield a gelled article. The method also includes impregnating the gelled article with a second solution that includes a high char-yielding component, and pyrolyzing the high char-yielding component to yield carbon and form a green composite article. The green composite article is then infiltrated with a molten metal or alloy infiltrant to form the composite article. The molten infiltrant reacts with carbon, and the final composite article may include less residual metal or alloy than a composite article formed without using the second solution. 1. A method comprising:impregnating an inorganic fiber porous preform with a first slurry composition, wherein the first slurry composition comprises ceramic particles, a solvent, and a pre-gellant material;initiating gelation of the pre-gellant material in the first slurry composition to substantially immobilize the particles and yield a gelled article;impregnating the gelled article with a second solution, wherein the second solution comprises a high char-yielding component;pyrolyzing the high char-yielding component to yield carbon and form a green composite article; andinfiltrating the green composite article with a molten metal alloy to form a final composite article, wherein at least some of the molten metal or alloy reacts with the carbon to form a metal carbide.2. The method of claim 1 , wherein the high char-yielding component comprises at least one of furfuryl alcohol or a phenolic material.3. The method of claim 1 , wherein the second solution further comprises at least one of a solvent claim 1 , a polymer interrupter claim 1 , an acid catalyst claim 1 , and a secondary polymer.4. The ...

GEL COMPOSITIONS, SHAPED GEL ARTICLES AND A METHOD OF MAKING A SINTERED ARTICLE

Reaction mixtures, gel compositions that are a polymerized product of the reaction mixtures, shaped gel articles that are formed within a mold cavity and that retain the size and shape of the mold cavity upon removal from the mold cavity, and sintered articles prepared from the shaped gel articles are provided. The sintered article has a shape identical to the mold cavity (except in regions where the mold cavity was overfilled) and to the shaped articles but reduced in size proportional to the amount of isotropic shrinkage. Methods of forming the sintered articles also are provided. 1. A gel composition comprising a polymerized product of a reaction mixture comprising:{'sub': '2', 'a. 20 to 60 weight percent zirconia-based particles based on a total weight of the reaction mixture, the zirconia-based particles having an average particle size no greater than 100 nanometers and comprising at least 70 mole percent ZrO;'}b. 30 to 75 weight percent of a solvent medium based on the total weight of the reaction mixture, the solvent medium comprising at least 60 percent of an organic solvent having a boiling point equal to at least 150° C.;c. 2 to 30 weight percent polymerizable material based on the total weight of the reaction mixture, the polymerizable material comprising (1) a first surface modification agent having a free radical polymerizable group; andd. a photoinitiator for a free radical polymerization reaction.2. The gel composition of claim 1 , wherein the solvent medium comprises at least 80 weight percent of the organic solvent having the boiling point equal to at least 150° C.4. The gel composition of claim 1 , wherein the zirconia-based particles are crystalline and wherein at least 80 weight percent of the zirconia-based particles have a cubic structure claim 1 , tetragonal structure claim 1 , or a combination thereof.5. The gel composition of claim 1 , wherein the first surface modification agent having a free radical polymerizable group further has a ...

OXIDE SUPERCONDUCTOR AND METHOD FOR MANUFACTURING THE SAME

An oxide superconductor of an embodiment includes an oxide superconductor layer having a continuous Perovskite structure containing rare earth elements, barium (Ba), and copper (Cu). The rare earth elements contain a first element which is praseodymium (Pr), at least one second element selected from the group consisting of neodymium (Nd), samarium (Sm), europium (Eu), and gadolinium (Gd), at least one third element selected from the group consisting of yttrium (Y), terbium (Tb), dysprosium (Dy), and holmium (Ho), and at least one fourth element selected from the group consisting of erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu). 1. An oxide superconductor comprising an oxide superconductor layer having a continuous Perovskite structure including rare earth elements , barium (Ba) , and copper (Cu) , the rare earth elements including a first element , at least one second element , at least one third element , and at least one fourth element , the first element being praseodymium (Pr) , the at least one second element being selected from the group consisting of neodymium (Nd) , samarium (Sm) , europium (Eu) , and gadolinium (Gd) , the at least one third element being selected from the group consisting of yttrium (Y) , terbium (Tb) , dysprosium (Dy) , and holmium (Ho) , and the at least one fourth element being selected from the group consisting of erbium (Er) , thulium (Tm) , ytterbium (Yb) , and lutetium (Lu).2. The oxide superconductor according to claim 1 , wherein the oxide superconductor layer includes fluorine (F) of 2.0×10atoms/cc or more and 5.0×10atoms/cc or less and carbon (C) of 1.0×10atoms/cc or more and 5.0×10atoms/cc or less.3. The oxide superconductor according to claim 1 , wherein when the number of atoms of the rare earth elements is N(RE) claim 1 , and the number of atoms of the at least one third element is N(MA) claim 1 , N(MA)/N(RE)≧0.6 is satisfied.4. The oxide superconductor according to claim 1 , wherein when the number of atoms of ...

METHOD FOR FORMING HIGH HEAT-RESISTANT COATING FILM USING LIQUID CERAMIC COMPOSITION AND HIGH HEAT-RESISTANT COATING FILM PREPARED THEREBY

The present invention relates to a high heat-resistant/oxidation-resistant/flame retardant□non-flammable liquid ceramic coating film for protecting an exterior of an apparatus in an extreme environment. Provided are a method of forming a high heat-resistant coating film including: (a) preparing a liquid ceramic filling agent by mixing a ceramic filler including iron (III) oxide (FeO) powder, a diluent, and an inorganic nanosol; (b) applying the liquid ceramic filling agent to at least one surface of a substrate to form a coating film; and (c) curing the coating film by drying the substrate, and a high heat-resistant coating film prepared thereby.

Inorganic nanofiber and method for manufacturing same

Disclosed are an inorganic nanofiber characterized in that the average fiber diameter is 2 μm or less, the average fiber length is 200 μm or less, and the CV value of the fiber length is 0.7 or less; and a method of manufacturing the same. In the manufacturing method, an inorganic nanofiber sheet consisting of inorganic nanofibers having an average fiber diameter of 2 μm or less is formed by electrospinning, and then, the inorganic nanofiber sheet is pressed using a press machine and crushed so that the average fiber length becomes 200 μm or less, and the CV value of the fiber length becomes 0.7 or less.

Production of Ceramic Metal Oxide Membranes by Means of Reactive Electrospinning

Traditionally, the manufacturing of ceramic metal oxide membranes is often expensive and extremely labor intensive due to the often necessary post-processing steps. The present invention discloses to a novel single-step process, to produce ceramic metal oxide membranes. More specifically, this invention relates to reactive electrospinning where a sol-gel solution containing alkoxides is electrically charged and formed a Taylor cone at the tip of a needle in an environment controlled chamber, and the Taylor cone rejects a continuous stream of alkoxide nanofibers which polymerized to form a ceramic metal oxide membrane (with and without a polymer substrate present). The manufactured membranes may be used for various applications, including dye sensitized solar cells and for carbon dioxide capturing. 1. A method for manufacturing ceramic metal oxide membranes by electrospinning comprising:applying an electric voltage to a sol-gel solution wherein the sol-gel solution comprising a solvent, at least one metal alkoxide, and at least one polymer;jetting the sol-gel solution an electrode collector in a controlled environment with a pre-determined humidity, wherein the metal alkoxide hydrolyzed into a metal oxide, the solvent vaporizes, and a condensation reaction occurs that results in the polymerization of the metal oxide.2. The method for manufacturing ceramic metal oxide membranes of wherein the electric voltage is between 5 to 20 kV.3. The method for manufacturing ceramic metal oxide membranes of wherein the at least one polymer is selected from 4 MDa polyethylene oxide claim 1 , polyvinylpyrrolidinone claim 1 , and 4 MDa polyacrylic acid.4. The method for manufacturing ceramic metal oxide membranes of wherein the at least one metal alkoxide comprising an alkoxide precursor in a non-aqueous solvent wherein the alkoxide precursor is selected from magnesium methoxide claim 1 , titanium isopropoxide and tetraethyl orthosilicate.5. The method for manufacturing ceramic metal ...

DRYING, SIZING AND SHAPING PROCESS TO MANUFACTURE CERAMIC ABRASIVE GRAIN

A sol gel abrasive gain and the preparing method thereof are provided. The abrasive grains deriving from alumina powders have various shapes and sizes and can be used to make a bonded or coated abrasive product. The preparing method comprises: coating alumina monohydrate sol to a carrier backing by roller coating, knife coating or extrusion coating method, etc., drying the coating to a high-solid state in a continuous dryer such as backing treatment oven, festoon oven or drum dryer, then shaping and sizing by patterned rollers or screen web, etc., further drying the shaped gel and then calcining, impregnating and sintering the gel to obtain microcrystalline ceramic grains. 1. A manufacturing process of the a sol gel abrasive grain comprising , coating a boehmite sol or gel to a carrier backing , drying the sol or gel on a continuous dryer to gel state and then shaping or sizing the gel state , and further drying the gel state on a horizontal convection oven or multiple pass conveyor belt dryer.2. The manufacturing process according to claim 1 , characterized in that the said carrier backing is a plastic film or silicone film or paper backing with release liner.3. The manufacturing process according to claim 1 , characterized in that the drying claim 1 , the shaping or the sizing are all conducted on drum dryer.4. The manufacturing process according to claim 1 , characterized in that the drying claim 1 , the shaping or the sizing are all conducted on multiple pass conveyer belts dryer.5. The manufacturing process according to claim 1 , characterized in that the drying is conducted in an festoon oven or horizontal convection oven or drum dryer or multiple pass conveyor dryer or other continuous dryers and the sol or gel is coated to a carrier backing and shaped by patterned rollers or screen webs.6. The manufacturing process according to claim 1 , characterized in that the drying claim 1 , the shaping or the sizing are conducted on combinations of festoon oven claim 1 ...

METHOD FOR PREPARING CERAMIC MATERIALS AND PRODUCTS THEREOF

Provided herein is a method of preparing a ceramic material including the steps of providing a ceramic gel comprising a plurality of metal hydroxides and a solvent; and subjecting the ceramic gel to a drying process thereby removing at least a portion of the solvent and forming the ceramic material; and ceramic gels useful for preparing molded ceramic structures. 1. A method of preparing a ceramic material , the method comprising: providing a ceramic gel comprising a plurality of metal hydroxides and a solvent; and subjecting the ceramic gel to a drying process thereby removing at least a portion of the solvent and forming the ceramic material.2. The method of claim 1 , wherein the ceramic gel comprises three or more metal hydroxides.3. The method of claim 1 , wherein each of the plurality of metal hydroxides comprise a metal selected from Group 2 claim 1 , 4 claim 1 , 6 claim 1 , 7 claim 1 , 9 claim 1 , 10 claim 1 , 13 claim 1 , or 14 of the periodic table of elements.4. The method of claim 1 , wherein each of the plurality of metal hydroxides comprise a metal selected from the group consisting of iron claim 1 , cobalt claim 1 , nickel claim 1 , manganese claim 1 , aluminum claim 1 , molybdenum claim 1 , tungsten claim 1 , zinc claim 1 , magnesium claim 1 , calcium claim 1 , titanium claim 1 , and tin.5. The method of claim 4 , wherein the ceramic gel comprises three or more metal hydroxides.6. The method of claim 1 , wherein the solvent comprises water claim 1 , an alcohol claim 1 , dimethylformamide claim 1 , dimethyl sulfoxide claim 1 , or a mixture thereof.7. The method of further comprising the step of: providing a precursor solution comprises a plurality of metal salts; and combining the precursor solution and an inorganic base selected from the group consisting of an alkali metal hydroxide and an alkaline earth metal hydroxide thereby forming the ceramic gel.8. The method of claim 7 , wherein each of the plurality of metal salts comprise one or more anions ...

ZIRCONIA ARTICLE WITH HIGH ALUMINA CONTENT, PROCESS OF PRODUCTION AND USE THEREOF

The invention relates to a porous zirconia article in particular for use in the dental or orthodontic field, the porous zirconia article comprising ZrO: 80 to 87 wt. %,YO: 3 to 5 wt. %, AIO: 10 to 14 wt. %, wt. % with respect to the weight of the porous zirconia article, the porous zirconia article being characterized by a BET surface from 15 to 100 m/g. The invention also relates to a sintered zirconia article in particular for use in the dental or orthodontic field, the sintered zirconia article comprising ZrO: 80 to 87 wt 5, YO: 3 to 5 wt. %), AIO: 10 to 14 wt. %, wt. %) with respect to the weight of the porous zirconia article, the sintered zirconia article being characterized by a corundum crystal phase content of 7 to 12 wt. %>and a flexural strength of at least 2,000 MPa. 2. The porous zirconia article of claim 1 , further being characterized by one or more of the following parameters:{'sub': '2', 'showing a Nadsorption and/or desorption isotherm with a hysteresis loop;'}{'sub': '2', 'showing a Nadsorption and desorption of isotherm type IV according to IUPAC classification and a hysteresis loop;'}{'sub': '2', 'showing a Nadsorption and desorption isotherm of type IV with a hysteresis loop of type H1 according to IUPAC classification; and'}{'sub': '2', 'showing a Nadsorption and desorption isotherm of type IV with a hysteresis loop of type H1 according to IUPAC classification in a p/p0 range of 0.70 to 0.99.'}3. The porous zirconia article of claim 1 , further comprising one or more of the following components:CaO in an amount less than or equal to 1 wt. %;MgO in an amount less than or equal to 1 wt. %;{'sub': '2', 'CeOin an amount less than or equal to 1 wt. %; and'}{'sub': 2', '3, 'LaOin an amount less than or equal to 1 wt. %;'}wherein wt. % is with respect to the weight of the porous zirconia article.4. A sintered zirconia article comprising:{'sub': '2', 'ZrO: 80 to 87 wt. %,'}{'sub': 2', '3, 'YO: 3 to 5 wt. %, and'}{'sub': 2', '3, 'AlO: 10 to 14 wt. %;'} ...

OXIDE SUPERCONDUCTOR AND METHOD FOR MANUFACTURING THE SAME

An oxide superconductor of an embodiment includes an oxide superconductor layer having a continuous Perovskite structure including rare earth elements, barium (Ba), and copper (Cu). The rare earth elements include a first element which is praseodymium, at least one second element selected from the group consisting of neodymium, samarium, europium, and gadolinium, at least one third element selected from the group consisting of yttrium, terbium, dysprosium, and holmium, and at least one fourth element selected from the group consisting of erbium, thulium, ytterbium, and lutetium. When the number of atoms of the first element is N(PA), the number of atoms of the second element is N(SA), and the number of atoms of the fourth element is N(CA), 1.5×(N(PA)+N(SA))≦N(CA) or 2×(N(CA)−N(PA))≦N(SA) is satisfied. 1. An oxide superconductor comprising an oxide superconductor layer having a continuous Perovskite structure including rare earth elements , barium (Ba) , and copper (Cu) ,the rare earth elements including a first element, at least one second element, at least one third element, and at least one fourth element, the first element being praseodymium (Pr), the at least one second element being selected from the group consisting of neodymium (Nd), samarium (Sm), europium (Eu), and gadolinium (Gd), the at least one third element being selected from the group consisting of yttrium (Y), terbium (Tb), dysprosium (Dy), and holmium (Ho), and the at least one fourth element being selected from the group consisting of erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu), andwhen the number of atoms of the first element is N(PA), the number of atoms of the at least one second element is N(SA), and the number of atoms of the at least one fourth element is N(CA), 1.5×(N(PA)+N(SA))≦N(CA) or 2×(N(CA)−N(PA))≦N(SA) is satisfied.2. The oxide superconductor according to claim 1 , wherein 1.5×(N(PA)+N(SA))≦N(CA) is satisfied claim 1 , the at least one second element is selected from ...

SUPERCONDUCTING COIL AND SUPERCONDUCTING DEVICE

A superconducting coil of an embodiment includes a superconducting wire including an oxide superconductor layer. The oxide superconductor layer has a continuous Perovskite structure including rare earth elements, barium (Ba), and copper (Cu). The rare earth elements include a first element which is praseodymium (Pr), at least one second element selected from the group consisting of neodymium (Nd), samarium (Sm), europium (Eu), and gadolinium (Gd), at least one third element selected from the group consisting of yttrium (Y), terbium (Tb), dysprosium (Dy), and holmium (Ho), and at least one fourth element selected from the group consisting of erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu). 1. A superconducting coil comprising a superconducting wire including an oxide superconductor layer ,the oxide superconductor layer having a continuous Perovskite structure including rare earth elements, barium (Ba), and copper (Cu), andthe rare earth elements include a first element, at least one second element, at least one third element, and at least one fourth element, the first element being praseodymium (Pr), the at least one second element being selected from the group consisting of neodymium (Nd), samarium (Sm), europium (Eu), and gadolinium (Gd), the at least one third element being selected from the group consisting of yttrium (Y), terbium (Tb), dysprosium (Dy), and holmium (Ho), and the at least one fourth element being selected from the group consisting of erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu).2. The superconducting coil according to claim 1 , wherein the at least one second element is selected from the group consisting of neodymium (Nd) and samarium (Sm) claim 1 , the at least one third element is selected from the group consisting of yttrium (Y) claim 1 , dysprosium (Dy) claim 1 , and holmium (Ho) claim 1 , and the at least one fourth element is selected from the group consisting of erbium (Er) and thulium (Tm).3. The ...

Anti-icing coating for power transmission lines

Provided are methods and systems for forming piezoelectric coatings on power line cables using sol-gel materials. A cable may be fed through a container with a sol-gel material having a piezoelectric material to form an uncured layer on the surface of the cable. The layer is then cured using, for example, infrared, ultraviolet, and/or other types of radiation. The cable may be suspended in a coating system such that the uncured layer does not touch any components of the system until the layer is adequately cured. Piezoelectric characteristics of the cured layer may be tested in the system to provide a control feedback. The cured layer, which may be referred to as a piezoelectric coating, causes resistive heating at the outer surface of the cable during vibration of the cable due transmission of alternating currents and environmental factors.

Oxide superconductor and method for manufacturing same

An oxide superconductor of an embodiment includes an oxide superconducting layer including at least one superconducting region containing barium (Ba), copper (Cu) and a first rare earth element, having a continuous perovskite structure, and having a size of 100 nm×100 nm×100 nm or more, and a non-superconducting region in contact with the at least one superconducting region, containing praseodymium (Pr), barium (Ba), copper (Cu),and a second. rare earth element, having a ratio of a number of atoms of the praseodymium (Pr) to a sum of a number of atoms of the second rare earth element and the number of atoms of the praseodymium (Pr) being 20% or more, having a continuous perovskite structure continuous with the continuous perovskite structure of the superconducting region, and having a size of 100 nm×100 nm×100 nm or more.

PREPARATION METHOD FOR IMPROVING LIGHT EFFICIENCY AND STABILITY OF LIGHT-STORING CERAMICS

A preparation method for improving light efficiency and stability of light storing ceramics is provided. Calcium ethanol solution is added into titanium precursor solution firstly and oleic acid dispersant is added, pure water and the light storing powder are subsequently added to obtain a light-storing powder-calcium titanate gel, and dried, crushed and sieved to obtain xerogel powder. Glass matrix material, sieved xerogel powder and another dispersant are placed into a granulator, and directly mechanically stirred and granulated after adding pure water. A plasticizer is added after stirring 4˜8 h, and continuously stirred for 1˜3 h to obtain a mixture, pressing, drying and firing. Calcium titanate is manually introduced to protect the light-storing powder from hydrolysis or high-temperature oxidation. It can also change the propagation path of fluorescence inside ceramics, improve light absorption and fluorescence output efficiency and is conducive to ceramic molding. 1. A preparation method for improving light efficiency and stability of light-storing ceramics , comprising:step (1), weighing calcium nitrate and citric acid individually according to a mass ratio of 10:0.5˜1.5, and dissolving the weighed calcium nitrate and the weighed citric acid into an absolute ethanol to form a calcium ethanol solution; weighing tetra-n-butyl titanate, dissolving the weighed tetra-n-butyl titanate into another absolute ethanol, and adding glacial acetic acid dropwise under stifling to form a titanium precursor solution; and under stirring, adding the calcium ethanol solution into the titanium precursor solution, adding oleic acid dispersant and subsequently adding pure water and a light-storing powder, and continuously stifling 1˜4 hours (h) to obtain a light-storing powder-calcium titanate gel;step (2), heating the light-storing powder-calcium titanate gel obtained by the step (1) at a temperature of 80˜150° C. for 2˜8 h to obtain a light-storing powder xerogel coated with ...

METAL OXIDE CERAMIC NANOMATERIALS AND METHODS OF MAKING AND USING SAME

Provided are metal oxide ceramic materials and intermediate materials thereof (e.g., nanozirconia gels, nanozirconia green bodies, pre-sintered ceramic bodies, zirconia dental ceramic materials, and dental articles). The nanozirconia gels are formable gels. Also provided are methods of making and using the metal oxide materials and intermediate materials. The nanozirconia gels can be made using, for example, osmotic processing. The nanozirconia gels can be used to make nanozirconia green bodies, pre-sintered ceramic bodies, zirconia dental ceramic materials, and dental article. The nanozirconia green bodies, pre-sintered ceramic bodies, zirconia dental ceramic materials, and dental articles have desirable properties (e.g., optical properties and mechanical properties). 1. A gel comprising a plurality of zirconia nanoparticles and water , wherein the zirconia nanoparticles have an average size of 10 to 30 nm , 95% or more of the zirconia nanoparticles by volume have a size of 45 nm or less , the zirconia nanoparticles are present at 70 to 85% by weight based on the total weight of the gel , and wherein the gel further comprises a processing agent chosen from colloid stabilizers , particle interaction strengthening agents , and combinations thereof.2. The gel of claim 1 , wherein the processing agent is present from 1.5 to 3.3% by weight of the nanoparticles in the gel.3. The gel of claim 1 , wherein the colloid stabilizer is a dispersant claim 1 , protective colloid claim 1 , or a combination thereof.4. The gel of claim 1 , wherein the colloid stabilizer is an electrosteric colloid stabilizer and/or an electrostatic colloid stabilizer.5. The gel of claim 4 , wherein the colloid stabilizers are chosen from organocarboxylic acids and salts thereof claim 4 , polyoxocarboxylic acids and salts thereof claim 4 , amino acids and salts thereof claim 4 , organoamines and ammonium salts thereof claim 4 , organoalcohols claim 4 , organosilanes claim 4 , and combinations thereof ...

METAL OXIDE CERAMIC NANOMATERIALS AND METHODS OF MAKING AND USING SAME

Provided are metal oxide ceramic materials and intermediate materials thereof (e.g., nanozirconia gels, nanozirconia green bodies, pre-sintered ceramic bodies, zirconia dental ceramic materials, and dental articles). The nanozirconia gels are formable gels. Also provided are methods of making and using the metal oxide materials and intermediate materials. The nanozirconia gels can be made using, for example, osmotic processing. The nanozirconia gels can be used to make nanozirconia green bodies, pre-sintered ceramic bodies, zirconia dental ceramic materials, and dental article. The nanozirconia green bodies, pre-sintered ceramic bodies, zirconia dental ceramic materials, and dental articles have desirable properties (e.g., optical properties and mechanical properties). 1. A gel comprising a plurality of zirconia nanoparticles and water , wherein the zirconia nanoparticles have an average size of 10 to 30 nm , 95% or more of the zirconia nanoparticles by volume have a size of 45 nm or less , the zirconia nanoparticles are present at 70 to 85% by weight based on the total weight of the gel and the gel is a formable gel wherein the gel exhibits a viscosity at yield point of 1×10to 12×10mPa·s.2. A gel comprising a plurality of zirconia nanoparticles and water , wherein the zirconia nanoparticles have an average size of 10 to 30 nm , the zirconia nanoparticles are present at 70 to 85% by weight based on the total weight of the gel and the gel is free-standing and exhibits a viscosity at yield point of 1×10to 50×10mPa·s.3. The gel of claim 2 , wherein the viscosity at yield point is 1×10to 12×10mPa·s and the gel is formable.4. The gel of claim 3 , wherein the viscosity at yield point is 1×10to 4×10mPa·s and the gel is very soft.5. The gel of claim 3 , wherein the viscosity at yield point is 4×10to 8×10mPa·s and the gel is soft.6. The gel of claim 3 , wherein the viscosity at yield point is 8×10to 12×10mPa·s and the gel is semi-soft.7. The gel of claim 2 , wherein the ...

POLYCRYSTALLINE CUBIC BORON NITRIDE AND METHOD FOR PREPARING SAME

The present disclosure relates to polycrystalline cubic boron nitride (PCBN) with enhanced impact-resistance and wear-resistance and a method for producing the PCBN. According to the present disclosure, producing the polycrystalline cubic boron nitride with one or more kinds of protrusion-shaped borides formed on the cubic boron nitride surface may inhibits the development of cracks along the surfaces of the cubic boron nitride particles and binders, thereby to improve the impact-resistance and wear-resistance. In this way, the life-span of the machining tools may be enhanced. Further, the polycrystalline cubic boron nitride may have at least one kind of a compound composed of at least two selected from the group consisting of BN, Ti, W, Co, Zr, and Si as formed during sintering. This may allow the PCBN to have high bonding strength between the cubic boron nitride and the binder. 1. A polycrystalline cubic boron nitride (PCBN) containing cubic boron nitride (CBN) particles and a binder , wherein a protrusion-shaped boride is formed on a surface of the cubic boron nitride particle ,wherein an average particle size of the cubic boron nitride particles is in a range of 4 to 8 μm,wherein a volume of the cubic boron nitride particles is in a range of 70 to 85 vol %,wherein the boride protrusion is present within 100 nm of a distance from a surface of the cubic boron nitride particle, wherein the boride protrusion has a size of 0.001 to 1 μm.2. The polycrystalline cubic boron nitride (PCBN) of claim 1 , wherein the binder contains:a first binder including at least one of nitride, carbide, carbonitride, oxide and boride of Ti, Co, Ni, Cu, W and Zr; anda second binder including at least one of nitride, carbide, carbonitride, oxide, and boride of Al, Cr, Si, Ta, and Nb.3. The polycrystalline cubic boron nitride (PCBN) of claim 1 , wherein the polycrystalline cubic boron nitride contains at least one kind of a compound composed of at least two selected from a group consisting ...

GRAPHENE-CERAMIC HYBRID COATING LAYER, AND METHOD FOR PREPARING THE SAME

Disclosed are a graphene-ceramic hybrid coating layer formed from a graphene-ceramic hybrid sol solution including graphene (RGO: reduced graphene oxide) and a ceramic sol, wherein the graphene content in the graphene-ceramic hybrid coating layer is about 0.001 wt % to about 1.8 wt % based on the total weight of the graphene-ceramic hybrid coating layer, and a method for preparing the same. 1. A graphene-ceramic hybrid sol solution for forming a graphene-ceramic hybrid coating layer , the graphene-ceramic hybrid sol solution including graphene in the form of reduced graphene oxide and a ceramic sol ,wherein a graphene content in the graphene-ceramic hybrid coating layer is about 0.001 wt % to about 1.8 wt % based on the total weight of the graphene-ceramic hybrid coating layer.2. The graphene-ceramic hybrid sol solution of claim 1 , wherein the graphene content is about 0.01 wt % to about 1.8 wt % based on the total weight of the solution.3. The graphene-ceramic hybrid sol solution of claim 1 , wherein the graphene and the ceramic sol are uniformly distributed in the graphene-ceramic hybrid sol solution.4. The graphene-ceramic hybrid sol solution of claim 1 , wherein the ceramic is selected from the group consisting of SiO claim 1 , AlO claim 1 , LiTiO claim 1 , TiO claim 1 , SnO claim 1 , CeO claim 1 , ZrO claim 1 , VO claim 1 , BO claim 1 , BaTiO claim 1 , YO claim 1 , WO claim 1 , MgO claim 1 , CuO claim 1 , ZnO claim 1 , AlPO claim 1 , AlF claim 1 , SiN claim 1 , AlN claim 1 , TiN claim 1 , WC claim 1 , SiC claim 1 , TiC claim 1 , MoSi claim 1 , FeO claim 1 , GeO claim 1 , LiO claim 1 , MnO claim 1 , NiO claim 1 , zeolite claim 1 , and a combination thereof.517-. (canceled) This application claims priority to and the benefit of Korean Patent Application No. 10-2013-0125885 filed in the Korean Intellectual Property Office on Oct. 22, 2013, the entire contents of which are incorporated herein by reference.(a) Field of the InventionThe present invention relates to ...

PREPARATION METHOD FOR YTTRIUM ALUMINUM GARNET CONTINUOUS FIBER

A preparation method for an yttrium aluminum garnet continuous fiber. The method prepares a spinnable precursor sol by utilizing an Alcolloidal particles contained alumina sol, γ-AIOOH nano-dispersion, yttria sol, glacial acetic acid and polyvinylpyrrolidone, then prepares a gel continuous fiber by adopting a dry spinning technique, and carries out a heat treatment to obtain the yttrium aluminum garnet continuous fiber. 1. A method for preparing continuous YAG fiber comprises the following processes:(1) preparation of spinnable sol{'sub': 13', '2', '3', '13', '2', '3', '2', '3', '2', '3, 'The sol containing colloidal Alparticles are mixed with the γ-AlOOH nanodispersion, the mixed is added into the YOsol, stirred in a water bath of 30-40° C., the glacial acetic acid is added during the stirring process, and then the pH value is adjusted to 1-3 by adding dilute nitric acid. The spinning additive PVP is added, stirred and mixed evenly, the aging temperature is set to 25-80° C. until the viscosity of solution is up to 400-600 Pa·s to form the spinnable sol. the sol containing colloidal Alparticles has an alumina content of 15-35 wt %, the YOsol has a solid content of 10-30 wt %, and the γ-AlOOH nanodispersion has a solid content of 8.5-15 wt %, and the molar ratio of YOto glacial acetic acid is 1:(1-2), the amount of PVP is added in 0.5-5 wt % of the total solid content. The molar ratio of YOto aluminum oxide is 1:(1-2).'}(2) dry-spun to prepare YAG gel fiberthe spinnable sol prepared in the process (1) is dry-spun to form YAG gel fiber, and the dry spinning preparative conditions are as follows: the number of the spinneret is 15-800, and the diameter of the spinneret is 0.06-0.15 mm, the wire take-up speed is 60-180 m/min, the environment temperature is 18-40° C., the RH is 20-70%.(3) the ceramization of YAG gel fiberthe YAG gel fiber formed in the process (2) is ceramized, heated to 450-600° C. at a rate of 0.5-3° C./min, and incubated at that temperature for 0.5-2 h ...

Conductive Materials Made of Nb-Doped TiO2 Particles

A method for producing conductive materials from Nb-doped TiO2-particles, in which Nb-doped TiO2-particles are pressed to form bodies and the bodies are treated in an oxygen-containing atmosphere and at a reducing atmosphere.

SEGMENTED FLEXIBLE GEL COMPOSITES AND RIGID PANELS MANUFACTURED THEREFROM

The present invention describes various methods for manufacturing gel composite sheets using segmented fiber or foam reinforcements and gel precursors. Additionally, rigid panels manufactured from the resulting gel composites are also described. The gel composites are relatively flexible enough to be wound and when unwound, can be stretched flat and made into rigid panels using adhesives. 1. A process comprising the steps of:providing a segmented reinforcement sheet comprising a segmented fiber reinforcement sheet or a segmented open-cell foam reinforcement sheet;combining the segmented reinforcement sheet with a gel precursor;gelling the gel precursor in the segmented reinforcement sheet to make a segmented reinforced gel composite sheet;anddrying the segmented reinforced gel composite sheet to make a reinforced aerogel composite sheet.2. The process of further comprising the step of applying an adhesive to at least one face of the reinforced aerogel composite sheet and attaching it to another planar material.3. The process of claim 1 , further comprising the steps of:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'providing the reinforced aerogel composite sheet of with at least two major surfaces and multiple segmented cross-sectional surfaces;'}applying an adhesive to at least one surface of said reinforced aerogel composite sheet; andattaching the reinforced aerogel composite sheet to another aerogel composite sheet.4. (canceled)5. The process of wherein the segmented reinforcement sheet has a facing layer or sheet attached to it.6. The process of wherein facing layer comprises fibers.7. The process of wherein the segmented reinforcement sheet comprises a segmented fiber reinforcement sheet which comprises non-continuous fibers.8. The process of further comprising the step of incorporating additives selected from the group consisting of titanium dioxide claim 1 , iron oxides claim 1 , carbon black claim 1 , graphite claim 1 , aluminum hydroxide claim 1 , ...

NANOCRYSTALLINE CERAMIC OXIDE BEADS

Plurality of nanocrystalline percent by volume crystalline ceramic oxide beads, wherein the nanocrystalline ceramic oxide beads have an average crystallite size up to 250 nm, wherein each bead collectively comprises, on a theoretical oxides basis, at least one of AlO, SiO, TiO, or ZrOat least 40 weight percent, and at least 1 weight percent of at least one of a transition metal oxide or at least one BiOor CeO, based on the total weight of the nanocrystalline ceramic oxide beads, and are visibly dark and infrared transmissive. The beads are useful, for example, in pavement markings. 1. A plurality of nanocrystalline ceramic oxide beads , wherein the nanocrystalline ceramic oxide beads have an average crystallite size up to 250 nm , wherein each bead collectively comprises , on a theoretical oxides basis , at least 40 weight percent of at least one of AlO , SiO , TiO , or ZrO , and at least 1 weight percent of at least one of a transition metal oxide or at least one of BiOor CeO , based on the total weight of the nanocrystalline ceramic oxide beads , and are visibly dark and infrared transmissive.2. The plurality of nanocrystalline ceramic oxide beads of collectively comprising claim 1 , on a theoretical oxides basis claim 1 , at least 80 percent by weight SiOand ZrO claim 1 , based on the total weight of the nanocrystalline ceramic oxide beads.3. The plurality of nanocrystalline ceramic oxide beads of collectively comprising claim 1 , on a theoretical oxides basis claim 1 , at least 80 percent by weight AlO claim 1 , SiO claim 1 , and ZrO claim 1 , based on the total weight of the nanocrystalline ceramic oxide beads.4. The plurality of nanocrystalline ceramic oxide beads of collectively comprising claim 1 , on a theoretical oxides basis claim 1 , at least 70 percent weight AlO claim 1 , SiO claim 1 , TiO claim 1 , and ZrO claim 1 , based on the total weight of the nanocrystalline ceramic oxide beads.5. The plurality of nanocrystalline ceramic oxide beads of ...

ABRASIVE ARTICLE INCLUDING SHAPED ABRASIVE PARTICLES

Various shaped abrasive particles are disclosed. Each shaped abrasive particle includes a body having at least one major surface and a side surface extending from the major surface. 1. A shaped abrasive particle comprising a body including a first major surface , a second major surface , and a side surface extending between the first and second major surfaces , wherein the body has a two-dimensional shape of a regular polygon , an irregular polygon , or complex shape , and wherein the side surface includes a first portion extending for a fraction of a total length between two exterior corners on a first portion of the side surface and wherein the first portion comprises a plurality of protrusions and grooves.2. The shaped abrasive particle of claim 1 , wherein the plurality of protrusions and grooves are spaced away from and between a first exterior corner and second exterior corner defining the first portion of the side surface.3. The shaped abrasive particle of claim 1 , wherein the plurality of protrusions and grooves includes at least one groove that extends into the body from the first portion of the side surface.4. The shaped abrasive particle of claim 1 , wherein the plurality of protrusions and grooves includes a serrated portion extending along a portion of the first portion of the side surface.5. The shaped abrasive particle of claim 1 , wherein the plurality of protrusions and grooves consists of a single group of continuous and adjacent grooves on the first portion of the side surface.6. The shaped abrasive particle of claim 1 , wherein the plurality of protrusions and grooves includes a plurality of grooves that are adjacent to one another.7. The shaped abrasive particle of claim 1 , wherein the plurality of protrusions and grooves includes a plurality of grooves that are abutting one another.8. The shaped abrasive particle of claim 1 , wherein the plurality of protrusions and grooves includes a plurality of grooves that extend for a full thickness of ...

METHOD AND APPARATUS FOR PRODUCING ALUMINA MONOHYDRATE AND SOL GEL ABRASIVE GRAIN

A new method and apparatus is applied to manufacture boehmite and sol gel abrasive grain with greatly reduced raw material cost. The raw material starts from alumina trihydrate, which is transferred to highly dispersible alumina monohydrate under hydrothermal treatment in an agitated zirconium-steel or titanium-steel cladding plate high pressure reactor. Then the highly dispersed and deionized sol is converted to sintered high-density microcrystalline ceramic abrasive grain by sol-gel process. 1. A process to make highly dispersible boehmite suitable as raw material of sol gel abrasive grain , characterized in that , the boehmite is made by converting alumina trihydrate to boehmite in an agitated zirconium-steel or titanium-steel cladding plate vessel or pure titanium vessel.2. A sol gel abrasive grain with various shapes and sizes claim 1 , characterized in that claim 1 , the raw material boehmite is prepared as described in .3. A sintered abrasive grain with various shapes and sizes claim 1 , characterized in that claim 1 , the alpha alumina or other form of alumina is derived from the boehmite prepared as described in .43. A coated abrasive product claims 2 , characterized in that claims 2 , its grain is made as described in one of & .53. A bonded abrasive product claims 2 , characterized in that claims 2 , its grain is made as described in one of & .6. An autoclave or a reactor or vessel claims 2 , characterized in that claims 2 , it is made from titanium-steel or zirconium-steel cladding plate or pure titanium and used as hydrothermal treatment in sol gel abrasive grain manufacturing process. The invention relates to a new method and apparatus to manufacture boehmite and sol gel abrasive grain with greatly reduced raw material cost. The raw material starts from alumina trihydrate, which is transferred to highly dispersible alumina monohydrate under hydrothermal treatment in an agitated zirconium-steel or titanium-steel cladding plate high pressure reactor. Then ...

SCRATCH-RESISTANT COATING FOR GLASS CERAMIC COOKTOP

Scratch-resistant coatings, especially for cooktops, and substrates or products having said scratch-resistant coatings and methods for the production thereof are described herein. More particularly, scratch-resistant coatings obtained via sol-gel approach and coated substrates having thereon a hard material layer comprising metal nitride(s) and/or metal oxynitride complexes are described, as well as the manufacturing thereof. 120.-. (canceled)21. A method of forming a coated cooking surface , the method comprising:providing a substrate defining a cooking surface;preparing a sol coating for deposition on the cooking surface; anddepositing the sol coating on the cooking surface.22. The method of claim 21 , wherein preparing the sol coating includes:solubilizing one or more metal precursors in a solvent to form a solubilized precursor;mixing the solubilized precursor with a nitrogen carrier to form the sol coating;wherein a molar ratio between the nitrogen carrier and the one or more metal precursors is 0.5 to 5.23. The method of claim 22 , wherein preparing the sol coating further includes taking the sol coating under nitrogen flux.24. The method of claim 22 , wherein preparing the sol coating further includes adding (3-glycidyloxypropyl)trimethoxysilane to the sol coating.25. The method of claim 22 , wherein preparing the sol coating further includes adding a viscosity modifier or thickener to the sol coating.26. The method of claim 25 , wherein the viscosity modifier or thickener is polyvinyl alcohol (PVA) claim 25 , methylcellulose claim 25 , or mixtures thereof.27. The method of claim 22 , wherein the molar ratio is 0.5 to 2.28. The method of claim 21 , wherein depositing the sol coating on the cooking surface is via dip-coating claim 21 , spray-coating claim 21 , digital printing claim 21 , roll coating claim 21 , screen-printing claim 21 , or combinations thereof.29. The method of claim 21 , further comprising curing the sol coating to form a transparent and ...

ZIRCONIA SINTERED BODY CONTAINING FLUORESCENT AGENT

The present invention provides a zirconia sintered body containing a fluorescent agent and having excellent translucency and excellent strength. The present invention also provides a zirconia shaped body and a zirconia calcined body from which the zirconia sintered body can be obtained. The present invention relates to a zirconia sintered body comprising a fluorescent agent, wherein the zirconia sintered body comprises 4.5 to 9.0 mol % yttria, and has a crystal grain size of 180 nm or less, and a three-point flexural strength of 500 MPa or more. The present invention relates to a zirconia shaped body comprising a fluorescent agent, wherein the zirconia shaped body comprises 4.5 to 9.0 mol % yttria, and has a three-point flexural strength of 500 MPa or more after being sintered at 1,100° C. for 2 hours under ordinary pressure, and a crystal grain size of 180 nm or less after being sintered at 1,100° C. for 2 hours under ordinary pressure. The present invention relates to a zirconia calcined body comprising a fluorescent agent, wherein the zirconia calcined body comprises 4.5 to 9.0 mol % yttria, and has a three-point flexural strength of 500 MPa or more after being sintered at 1,100° C. for 2 hours under ordinary pressure, and a crystal grain size of 180 nm or less after being sintered at 1,100° C. for 2 hours under ordinary pressure. 1: A zirconia sintered body comprisinga fluorescent agent,wherein the zirconia sintered body comprises 4.5 to 9.0 mol % yttria, and has a crystal grain size of 180 nm or less, and a three-point flexural strength of 500 MPa or more.2: The zirconia sintered body according to claim 1 ,wherein the fluorescent agent contains a metallic element, andthe zirconia sintered body comprises the fluorescent agent in an amount of 0.001 to 1 mass % in terms of an oxide of the metallic element relative to a mass of zirconia.3: The zirconia sintered body according to claim 1 ,wherein the zirconia sintered body has a transmittance of 40% or more for ...

METHOD FOR MAKING CERAMIC MATRIX COMPOSITE ARTICLES

A method of forming a composite article may include impregnating an inorganic fiber porous preform with a first slurry composition. The slurry composition includes particles, a solvent, and a pre-gellant material. Gelling of the pre-gellant material in the slurry composition is initiated to substantially immobilize the particles and yield a gelled article. The method also includes impregnating the gelled article with a second solution that includes a high char-yielding component, and pyrolyzing the high char-yielding component to yield carbon and form a green composite article. The green composite article is then infiltrated with a molten metal or alloy infiltrant to form the composite article. The molten infiltrant reacts with carbon, and the final composite article may include less residual metal or alloy than a composite article formed without using the second solution. 1. A method comprising:impregnating an inorganic fiber porous preform with a first slurry composition, wherein the first slurry composition comprises ceramic particles, a solvent, and a pre-gellant material and does not include a high char-yielding component;initiating gelation of the pre-gellant material in the first slurry composition to substantially immobilize the ceramic particles and yield a gelled article;impregnating the gelled article with a second solution, wherein the second solution comprises the high char-yielding component;pyrolyzing the high char-yielding component to yield carbon and form a green composite article; andinfiltrating the green composite article with a molten metal alloy to form a final composite article, wherein at least some of the molten metal or alloy reacts with the carbon to form a metal carbide.2. The method of claim 1 , wherein the high char-yielding component comprises at least one of furfuryl alcohol or a phenolic material.3. The method of claim 1 , wherein the second solution further comprises at least one of a second solvent claim 1 , a polymer interrupter ...

A METHOD OF PREPARING METAL OXIDE MICROTUBES

The present invention prescribes a new sol-gel method of preparing and formation of the metal oxide microtubes. According to the method firstly is prepared the precursor sol from metal oxides or mixtures of metal oxides and alkoxides, thereafter from the precursor sol are extruded the fibres, which are gelatinised afterwards until the inner sol which is less viscous of fibres is converted to thinner wall until alcohol from the precursor is left trough walls. The metal oxide microtubes are applicable as to conduct liquids or gasses, as ionic conductors, as catalyst carriers and as light emitters. 1. A method for preparing metal oxide microtubes from a precursor material , which is a mixture comprising metal alkoxides , metal-organic compounds or metal salts and a high boiling-point solvent , the method comprising the steps ofa) selecting the high boiling-point solvent material, concentration and amount of said material to achieve viscosity of the precursor material from 10-30000 P,b) directing the precursor material into jets in a humid environment, wherein the surface of the jets starts to solidify by a polycondensation process, which leads to the formation of a three-dimensional network of precursor particles forming a rigid solid shell on the surface of the jet, whereafterc) the thickening of the rigid solid shell continues by consuming solid content of the precursor material to form a thicker shell wall until a microtube is formed, which is filled by a liquid phase of released organic substances contained in the precursor material, thereafterd) aging the microtubes in a gaseous environment to remove the organic substances from the hollow core thereby densifying the wall material of the microtube.2. The method according to claim 1 , wherein the microtubes are heated after step c) at 500-1000° C. for at least 2 hours to obtain a stable tetragonal or cubic structure of microtube material.3. The method according to claim 1 , wherein the metal alkoxide is selected ...

Ce-DOPED PZT-BASED PIEZOELECTRIC FILM

A Ce-doped PZT-based piezoelectric film is provided which is formed of Ce-doped composite metal oxides represented by a general formula: PbCeZrTiO. x, y, and z in the general formula satisfy a relationship of 0.005≦x≦0.05, a relationship of 0.40≦y≦0.55, and a relationship of 0.95≦z≦1.15, respectively. It is preferable that the hysteresis of the polarization quantity of the Ce-doped PZT-based piezoelectric film be shifted from the center of the hysteresis to a negative side by 4 kV/cm or more. 1. A Ce-doped PZT-based piezoelectric film formed of Ce-doped composite metal oxides represented by a general formula: PbCeZrTiO ,wherein x, y, and z in the general formula satisfy a relationship of 0.005≦y≦0.05, a relationship of 0.40≦y≦0.55, and a relationship of 0.95≦z≦1.15, respectively.2. The Ce-doped PZT-based piezoelectric film according to claim 1 ,wherein the hysteresis of the polarization quantity is shifted from the center of the hysteresis to a negative side by 4 kV/cm or more.3. The Ce-doped PZT-based piezoelectric film according to claim 1 ,wherein a (100) orientation degree obtained by X-ray diffraction is equal to or greater than 80%.4. The Ce-doped PZT-based piezoelectric film according to claim 1 ,wherein a film thickness is from 1000 nm to 5000 nm. The present invention relates to a Ce-doped PZT-based piezoelectric film used in a piezoelectric element, an IPD, a pyroelectric element, a gyro sensor, a vibration power generation element, or an actuator.Priority is claimed on Japanese Patent Application No. 2014-065632, filed Mar. 27, 2014, the content of which is incorporated herein by reference.Patent Document 1 discloses a composition for forming a ferroelectric thin film for forming one kind of ferroelectric thin film selected from the group consisting of PLZT, PZT, and PT, which is a liquid composition for forming a thin film formed of a mixed composite metal oxide in which a composite metal oxide B containing Ce is mixed with a composite metal oxide A ...

NANOPOUROUS SELECTIVE SOL-GEL CERAMIC MEMBRANES

Nanoporous selective sol-gel ceramic membranes, selective-membrane structures, and related methods are described. Representative ceramic selective membranes include ion-conductive membranes (e.g., proton-conducting membranes) and gas selective membranes. Representative uses for the membranes include incorporation into fuel cells and redox flow batteries (RFB) as ion-conducting membranes. 1. A nanoporous selective sol-gel ceramic membrane , comprising:a porous support having a plurality of support pores that are 10 nm or greater in diameter; anda nanoporous composite comprising a nanoporous sol-gel ceramic composite filling at least a portion of the porous support;wherein the nanoporous composite comprises a plurality of nanopores of 5 nm or smaller in radius with a polydispersity index of 0.7 or lower.2. The nanoporous selective sol-gel ceramic membrane of claim 1 , wherein the porous substrate comprises a material selected from the group consisting of a polymeric material claim 1 , a ceramic material claim 1 , a metal claim 1 , and a combination thereof.3. The nanoporous selective sol-gel ceramic membrane of claim 1 , wherein the porous substrate comprises a material selected from the group consisting of polypropylene claim 1 , polyethylene claim 1 , polyvinyl chloride claim 1 , polystyrene claim 1 , polyamide claim 1 , polyimide claim 1 , polyacetonitrile claim 1 , polyvinylacetate claim 1 , polyethylene glycol claim 1 , poly ether ketone claim 1 , polysulfone claim 1 , polysulfonamide claim 1 , polyacrylamide claim 1 , polydimethylsiloxane claim 1 , polyvinylidene fluoride claim 1 , polyacrylic acid claim 1 , polyvinyl alcohol claim 1 , polyphenylene sulfide claim 1 , polytetrafluoroethylene claim 1 , cellulose claim 1 , and combinations thereof.4. The nanoporous selective sol-gel ceramic membrane of claim 1 , wherein the porous substrate comprises silica claim 1 , titania claim 1 , zirconia claim 1 , germania claim 1 , alumina claim 1 , graphite claim 1 , ...

ELONGATE SHAPED ABRASIVE PARTICLES, METHODS OF MAKING THE SAME, AND ABRASIVE ARTICLE INCLUDING THE SAME

An elongate shaped abrasive particle comprises an elongate shaped ceramic body having opposed first and second ends joined to each other by at least two longitudinal sidewalls. At least one of the at least two longitudinal sidewalls is concave along its length. At least one of the first and second ends is a fractured surface. Methods of making elongate shaped abrasive particles and abrasive articles including them are also disclosed. 1. An elongate shaped abrasive particle comprising an elongate shaped ceramic body having opposed first and second ends joined to each other by at least two longitudinal sidewalls , wherein at least one of the at least two longitudinal sidewalls is concave along its length , and wherein at least one of the first and second ends is a fractured surface.2. The elongate shaped abrasive particle of claim 1 , wherein said at least two longitudinal sidewalls consist of two longitudinal sidewalls claim 1 , and wherein the elongate shaped ceramic body has a continuous crescent-shaped cross-sectional shape.3. The elongate shaped abrasive particle of claim 1 , wherein said at least two longitudinal sidewalls comprise four longitudinal sidewalls claim 1 , two of which are parallel.4. The elongate shaped abrasive particle of claim 1 , wherein the elongate shaped ceramic body has an aspect ratio of at least two.5. The elongate shaped abrasive particle of claim 1 , wherein the elongate shaped ceramic body has an aspect ratio of at least ten.6. The elongate shaped abrasive particle of claim 1 , wherein the elongate shaped ceramic body comprises alpha alumina.7. A plurality of abrasive particles claim 1 , wherein at least half of the plurality of abrasive particles comprises elongate shaped abrasive particles according to .8. A bonded abrasive article comprising a plurality of abrasive particles according to bonded together by a binder material.9. The bonded abrasive article of claim 8 , wherein the binder material comprises a vitreous binder material. ...

COMPOSITION FOR FORMING Ce-DOPED PZT-BASED PIEZOELECTRIC FILM

A composition for forming a Ce-doped PZT-based piezoelectric film contains: PZT-based precursors containing metal atoms configuring the composite metal oxides; a diol; and polyvinylpyrrolidone. The PZT-based precursors are contained so that a metal atom ratio (Pb:Ce:Zr:Ti) in the composition satisfies (1.00 to 1.28):(0.005 to 0.05):(0.40 to 0.55):(0.60 to 0.45) and the total of Zr and Ti in a metal atom ratio is 1. A concentration of the PZT-based precursor in 100 mass % of the composition is from 17 mass % to 35 mass % in terms of an oxide concentration, a rate of diol in 100 mass % of the composition is from 16 mass % to 56 mass %, and a molar ratio of polyvinylpyrrolidone to 1 mole of the PZT-based precursor is 0.01 moles to 0.25 moles in terms of monomers. 1. A composition for forming a PZT-based piezoelectric film formed of Ce-doped composite metal oxides , the composition comprising:PZT-based precursors containing metal atoms configuring the composite metal oxides;a diol; andpolyvinylpyrrolidone or polyethylene glycol,wherein the PZT-based precursors are contained so that a metal atom ratio (Pb:Ce:Zr:Ti) in the composition satisfies (1.00 to 1.28):(0.005 to 0.05):(0.40 to 0.55):(0.60 to 0.45) and the total of Zr and Ti in a metal atom ratio is 1 in the composition,a concentration of the PZT-based precursor in 100 mass % of the composition is from 17 mass % to 35 mass % in terms of an oxide concentration,a rate of diol in 100 mass % of the composition is from 16 mass % to 56 mass %, anda molar ratio of polyvinylpyrrolidone or polyethylene glycol to 1 mole of the PZT-based precursor is 0.01 moles to 0.25 moles in terms of monomers.2. The composition for forming a Ce-doped PZT-based piezoelectric film according to claim 1 , further comprising:linear monoalcohol having 6 to 12 carbon atoms of which a rate added in 100 mass % of the composition is from 0.6 mass % to 10 mass %. The present invention relates to a composition for forming a Ce-doped PZT-based ...

Insulating product for the refractory industry, corresponding insulating materials and products, and uses

An insulating product for the refractory industry or an insulating material as intermediate for production of such a product, and a corresponding insulating material/insulating product are provided. Likewise the use of a matrix encapsulation process in the production of an insulating product for the refractory industry and a corresponding insulating product and/or an insulating material as intermediate for production of such a product are provided.

Non-respirable, polycrystalline, aluminosilicate ceramic filaments, fibers, and nonwoven mats, and methods of making and using the same

A non woven web including a multiplicity of non-respirable, polycrystalline, aluminosilicate ceramic filaments entangled to form a cohesive mat, the polycrystalline, aluminosilicate ceramic filaments having an average mullite percent of at least 75 wt %. The cohesive mat preferably exhibits a compression resilience after 1,000 cycles at 900° C. when measured according to the Fatigue Test, of at least 30 kPa. Insulation articles including the cohesive mats or formed by chopping the ceramic mats into ceramic fibers, pollution control devices including the insulation articles, and methods of making the non-respirable, polycrystalline, aluminosilicate ceramic filaments and fibers, nonwoven webs, insulation articles, and pollution control devices, are also described.

ULTRA-HIGH DIELECTRIC CONSTANT GARNET

Disclosed are embodiments of synthetic garnet materials for use in radiofrequency applications. In some embodiments, increased amounts of bismuth can be added into specific sites in the crystal structure of the synthetic garnet in order to boost certain properties, such as the dielectric constant and magnetization. Accordingly, embodiments of the disclosed materials can be used in high frequency applications, such as in base station antennas. 1. (canceled)2. An ultra-high dielectric constant garnet comprising:an yttrium iron garnet crystal structure with at least some yttrium being substituted out for bismuth, at least some yttrium being substituted by gadolinium, lanthanum, praseodymium, neodymium, samarium, dysprosium, ytterbium, or holmium, and charge balance achieved by calcium or zirconium substituting for at least some yttrium.3. The ultra-high dielectric constant garnet of wherein the ultra-high dielectric constant garnet has a dielectric constant of at least 40.4. The ultra-high dielectric constant garnet of wherein the ultra-high dielectric constant garnet does not contain sillenite.5. The ultra-high dielectric constant garnet of further including hafnium or titanium incorporated into octahedral sites of the yttrium iron garnet crystal structure.6. The ultra-high dielectric constant garnet of wherein the ultra-high dielectric constant garnet contains no yttrium.7. The ultra-high dielectric constant garnet of wherein the ultra-high dielectric constant garnet has a magnetization of 1600 4πMor above.8. The ultra-high dielectric constant garnet of wherein at least some yttrium is substituted by gadolinium.9. A method of producing an ultra-high dielectric constant garnet claim 2 , the method comprising:providing an yttrium iron garnet structure;substituting out at least some yttrium for bismuth;substituting out at least some yttrium for gadolinium, lanthanum, praseodymium, neodymium, samarium, dysprosium, ytterbium, or holmium; andcharge balancing by ...

CERAMIC MATERIAL HAVING A POSITIVE SLOW RELEASE EFFECT, METHOD FOR MANUFACTURING THE SAME, AND SYSTEM COMPRISING THE SAME

The present disclosure discloses a ceramic material having a positive slow release effect and a method for manufacturing the same. The ceramic material comprises a hierarchically meso-macroporous structure which composition at least includes silicon and oxygen, wherein the hierarchically meso-macroporous structure includes a plurality of macropores and a wall having a plurality of arranged mesopores, and the plurality of macropores are separated by the wall; and nano-scale metal particles confined in at least one of the plurality of arranged mesopores. The nano-scale metal particles have a positive slow release effect from the at least one of the plurality of arranged mesopores. The ceramic material has a property of inhibiting growth of microorganisms or killing the microorganisms in an environment or a system containing a hydrophilic medium. 1. A ceramic material , comprising:a hierarchically meso-macroporous structure which composition at least includes silicon and oxygen, wherein the hierarchically meso-macroporous structure comprises a plurality of macropores and a wall having a plurality of arranged mesopores, and the plurality of macropores are separated by the wall; andnano-scale metal particles confined in at least one of the plurality of arranged mesopores, wherein the nano-scale metal particles have a positive slow release effect from the at least one of the plurality of arranged mesopores, wherein a quantity of the nano-scale metal particles is no more than 10% of a total quantity of the composition to form the hierarchically meso-macroporous structure, and the quantity of the nano-scale metal particles and the total quantity of the composition to form the hierarchically meso-macroporous structure are expressed in moles.2. The ceramic material according to claim 1 , wherein the positive slow release effect of the nano-scale metal particles is defined as a concentration of the nano-scale metal particles releasing positively metal ions of at least 2 ppm ...

SOL CONTAINING NANO ZIRCONIA PARTICLES FOR USE IN ADDITIVE MANUFACTURING PROCESSES FOR THE PRODUCTION OF 3-DIMENSIONAL ARTICLES

The invention relates to the use of a printing sol as construction material in an additive manufacturing process for producing a 3-dim article, the printing sol comprising solvent(s), nano-sized crystalline zirconia particles in an amount from 2 to 25 vol.-% with respect to the volume of the sol, the average primary particle size of the nano-sized crystalline zirconia particles being in a range up to 50 nm, a first monomer being a polymerizable surface modification agent represented by formula A-B, with A being capable of attaching to the surface of the nano-sized crystalline zirconia particles and B being a radiation curable group, optionally a second monomer, the second monomer comprising at least one radiation curable moiety but no acidic or silane group(s), photo initiator(s). The invention also relates to a ceramic article obtainable according to such a process. 1. Use of a printing sol as construction material in an additive manufacturing process for producing a [3-dim] three-dimensional article , the printing sol comprising:solvent(s);nano-sized crystalline zirconia particles in an amount from 2 to 25 vol.-% with respect to the volume of the sol, the average primary particle size of the nano-sized crystalline zirconia particles being in a range up to 50 nm;a first monomer being a polymerizable surface modification agent represented by formula A-B, with A being capable of attaching to the surface of the nano-sized crystalline zirconia particles and B being a radiation curable group;optionally a second monomer, the second monomer comprising at least one radiation curable moiety but no acidic or silane group(s); andphotoinitiator(s).2. The use of claim 1 , the printing sol being characterized by at least one or all of the following features:being translucent in a wave length range from 420 to 600 nm for a path length of 10 mm;showing a transmission of at least 5% at 420 nm determined for a path length of 10 mm;the sol having a viscosity of less than 500 mPa*s at ...

COMPOSITION FOR FORMING Mn AND Nb CO-DOPED PZT-BASED PIEZOELECTRIC FILM

A composition used for forming a PZT-based piezoelectric film formed of Mn and Nb co-doped composite metal oxides is provided, in which the composition includes PZT-based precursors so that a metal atom ratio (Pb:Mn:Nb:Zr:Ti) in the composition satisfies (1.00 to 1.25):(0.002 to 0.056):(0.002 to 0.056):(0.40 to 0.60):(0.40 to 0.60), a rate of Mn is from 0.20 to 0.80 when the total of metal atom rates of Mn and Nb is 1, a rate of Zr is from 0.40 to 0.60 when the total of metal atom rates of Zr and Ti is 1, and the total rate of Zr and Ti is from 0.9300 to 0.9902 when the total of metal atom rates of Mn, Nb, Zr, and Ti is 1. 1. A composition for forming a Mn and Nb co-doped PZT-based piezoelectric film used for forming a PZT-based piezoelectric film formed of Mn and Nb co-doped composite metal oxides , the composition comprising:PZT-based precursors containing metal atoms configuring the composite metal oxides,wherein the PZT-based precursors are contained in the composition so that a metal atom ratio (Pb:Mn:Nb:Zr:Ti) in the composition satisfies (1.00 to 1.25):(0.002 to 0.056):(0.002 to 0.056):(0.40 to 0.60):(0.40 to 0.60), a rate of Mn is from 0.20 to 0.80 when the total of metal atom rates of Mn and Nb is 1, a rate of Zr is from 0.40 to 0.60 when the total of metal atom rates of Zr and Ti is 1, and the total rate of Zr and Ti is from 0.9300 to 0.9902 when the total of metal atom rates of Mn, Nb, Zr, and Ti is 1.2. The composition for forming a Mn and Nb co-doped PZT-based piezoelectric film according to claim 1 , further comprising:acetylacetone as a stabilizer; anda diol as a solvent.3. The composition for forming a Mn and Nb co-doped PZT-based piezoelectric film according to claim 2 ,wherein the diol is propylene glycol or ethylene glycol.4. The composition for forming a Mn and Nb co-doped PZT-based piezoelectric film according to claim 2 ,wherein an amount of acetylacetone contained in the composition is from 0.5 moles to 4 moles when the total amount of Mn, Nb, ...

POROUS BODIES WITH ENHANCED PORE ARCHITECTURE PREPARED WITHOUT A HIGH-TEMPERATURE BURNOUT MATERIAL

A precursor mixture for producing a porous body, wherein the precursor mixture comprises: (i) at least one milled alpha alumina powder having a particle size of 0.1 to 6 microns, (ii) non-silicate powder that functions as a binder of the alpha alumina powders, and (iii) at least one burnout material having a particle size of 1-10 microns and a decomposition temperature of less than 550° C., with the proviso that a burnout material having a decomposition temperature of 550° C. or greater is excluded from the precursor mixture. 1. A method for producing a porous body , the method comprising:providing a precursor mixture comprising (i) milled alpha alumina powder having a particle size of 0.1 to 6 microns, (ii) non-silicate binder of the alpha alumina powders, and (iii) a burnout material having a particle size of 1-10 microns and a decomposition temperature of less than 550° C., with the proviso that a burnout material having a decomposition temperature of 550° C. or above is excluded;forming the precursor mixture into a predetermined shape; andsubjecting the shape to a heat treatment step in which the shape is sintered to produce the porous body.2. The method of claim 12 , further comprising unmilled alpha alumina powder having a particle size of 10 to 100 microns in said precursor mixture.3. The method of claim 13 , wherein the weight ratio of milled to unmilled alpha alumina powder is in a range of 0.25:1 to about 5:1.4. The method of claim 12 , wherein unmilled alpha alumina powder is excluded from the precursor mixture.5. The precursor mixture of claim 12 , wherein the non-silicate binder is nano-sized boehmite6. The method of claim 12 , wherein the providing the precursor mixture comprises:(i) dispersing said non-silicate binder into water to produce a dispersion of said binder;(ii) adding said milled alpha alumina powder having a particle size of 0.1 to 6 microns to the dispersion of the non-silicate binder, and mixing until a first homogeneous mixture is ...

METHOD AND COMPOSITION FOR PRODUCING SILICON-CARBIDE CONTAINING THREE-DIMENSIONAL OBJECTS

The invention relates to a method for producing three-dimensional objects, in particular workpieces, made from silicon-carbide containing compounds, in particular material, by means of additive manufacturing. 1. Method for the production of three-dimensional objects , in particular workpieces , from compounds containing silicon carbide by means of additive manufacturing ,characterized in thatthe silicon carbide-containing compounds are obtained from a precursor granulate by selective, in particular site-selective, energy input.2. Method according to claim 1 , characterized in that the precursor granulate is obtainable from a precursor solution or a precursor dispersion claim 1 , in particular a precursor sol.3. Method according to claim 1 , characterized in that the precursor granulate comprises particles with particle sizes in the range from 0.1 to 150 μm claim 1 , in particular from 0.5 to 100 μm claim 1 , preferably from 1 to 100 μm claim 1 , more preferably from 7 to 70 μm claim 1 , particularly preferably from 20 to 40 μm.4. Method according to claim 1 , characterized in that the particles of the precursor granulate have a D60 value in the range from 1 to 100 μm claim 1 , in particular from 2 to 70 μm claim 1 , preferably from 10 to 50 μm claim 1 , more preferably from 21 to 35 μm.5. Method according to claim 1 , characterized in that the silicon carbide-containing compound is selected from non-stoichiometric silicon carbides and silicon carbide alloys.6. Method according to claim 1 , characterized in that the energy input is effected by means of radiation energy claim 1 , in particular by laser radiation.7. Method according to claim 6 , characterized in that the energy input is effected with a resolution of 0.1 to 150 μm claim 6 , in particular 1 to 100 μm claim 6 , preferably 10 to 50 μm.8. Method according to claim 1 , characterized in that the manufacturing method claim 1 , in particular the additive manufacturing claim 1 , involves selective synthetic ...

RADIOFREQUENCY AND OTHER ELECTRONIC DEVICES FORMED FROM ENHANCED RESONANT FREQUENCY HEXAFERRITE MATERIALS

Radiofrequency and other electronic devices can be formed from textured hexaferrite materials, such as Z-phase barium cobalt ferrite BaCoFeO(CoZ) having enhanced resonant frequency. The textured hexaferrite material can be formed by sintering fine grain hexaferrite powder at a lower temperature than conventional firing temperatures to inhibit reduction of iron. The textured hexaferrite material can be used in radiofrequency devices such as circulators or telecommunications systems. 1. (canceled)2. An enhanced resonant frequency ferrite material comprising a Z-phase barium cobalt hexagonal ferrite material formed from a fine grain hexagonal ferrite powder having a surface area of greater than 8 m/g , the Z-phase barium cobalt hexagonal ferrite material having a resonant frequency peak at a higher frequency as compared to standard hexagonal ferrite powder having a surface area less than 3 m/g.3. The enhanced resonant frequency ferrite material of wherein zeta-milling is used to form the fine grain hexagonal ferrite powder.4. The enhanced resonant frequency ferrite material of wherein the fine grain hexagonal ferrite powder has an average particle size of between 300-600 nm.5. The enhanced resonant frequency ferrite material of wherein the fine grain hexagonal ferrite powder has a surface area of greater than about 15 m/g.6. The enhanced resonant frequency ferrite material of wherein the fine grain hexagonal ferrite powder has a surface area of between 8 and about 15 m/g.7. The enhanced resonant frequency ferrite material of wherein the Z-phase barium cobalt hexagonal ferrite material has the formula BaCoFeO.8. The enhanced resonant frequency ferrite material of wherein the barium cobalt hexagonal ferrite material has a grain size between about five micrometers and one millimeter in diameter.9. An enhanced resonant frequency ferrite material comprising a barium cobalt hexagonal ferrite material formed from fine grain hexagonal ferrite powder having a surface area of at ...

GEL COMPOSITIONS, SHAPED GEL ARTICLES AND A METHOD OF MAKING A SINTERED ARTICLE

Reaction mixtures, gel compositions that are a polymerized product of the reaction mixtures, shaped gel articles that are formed within a mold cavity and that retain the size and shape of the mold cavity upon removal from the mold cavity, and sintered articles prepared from the shaped gel articles are provided. The sintered article has a shape identical to the mold cavity (except in regions where the mold cavity was overfilled) and to the shaped articles but reduced in size proportional to the amount of isotropic shrinkage. Methods of forming the sintered articles also are provided. 1. A method of making a sintered article , the method comprising:providing a mold having a mold cavity;positioning a reaction mixture within the mold cavity, the reaction mixture comprising:{'sub': '2', 'a. 20 to 60 weight percent zirconia-based particles based on a total weight of the reaction mixture, the zirconia-based particles having an average particle size no greater than 100 nanometers and comprising at least 70 mole percent ZrO;'}b. 30 to 75 weight percent of a solvent medium based on the total weight of the reaction mixture, the solvent medium comprising at least 60 percent of an organic solvent having a boiling point equal to at least 150° C.;c. 2 to 30 weight percent polymerizable material based on a total weight of the reaction mixture, the polymerizable material comprising (1) a first surface modification agent having a free radical polymerizable group and a surface modifying group, the first surface modification agent being a first monomer; andd. a photoinitiator for a free radical polymerization reaction;polymerizing the reaction mixture to form a shaped gel article that is in contact with the mold cavity;removing the shaped gel article from the mold cavity, wherein the shaped gel article retains a size and shape identical to the mold cavity (except in regions where the mold cavity was overfilled);forming a dried shaped gel article by removing the solvent medium; ...

Nerve repair conduits incorporating silica fibers

Embodiments of the invention include nerve-repair conduits incorporating mats, sheets, and/or powders of silica fibers and methods for producing such conduits. The silica fibers may be formed via electrospinning of a sol gel produced with a silicon alkoxide reagent, such as tetraethyl ortho silicate, alcohol solvent, and an acid catalyst.

Silica fiber compositions and methods of use

Embodiments of the invention include silica fiber compositions useful for treatment of animal wounds and tissue, as well as for other applications in industry. The fiber compositions may be formed via electrospinning of a sol gel produced with a silicon alkoxide reagent, such as tetraethyl ortho silicate, alcohol solvent, and an acid catalyst.

Process for manufacturing an object from a sol-gel solution

A process for manufacturing an object made of a constituent material obtained from a sol-gel solution, the process including, successively: a) introducing the sol-gel solution into a mold of the object to be manufactured; b) gelling the sol-gel solution; c) drying the gel obtained in b) in the mold, by which the gel is converted into the constituent material of the object, wherein the mold includes a closed chamber and includes a material configured to allow evacuation of gases formed during b) and/or c).

CUTTING TOOL FOR MACHINING ABRASIVE MATERIALS, NOTABLY WOOD-BASED MATERIALS

Cutting tool for machining by removal of matter from abrasive materials such as a material based on wood particles; The invention herein pertains to a cutting tool for machining by removal of matter from abrasive materials, such as wood-based composite materials.The invention notably applies to the production of oxide ceramic cutting platelets intended for the machining of abrasive materials, such as wood-based composite materials.For the description of the state of the art, reference will be made to the documents cited in the list at the end of the description.Machining by removal of chips of abrasive composite materials—notably those based on particles and fibers of wood—gives rise to a mode of wear for the materials most commonly used for these operations, through:But no general wear mechanism has been identified and, accordingly, no particular chemical composition specific to this application has been found.Ceramics, which have mechanical and chemical resistance properties at high temperature, have been studied for the cutting of these abrasive materials generating corrosion. Several works have covered machining trials with oxide [6] and nitride [7] ceramics.As oxide ceramics have the advantage of not being susceptible to oxidation—unlike nitride-based compounds—various ceramic platelets have been produced based on oxides of which the physical characteristics analyzed are shown in the appended table ().This comparative table lists 7 different compositions of oxide ceramics based on AlOand/or 3YZrO, combined at different weighting percentages and resulting from different production processes, so than one can compare the physical characteristics:The data highlight the very wide diversity of these physical characteristics, but do not allow deduction of wear resistance when these ceramics are the material of platelets used for machining abrasive or highly-abrasive materials.Pure AlOceramic has the greatest hardness, which would allow one to expect the best wear ...

Additive manufacturing process for producing ceramic articles using a sol containing nano-sized particles

The present invention relates to a process for producing a ceramic article, the process comprising the steps of providing a printing sol, the printing sol comprising solvent, nano-sized particles, radiation curable monomer(s) and photoinitiator, the printing sol having a viscosity of less than 500 mPa*s at 23° C., processing the printing sol as construction material in an additive manufacturing process to obtain a 3-dim article being in a gel state, the 3-dim article having a Volume A, transferring the 3-dim article being in a gel state to a 3-dim article being in an aerogel state, heat treating the 3-dim article to obtain a sintered 3-dim ceramic article, the ceramic article having a Volume F, Volume A of the 3-dim article in a gel state being more than 500% of Volume F of the ceramic article in its sintered state. The invention also relates to a ceramic article obtainable according to such a process. The ceramic article can have the shape of a dental or orthodontic article.

Precursor solution and method for the preparation of a lead-free piezoelectric material

The present disclosure relates to a precursor solution for the preparation of a ceramic of the BZT-αBXT type, where X is selected from Ca, Sn, Mn, and Nb, and a is a molar fraction selected in the range between 0.10 and 0.90, said solution comprising: 1) at least one barium precursor compound; 2) a precursor compound selected from the group consisting of at least one calcium compound, at least one tin compound, at least one manganese compound, and at least one niobium compound; 3) at least one anhydrous precursor compound of zirconium; 4) at least one anhydrous precursor compound of titanium; 5) a solvent selected from the group consisting of a polyol and mixtures of a polyol and a secondary solvent selected from the group consisting of alcohols, carboxylic acids, esters, ketones, ethers, and mixtures thereof; and 6) a chelating agent, as well as method of using the same.

Ceramic Grains and Method for Their Production

The disclosure relates to sintered ceramic grains comprising 3-55 wt. % alumina, 40-95 wt. % zirconia and 1-30 wt. % of one or more other inorganic components. 1. Sintered ceramic grains comprising 3-55 wt. % alumina , 40-95 wt. % zirconia and one or more other inorganic components in a total relative amount of 1-30 wt. % , wherein the grains have a rare earth metal content of 0.3-10 wt. % , expressed as rare earth metal oxide , and the grains have a yttrium content of at least 0.1 wt. % , expressed as YO.2. Sintered ceramic grains according to claim 1 , wherein the grains are elongated and/or rounded grains when observed at the macroscopic level.3. (canceled)4. Sintered ceramic grains according to having a striated or grooved surface.5. Sintered ceramic grains according to having on average a sphericity—defined as shortest projected size to longest projected size—in the range of 0.65-0.9 claim 1 , as determined by a Camsizer®.6. (canceled)7. (canceled)8. (canceled)9. Sintered ceramic grains according to claim 1 , wherein the rare earth metal content claim 1 , expressed as its oxide claim 1 , is 0.3-5 wt. %.10. Sintered ceramic grains according to claim 1 , wherein the yttrium content claim 1 , expressed as YO claim 1 , is 6 wt. % or less.11. Sintered ceramic grains according to claim 1 , wherein the yttrium content claim 1 , expressed as YO claim 1 , is at least 1.5 wt. % claim 1 , and wherein the grains comprise 0-2 wt. % cerium claim 1 , expressed as its oxide.12. (canceled)13. (canceled)14. (canceled)15. Sintered ceramic grains according to claim 1 , wherein the grains are obtained by a method for preparing ceramic grains comprising:making a slurry comprising alumina, zirconia and a gelling agent;making droplets of the slurry;introducing the droplets in a liquid gelling-reaction medium wherein the droplets are gellified, wherein the liquid gelling-reaction medium comprises at least one component selected from the group of a rare earth metal ion and an alkaline ...

PREPARATION METHOD OF ELECTROLYTES FOR SOLID OXIDE FUEL CELLS

The preparation method of electrolytes provided by the present invention involves applications of a first solid oxide powder and a second solid oxide powder, both of which are prepared by using a sol-gel process and a calcination process. Each of the first and second solid oxide powders is a Perovskite-type oxide. After the first and second solid oxide powders are readily mixed, they are compressed into a pellet and then sintered to prepare the afore-mentioned electrolytes for SOFC. It is found in the present invention that by mixing and compressing different solid oxide powders, the solid oxide powder having smaller particle size can fill into the gaps of the other solid oxide powder. After the pellet is sintered, the density of the product is significantly improved. 1. A preparation method of electrolytes for solid oxide fuel cells , involving applications of a first solid oxide powder and a second solid oxide powder , the first and second solid oxide powders are Perovskite type oxides with different chemical formulas , each of the first solid oxide powder and the second solid oxide powder being prepared by a sol-gel process and a subsequent calcination process , the preparation method being characterized in that:the first solid oxide powder and the second solid oxide powder are uniformly mixed and then pressed into a pellet, which is then sintered to yield the electrolyte for the solid oxide fuel cell.2. The preparation method of claim 1 , wherein the first and second solid oxide powders have different average particle diameters.3. The preparation method of claim 1 , wherein the first and second solid oxide powders are composed of different chemical elements.4. The preparation method of claim 1 , wherein the first and second solid oxide powders are composed of same chemical elements claim 1 , a ratio between at least two of the chemical elements in the first solid oxide powder is different from that between the chemical elements of the same kind in the second ...

Ceramic Grains and Method for Their Production

The disclosure herein relates to a method for preparing ceramic grains comprising: 1. Method for preparing ceramic grains comprisingmaking a slurry comprising inorganic particles and a gelling agent;making droplets of the slurry;introducing the droplets in a liquid gelling-reaction medium wherein the droplets are gellified;deforming the droplets before, during or after gellification by impacting the droplets on a deformation mechanism arranged for deforming the droplets upon receiving of the droplets;drying the gellified deformed droplets, thereby obtaining dried grains and sintering the dried grains, thereby obtaining the ceramic grains.2. Method according to claim 1 , wherein the droplets are introduced in the gelling-reaction medium by letting them fall through air or another gaseous atmosphere into the gelling-reaction medium.3. Method according to claim 1 , wherein the deformation mechanism is present at the surface of the gelling-reaction medium or in the gelling-reaction medium.4. Method according to claim 3 , wherein the deformation mechanism comprises a perforation claim 3 , a grating claim 3 , a grid claim 3 , or a mesh.5. (canceled)6. (canceled)7. Method according to claim 1 , wherein the gelling agent is an anionic polymer claim 1 , and wherein the gelling-reaction medium comprises a multivalent cation which reacts with the anionic polymer claim 1 , thereby gellifying the droplets.8. (canceled)9. (canceled)10. (canceled)11. Method according to claim 1 , wherein the slurry comprises particles of a silicate; carbide particles; nitride particles; boride particles; or calcium carbonate particles.12. Method according to claim 11 , wherein the grains comprise 30-100 wt. % aluminium oxide.13. Method according to claim 12 , wherein the grains comprises50-90 wt. % aluminium oxide,0-50 wt. % zirconium oxide,the sum of both of the aluminium oxide and the zirconium oxide being 70-100 wt. %.14. (canceled)15. (canceled)16. Sintered ceramic grains claim 12 , wherein ...

Method for collecting living tissue

A biological tissue collection method includes: preparing a component, the component including a first surface, a second surface, multiple (n≥2) holes for passing air from the first surface toward the second surface, and a wall formed between the holes, and an end portion of the wall on a first surface side being rounded and formed as a curved surface; sucking a biological tissue with a dimension of equal to or greater than 0.5 mm and equal to or less than 100 mm in a maximum direction in contact with the holes on the first surface side, thereby collecting the biological tissue by means of the holes; and taking equal to or greater than 50% and equal to or less than 90% of an area of the biological tissue as a total area of the holes used for collection.

A COMPOSITE MATERIAL PART

A part made of composite material includes fiber reinforcement including silicon carbide fibers presenting an oxygen content less than or equal to 1% in atomic percentage; and a matrix present in the pores of the fiber reinforcement and including at least one sintered silicate phase including at least one rare earth silicate, mullite, or a mixture of mullite and of at least one rare earth silicate, the matrix including at least a first phase including mullite and a second phase, different from the first phase, including at least one rare earth silicate. 1. A part made of composite material comprising:fiber reinforcement comprising silicon carbide fibers presenting an oxygen content less than or equal to 1% in atomic percentage; anda matrix present in the pores of the fiber reinforcement and comprising at least one sintered silicate phase comprising at least one rare earth silicate, mullite, or a mixture of mullite and of at least one rare earth silicate, the matrix comprising at least a first phase comprising mullite and a second phase, different from the first phase, comprising at least one rare earth silicate.2. A part according to claim 1 , wherein said rare earth silicate has the chemical formula: RESiOor RESiO claim 1 , where RE designates a rare earth element.3. A part according to claim 2 , wherein RE is selected from: Y; Yb; and Lu.4. (canceled)5. A part according to claim 1 , wherein the first phase is situated between the silicon carbide fibers and the second phase.6. A part according to claim 1 , wherein the matrix comprises:at least the silicate phase comprising at least one rare earth silicate, mullite, or a mixture of mullite and of at least one rare earth silicate; andan additional matrix phase made of ceramic material, different from the silicate phase, situated between the silicon carbide fibers and the silicate phase.7. A part according to claim 1 , said part constituting a turbine engine part.8. A part according to claim 6 , the part constituting ...

Composite materials including ceramic particles and methods of forming the same

In some examples, a technique for forming a partially densified preform including ceramic particles may include mixing a densifying agent with metal oxide particles or metal oxide precursor to form a blended densifying agent, infiltrating the blended densifying agent in to a porous preform, pyrolyzing the infiltrated preform to convert the densifying agent to carbon and form a partially densified preform, and heat treating the partially densified preform to react at least some of the carbon with the metal oxide particles to form ceramic particles. Composite materials formed from porous preforms in which a blended densifying agent is disposed in pores of the preform are also described.

SINTERED PLATELET-LIKE RANDOMLY SHAPED ABRASIVE PARTICLES AND METHOD OF MAKING SAME

The present invention relates to sintered platelet-like randomly shaped abrasive particles based on alpha alumina having a hardness Hof at least 20 GPa and a crystal structure with an average crystal size between 100 nm and 300 nm, whereby the abrasive particles comprise a body having a first surface and a second surface opposite to the first surface, both surfaces are separated from each other by a randomly shaped sidewall having a thickness (T) between 20 μm and 500 μm. 1. Abrasive particles , comprisinga body having a first surface and a second surface opposite to the first surface, whereinthe first and second surfaces are separated by a randomly shaped sidewall having a thickness (T) between 20 μm and 500 μm,the abrasive particles have a crystal structure with an average crystal size between 100 and 300 nm, andthe crystal structure comprises α-alumina crystals.2. The abrasive particles of claim 1 , whereinthe abrasive particles have a chemical composition comprising of between 1% and 20% by weight zirconia, andat least 50% by weight of the zirconia are present in the tetragonal modification.3. The abrasive particles of claim 2 , whereinthe crystal structure comprises a dominant continuous phase of α-alumina crystals and a secondary phase of substantially intergranular oriented zirconia crystals, andthe crystal size of the zirconia crystals is less than 100 nm.4. The abrasive particles of claim 2 , wherein the chemical composition additionally comprises between 0.5% and 5% by weight MgO.5. The abrasive particles of claim 2 , wherein the chemical composition comprises between 1% and 10% by weight zirconia.6. The abrasive particles of claim 2 , wherein at least 75% by weight of the zirconia is present in the tetragonal modification.7. The abrasive particles of claim 2 , wherein the average crystal size of the alumina and zirconia crystals is below 250 nm.8. The abrasive particles of claim 1 , wherein the abrasive particles have a circularity (C) of more than 0.60.9 ...

Extruded Ceramic Nanofibers and Derived Materials

The present invention relates to gels and processes for making bundles of aligned ceramic nanofibers, ceramic nanostructures made by such processes, and methods of using such ceramic nanostructures. Such process is templated via block copolymer self-assembly but does not require any post processing thermal and/or solvent annealing steps. As a result, such process is significantly more efficient and scalable than other processes that are templated via block copolymer self-assembly. The resulting fibers are aligned according to the direction of deposition, making steps where individual fibers are bundled unnecessary. 2. The process of wherein claim 1 , based on total gel weight claim 1 , said gel comprises:a) from about 11% to about 40% of said block copolymer;b) from about 8% to about 34% of said preceramic polymer;c) from about 30% to 50% about of said amphilic solvent; andd) from about 13% to about 25% of a plasticizer.3. The process of wherein claim 2 , based on total gel weight claim 2 , said gel comprises:a) from about 22% to about 37% of said block copolymer;b) from about 15% to about 25% of said preceramic polymer;c) from about 35% to 46% about of said amphilic solvent; andd) from about 14% to about 20% of a plasticizer.4. The process of wherein claim 3 , based on total gel weight claim 3 , said gel comprises:a) from about 25% to about 35% of said block copolymer;b) from about 19% to about 21% of said preceramic polymer;c) from about 40% to 45% about of said amphilic solvent; andd) from about 16% to about 19% of a plasticizer.5. The process according to wherein said cured extruded filament is produced by extruding a gel at a pressure of from about 500 kPa to about 4000 kPa to form an extruded filament and then thermally curing said extruded filament at a temperature of about 70° C. to about 250° C. to form a cured extruded filament and wherein said cured extruded filament is pyrolyzed at a temperature of about 600° C. to about 900° C.8. The process according ...

ABRASIVE ARTICLE INCLUDING SHAPED ABRASIVE PARTICLES

Various shaped abrasive particles are disclosed. Each shaped abrasive particle includes a body having at least one major surface and a side surface extending from the major surface. 1. A method of making a shaped abrasive particle comprising:forming a mixture;disposing the mixture into a plurality of openings of a production tool, wherein disposing includes overfilling a portion of the openings of the production tool with the mixture;removing the production tool and creating precursor shaped abrasive particles, wherein a majority of the precursor shaped abrasive particles comprise a flange from the overfilling of the mixture.2. The method of claim 1 , wherein the mixture comprises a ceramic material and a liquid.3. The method of claim 2 , wherein the ceramic material comprises an oxide claim 2 , a nitride claim 2 , a carbide claim 2 , a boride claim 2 , an oxycarbide claim 2 , an oxynitride claim 2 , and a combination thereof.4. The method of claim 2 , wherein the ceramic material comprises alumina.5. The method of claim 1 , wherein the mixture comprises a solids content of at least about 25 wt % and not greater than about 75 wt % for a total weight of the mixture.6. The method of claim 1 , wherein the mixture comprises a liquid content of at least about 25 wt % and not greater than about 75 wt % for a total weight of the mixture.7. The method of claim 1 , wherein the mixture comprises a storage modulus of at least about 1×104 Pa.8. The method of claim 1 , wherein the mixture comprises a viscosity of at least about 2×103 Pa.9. The method of claim 1 , wherein the mixture comprises not greater than about 30 wt % organic material for the total weight of the mixture.10. The method of claim 1 , wherein each of the plurality of openings of the production tool have a two-dimensional shape as viewed in a plane defined by the length (l) and width (w) of the production tool.11. The method of claim 10 , wherein the two-dimensional shape comprises polygons claim 10 , ellipsoids ...

AEROGELS, CALCINED AND CRYSTALLINE ARTICLES AND METHODS OF MAKING THE SAME

Aerogel, calcined articles, and crystalline articles comprising ZrO. Exemplary uses of the crystalline metal oxide articles include dental articles (e.g., restoratives, replacements, inlays, onlays, veneers, full and partial crowns, bridges, implants, implant abutments, copings, anterior fillings, posterior fillings, and cavity liner, and bridge frameworks) and orthodontic appliances (e.g., brackets, buccal tubes, cleats, and buttons). 1. A crack-free , calcined metal oxide article having x , y , and z dimensions of at least 5 mm , a density in a range from 30 to 95 percent of theoretical density , and an average connected pore size in a range from 10 nm to 100 nm , wherein at least 70 mole percent of the metal oxide is crystalline ZrO , and wherein the crystalline ZrOhas an average grain size less than 100 nm.2. The crack-free claim 1 , calcined metal oxide of claim 1 , wherein the crack-free claim 1 , calcined metal oxide article has x claim 1 , y claim 1 , and z dimensions of at least 10 mm.3. The crack-free claim 1 , calcined metal oxide of claim 1 , wherein at least 75 mole percent of the crystalline metal oxide present in the crack-free claim 1 , calcined metal oxide article is crystalline ZrO.4. The crack-free claim 1 , calcined metal oxide of claim 1 , wherein the crystalline metal oxide comprises in a range from 1 to 15 (in some embodiments claim 1 , 1 to 9 claim 1 , 1 to 5 claim 1 , 6 to 9 3.5 to 4.5 claim 1 , or even 7 to 8) mole percent of the crystalline metal oxide is YO.5. The crack-free claim 1 , calcined metal oxide of claim 1 , wherein the crystalline metal oxide further comprises at least one of YOor LaO.6. The crack-free claim 1 , calcined metal oxide of claim 1 , wherein the crystalline metal oxide further comprises at least one of CeO claim 1 , PrO claim 1 , NdO claim 1 , PmO claim 1 , SmO claim 1 , EuO claim 1 , GdO claim 1 , TbO claim 1 , DyO claim 1 , HoO claim 1 , ErO claim 1 , TmO claim 1 , YbO claim 1 , FeO claim 1 , MnO claim 1 , CoO ...

METAL OXIDE CERAMIC NANOMATERIALS AND METHODS OF MAKING AND USING SAME

Provided are metal oxide ceramic materials and intermediate materials thereof (e.g., nanozirconia gels, nanozirconia green bodies, pre-sintered ceramic bodies, zirconia dental ceramic materials, and dental articles). The nanozirconia gels are formable gels. Also provided are methods of making and using the metal oxide materials and intermediate materials. The nanozirconia gels can be made using, for example, osmotic processing. The nanozirconia gels can be used to make nanozirconia green bodies, pre-sintered ceramic bodies, zirconia dental ceramic materials, and dental article. The nanozirconia green bodies, pre-sintered ceramic bodies, zirconia dental ceramic materials, and dental articles have desirable properties (e.g., optical properties and mechanical properties). 1. A gel comprising a plurality of zirconia nanoparticles and water , wherein the zirconia nanoparticles have an average size of 10 to 30 nm , 95% or more of the zirconia nanoparticles by volume have a size of 45 nm or less , the zirconia nanoparticles are present at 70 to 85% by weight based on the total weight of the gel , and the gel is a formable gel.2. The gel of claim 1 , wherein:i) 99% of nanoparticles by volume have a size less than 60 nm±10 nm;ii) 95% of nanoparticles by volume have a size less than 40 nm±5 nm;iii) 50% of nanoparticles by volume have a size less than 20 nm±5 nm; andiv.) 5% of nanoparticles by volume have a size less than 12 nm±3 nm.3. The gel of claim 1 , wherein 95% or greater by volume of the zirconia nanoparticles comprise 1 to 5 crystallites.4. The gel of claim 1 , wherein the gel further comprises a processing agent.5. The gel of claim 4 , wherein the processing agent is selected from the group consisting of colloid stabilizers claim 4 , particle interaction strengthening agents claim 4 , and combinations thereof.6. (canceled)7. The gel of claim 5 , wherein the colloid stabilizer is selected from the group consisting of organocarboxylic acids and salts thereof claim 5 , ...

ENHANCED CERAMIC COATING

The present invention relates to an enhanced ceramic coating, ECC, composition comprising a non-stick ceramic coating composition, CCC, and 0.2 wt %-2 wt % diamond additive, DA with wt % compared with the total weight compared to the ECC composition. It also relates to a method of coating an artefact with the ECC, and an artefact provided 5 with a dry film coating containing an ECC prepared using an ECC composition of the invention. An artefact coated with the ECC has the combined advantages of durable non-stick, scratch resistance and abrasion resistance. 119-. (canceled)20. An enhanced ceramic coating , ECC , composition for providing an enhanced non-stick ceramic coating on an artefact , the ECC composition comprising:a sol-gel type ceramic coating composition comprising a silane or an oligomer thereof and silica, and0.2 wt %-2 wt % of a diamond additive, with wt % compared with the total weight of the enhanced ceramic coating ECC composition,characterised in that the ECC has a non-stick durability of a least 17 cycles, wherein the non-stick durability of a coating is measured by determining the number of cycles required to reduce the non-stick grade of the coating from 5 to 1, wherein the non-stick grade is determined by performing a Fried Egg Test according to the Cookware Manufacturers Association Standard before and after each cycle and wherein each cycle comprises in sequence an ENV12875-1:1998 standard Dishwasher test, a first temperature treatment (260° C. for 10 min), quenching, and a second temperature treatment (260° C. for 10 min).21. The ECC composition according to claim 20 , wherein the sol-gel type ceramic coating composition further comprises a ceramic powder that emits far infrared radiation and anions.22. The ECC composition according to claim 20 , wherein the sol-gel type ceramic coating composition is present at more than 90 wt % claim 20 , with wt % compared with the total weight of the ECC composition.23. The ECC composition according to ...

Superhydrophobic and Oleophobic Ceramic Polymer Composite Coating

An article having a superhydrophobic or oleophobic ceramic polymer composite surface is formed by the coating of the surface with a fluid comprising a polymer, copolymer, or polymer precursor and a plurality of glass, ceramic, or ceramic-polymer particles. The particles have fluorinated surfaces and at least a portion of the polymer's repeating units that are fluorinated or perfluorinated. The composite can be a cross-linked polymer. 1. A ceramic-polymer composite , comprising a polymer matrix and dispersed glass , ceramic , and/or ceramic-polymer particles , wherein the glass , ceramic , and ceramic-polymer particles display an aspect ratio of 1:1 to 1:500 and are 1 nm to 100 microns in an axial dimension , wherein the glass , ceramic , and ceramic polymer have a fluorinated surface , and wherein the polymer matrix comprises a polymer or copolymer with at least one fluorinated repeating unit.2. The ceramic-polymer composite of claim 1 , wherein the glass claim 1 , ceramic claim 1 , and/or ceramic-polymer particles are 10 to 80 weight percent of the ceramic-polymer composite.3. The ceramic-polymer composite of claim 1 , wherein the glass claim 1 , ceramic claim 1 , and/or ceramic-polymer particles comprise ZnO claim 1 , CdO claim 1 , SiO claim 1 , GeO claim 1 , TiO claim 1 , ZrO claim 1 , CeO claim 1 , SnO claim 1 , BeO claim 1 , AlO claim 1 , corundum claim 1 , boehmite claim 1 , AlO(OH) claim 1 , MgO claim 1 , ZrOInO claim 1 , LaO claim 1 , FeO claim 1 , CuO claim 1 , TaZOS claim 1 , NbO claim 1 , VO claim 1 , MoO claim 1 , WO claim 1 , indium-tin-oxide (ITO) claim 1 , antimony-tin-oxide (ATO) claim 1 , fluorine-doped tin oxide (FTO) claim 1 , Perovskites including BaTiOand PbTiO claim 1 , chalcogenides claim 1 , CdS claim 1 , ZnS claim 1 , PbS claim 1 , AgZS claim 1 , GaSe claim 1 , CdSe claim 1 , ZnSe claim 1 , ZnTe claim 1 , CdTe claim 1 , AgCl claim 1 , AgBr claim 1 , AgI claim 1 , CuCl claim 1 , CuBr claim 1 , CdI claim 1 , PbI claim 1 , CdC claim 1 , SiC ...

METHOD FOR MAKING CERAMIC MATRIX COMPOSITE ARTICLES

A method of forming a composite article includes impregnating an inorganic fiber preform with a slurry composition. The slurry composition includes a particulate, a solvent, and a pre-gellant material. Gelling of the pre-gellant material in the slurry composition is initiated to immobilize the particulate and yield a gelled article, and substantially all solvent is removed from the gelled article to form a green composite article. The green composite article is then infiltrated with a molten infiltrant to form the composite article. 1. An article comprising an inorganic fiber preform impregnated with a slurry composition , wherein the slurry composition comprises a particulate , a solvent , and a pre-gellant material , wherein the pre-gellant material comprises a monomer that is polymerizable to form a gel.2. The article according to claim 1 , wherein the slurry composition further comprises a free radical initiator selected from the group consisting of peroxides claim 1 , persulfates claim 1 , perchlorates claim 1 , amines claim 1 , azo compounds claim 1 , and combinations thereof.3. The article according to claim 1 , wherein the monomer comprises one or more functional groups selected from the group consisting of acrylates claim 1 , acrylamides claim 1 , vinyls claim 1 , allyls claim 1 , and combinations thereof.4. The article according to claim 1 , where the particulate in the slurry is selected from the group consisting of aluminum nitride claim 1 , aluminum diboride claim 1 , boron carbide claim 1 , aluminum oxide claim 1 , mullite claim 1 , zirconium oxide claim 1 , carbon claim 1 , silicon carbide claim 1 , silicon nitride claim 1 , transition metal nitrides claim 1 , transition metal borides claim 1 , rare earth oxides claim 1 , and combinations thereof.5. The article according to claim 1 , wherein the solvent comprises water.6. The article according to claim 1 , wherein slurry composition is at a temperature of about 30° C. to about 80° C.7. The article ...

PROCESSING OF NON-OXIDE CERAMICS FROM SOL-GEL METHODS

A general procedure applied to a variety of sol-gel precursors and solvent systems for preparing and controlling homogeneous dispersions of very small particles within each other. Fine homogenous dispersions processed at elevated temperatures and controlled atmospheres make a ceramic powder to be consolidated into a component by standard commercial means: sinter, hot press, hot isostatic pressing (HIP), hot/cold extrusion, spark plasma sinter (SPS), etc. 1. A method , comprising:a) forming an intimate mixture of an inorganic oxide and an organic polymer,b) reaction heat treating the mixture to form particles of a non-oxide ceramic; and 'wherein the solid ceramic object is characterized by a domain size of 100 nm or less.', 'c) consolidating the particles into a solid ceramic object,'}2. A method according to claim 1 , wherein the non-oxide ceramic comprises a carbide.3. A method according to claim 1 , wherein the non-oxide ceramic comprises a nitride.4. A method according to claim 1 , wherein the non-oxide ceramic comprises a boride.5. A method according to claim 1 , wherein the organic polymer comprises a polymer of an aldehyde and a mono- claim 1 , di- claim 1 , or trihydroxy substituted aromatic ring.6. A method according to claim 5 , wherein the polymer is a polymer of trihydroxybenzene and formaldehyde.7. A method according to claim 5 , wherein the polymer is a polymer of dihydroxybenzene and formaldehyde.8. A method according to claim 1 , wherein step a) comprisesa1) forming a first sol comprising an inorganic gel intermediate in a solution;a2) forming a second sol comprising an organic gel intermediate in the solution;a3) further reacting the solution until at least one of the first sol and second sol forms a sol gel comprising the respective inorganic oxide or organic polymer; anda4) removing the solvent from the solution to form the intimate mixture.9. A method according to claim 1 , wherein step a) comprisesa1) reacting precursors of a first sol in a ...

POROUS ALUMINA CERAMIC WARE AND PREPARATION METHOD THEREOF

Provided are a porous alumina ceramic ware and a preparation method thereof. The porous alumina ceramic material comprises the following components at the following percentages by mass: 40%-60% of alumina, 30%-50% of diatomaceous earth, and 6%-15% of silicon sol, wherein silicon dioxide makes up 25%-30% of the mass of the silicon sol. 1. A porous alumina ceramic , wherein a raw material of the porous alumina ceramic comprises the following components: by weight percentage , 40% to 60% of alumina , 30% to 50% of diatomite , and 6% to 15% of silica sol , wherein a weight percentage of silica in the silica sol is 25% to 30%.2. A method of preparing a porous alumina ceramic , comprising the following steps of:weighing the following components, by weight percentage, 40% to 60% of alumina, 30% to 50% of diatomite, and 6% to 15% of silica sol, wherein a weight percentage of silica in the silica sol is 25% to 30%;pre-treating the diatomite with a sealing agent, wherein the sealing agent is paraffin wax or polyethylene glycol;mixing a pretreated diatomite, the silica sol, and the alumina in water to obtain a mixed slurry;drying and crushing the mixed slurry to obtain a composite powder;molding the composite powder to obtain a green body; andsintering the green body at a temperature ranging from 1450° C. to 1600° C. for 1 hour to 5 hours to obtain the porous alumina ceramic.3. The method of preparing the porous alumina ceramic according to claim 2 , wherein the step of pre-treating the diatomite with the sealing agent comprises:dissolving the sealing agent in a solvent to obtain a pretreatment solution, wherein a mass ratio of the sealing agent and the diatomite ranges from 10 to 25:100;adding the pretreatment solution after the diatomite is vacuumized until a vacuum degree ranges from 5 Pa to 10 Pa, and then obtaining the pretreated diatomite after filtration and drying.4. The method of preparing the porous alumina ceramic according to claim 3 , wherein a weight percentage ...

Method for synthesizing high-purity ultrafine ZrC-SiC composite powder

A method for synthesizing high-purity ultrafine ZrC—SiC composite powder is provided. The high-purity ultrafine ZrC—SiC composite powder is prepared by utilizing zirconium silicate only or zirconium silicate with one or both of zirconium oxide or silica sol as a zirconium source and a silicon source material, utilizing sucrose or glucose as a carbon source material, and utilizing acrylamide monomer and N,N′-methylene diacrylamide cross-linking agent as a gel material. 1. A method for synthesizing high-purity ultrafine ZrC—SiC composite powder , comprising: utilizing zirconium silicate only or zirconium silicate with one or both of zirconium oxide or silica sol as a zirconium source and silicon source material , utilizing sucrose or glucose as a carbon source material , and utilizing acrylamide monomer and N ,N′-methylene diacrylamide cross-linking agent as a gel material.2. The method for synthesizing high-purity ultrafine ZrC—SiC composite powder claim 1 , as recited in claim 1 , wherein in utilizing the zirconium silicate only or the zirconium silicate with one or both of the zirconium oxide or the silica sol as the zirconium source and silicon source material claim 1 , a mole ratio of a sum of Zr and Si to C is at a range of 1:3.5-1:4.3. The method for synthesizing high-purity ultrafine ZrC—SiC composite powder claim 1 , as recited in claim 1 , comprising steps of:(1) mixing the zirconium source and silicon source material and the silicon source, adding deionized water and dispersing agent and mixed grinding to obtain aqueous slurries;(2) adding the gel material of the acrylamide monomer and the N,N′-methylene diacrylamide cross-linking agent into the aqueous slurries obtained in the step (1); mixed grinding to obtain gelation aqueous slurries;(3) gel solidifying the aqueous slurries at a normal position;(4) dewatering drying in an oven and performing pre-carbonizing treatment, then sending into a carbon-pipe heating furnace to perform a carbothermal reduction ...

Process for Producing a Silicon Carbide-Containing Body

The present invention relates to a process for producing a silicon carbide-containing body ( 100 ), characterized in that the process has the following process steps: a) providing a mixture ( 16 ) comprising a silicon source and a carbon source, the silicon source and the carbon source being present together in particles of a solid granular material; b) arranging a layer of the mixture ( 16 ) provided in process step a) on a carrier ( 12 ), the layer of the mixture ( 16 ) having a predefined thickness; and c) treating the mixture ( 16 ) arranged in process step b) over a locally limited area with a temperature within a range from ≥1400° C. to ≤2000° C. according to a predetermined three-dimensional pattern, the predetermined three-dimensional pattern being selected on the basis of the three-dimensional configuration of the body ( 100 ) to be produced. Such a process allows simple and inexpensive production even of complex structures from silicon carbide.

Piezoelectric-effect-induced heterogeneous electrochemical reactions

Domain polarization can affect the surface properties of ferroelectric oxides. Mechanical energy is exploited to enable direct chemical reactions on the ferroelectric surface by the piezoelectric effect. Transient local electrostatic potentials on ferroelectric surface evoked by external mechanical excitation through the piezoelectric effect can activate redox reactions in solution at predefined domain locations. Conversion of mechanical via electrical to chemical energy can thereby be realized.

PROCESS FOR THE FABRICTION OF DENTAL RESTORATIONS

Dental restorations are created by preparing a hydrocolloid mold for such dental appliances as crowns and bridges. A slurry of zirconia powder and 3-O-acryloyl-D-glucose is prepared. The slurry is gelcast in the hydrocolloid mold with polymerization of the 3-O-acryloyl-D-glucose to a green body. The green body is dried and machined to the form of the dental restoration. The polymerized 3-O-acryloyl-D-glucose is then burned from the machined green body. The remaining zirconia body in the form of the dental restoration is then sintered to form the finished device. 1. A process for creating dental restorations , comprisingcreating a mold for the restoration;preparing a slurry of zirconia powder and a monosaccharide based monomer;gelcasting the slurry with polymerization of the monosaccharide based monomer to a green body in the mold of the dental restoration;sintering the green body to form the dental restoration.2. The process of claim 1 , the monosaccharide based monomer being 3-O-acryloyl-D-glucose.3. The process of claim 2 , preparing the slurry further including water claim 2 , a dispersant claim 2 , a polymerization activator and a polymerization initiator.4. The process of further comprisingspraying the mold with the initiator before gelcasting the slurry.5. The process of further comprisingproviding a barrier to oxygen on the slurry in the mold.6. The process of further comprisingdrying the green body before sintering in a climate chamber including presenting the green body to a humidity of 85% in the climate chamber and reducing the humidity in the climate chamber by 1.5% per hour to a humidity in the climate chamber of 60%.7. The process of claim 6 , drying the green body further including bringing the temperature by incremental amounts to 50° C. continuously during reduction of the humidity in the climate chamber.8. The process of claim 7 , drying the green body further including retaining the humidity in the climate chamber at 60% and the temperature at 50° ...

AEROGELS, CALCINED AND CRYSTALLINE ARTICLES AND METHODS OF MAKING THE SAME

Aerogel, calcined articles, and crystalline articles comprising ZrO. Exemplary uses of the crystalline metal oxide articles include dental articles (e.g., restoratives, replacements, inlays, onlays, veneers, full and partial crowns, bridges, implants, implant abutments, copings, anterior fillings, posterior fillings, and cavity liner, and bridge frameworks) and orthodontic appliances (e.g., brackets, buccal tubes, cleats, and buttons). 120.-. (canceled)21. A monolithic aerogel comprising organic material and crystalline metal oxide particles , wherein the crystalline metal oxide particles are in a range from 3 to 20 volume percent , based on the total volume of the monolithic aerogel , wherein at least 70 mole percent of the crystalline metal oxide is ZrO.22. The monolithic aerogel of claim 21 , wherein the crystalline metal oxide particles are in a range from 1 to 15 mole percent of the crystalline metal oxide is YO.23. The monolithic aerogel of claim 21 , wherein the crystalline metal oxide particles have an average primary particle size in a range of 2 nanometers to 50 nanometers.24. The monolithic aerogel of claim 21 , wherein the crystalline material further comprises at least one of YOor LaO.25. The monolithic aerogel of claim 21 , wherein the ZrOis all tetragonal or cubic.26. The aerogel of claim 21 , wherein the organic content in a range of 3 to 30 percent by weight claim 21 , based on the total weight of the aerogel.27. The aerogel of claim 21 , wherein the aerogel has a surface area in a range of 100 m/gram to 300 m/gram.28. The aerogel of claim 21 , wherein an average connected pore size is in a range of 10 nanometers to 20 nanometers.29. The aerogel of claim 21 , wherein the aerogel is crack-free.30. The aerogel of claim 21 , wherein the organic material content is in a range of 3 to 30 weight percent claim 21 , based on a total weight of the aerogel.31. The aerogel of claim 21 , wherein the crystalline metal oxide particles further comprise at least ...

COMPOSITION FOR FORMING Mn-DOPED PZT-BASED PIEZOELECTRIC FILM AND Mn-DOPED PZT-BASED PIEZOELECTRIC FILM

A composition for forming a PZT-based piezoelectric film formed of Mn-doped composite metal oxides is provided, the composition including: PZT-based precursors containing metal atoms configuring the composite metal oxides; a diol; and polyvinylpyrrolidone, in which when a metal atom ratio in the composition is shown as Pb:Mn:Zr:Ti, the PZT-based precursors are contained so that a metal atom ratio of Pb is satisfied to be from 1.00 to 1.20, a metal atom ratio of Mn is satisfied to be equal to or greater than 0.002 and less than 0.05, a metal atom ratio of Zr is satisfied to be from 0.40 to 0.55, a metal atom ratio of Ti is satisfied to be from 0.45 to 0.60, and the total of Zr and Ti in a metal atom ratio is 1. 1. A composition for forming a Mn-doped PZT-based piezoelectric film formed of Mn-doped composite metal oxides , the composition comprising:PZT-based precursors containing metal atoms configuring the composite metal oxides;a diol; andpolyvinylpyrrolidone,wherein when a metal atom ratio in the composition is shown as Pb:Mn:Zr:Ti, the PZT-based precursors are contained so that Pb is satisfied to be from 1.00 to 1.20, Mn is satisfied to be equal to or greater than 0.002 and less than 0.05, Zr is satisfied to be from 0.40 to 0.55, Ti is satisfied to be from 0.45 to 0.60, and the total of ratio of Zr and Ti in a metal atom ratio is 1,a concentration of the PZT-based precursor in 100 mass % of the composition is from 17 mass % to 35 mass % in terms of an oxide concentration,a rate of diol in 100 mass % of the composition is from 16 mass % to 56 mass %, anda molar ratio of polyvinylpyrrolidone to 1 mole of the PZT-based precursor is 0.005 moles to 0.25 moles, in terms of monomers.2. A Mn-doped PZT-based piezoelectric film formed of Mn-doped composite metal oxides claim 1 , which is formed using the composition according to by using a CSD method and represented by a general formula PbMnZrTiO claim 1 ,wherein when the total mole number of Zr and Ti in the composite ...

NANOPOROUS SELECTIVE SOL-GEL CERAMIC MEMBRANES, SELECTIVE-MEMBRANE STRUCTURES, AND RELATED METHODS

Nanoporous selective sol-gel ceramic membranes, selective-membrane structures, and related methods are described. Representative ceramic selective membranes include ion-conductive membranes (e.g., proton-conducting membranes) and gas selective membranes. Representative uses for the membranes include incorporation into fuel cells and redox flow batteries (RFB) as ion-conducting membranes. 1. A nanoporous selective sol-gel ceramic membrane , comprising:a porous support having a plurality of support pores that are 10 nm or greater in diameter; anda nanoporous composite comprising a nanoporous sol-gel ceramic composite filling at least a portion of an active area of the porous support;wherein the nanoporous sol-gel ceramic has a fractal nanoporous structure as determined by fitting small-angle scattering spectra of the nanoporous sol-gel ceramic to a mathematical model.2. The nanoporous selective sol-gel ceramic membrane of claim 1 , wherein the mathematical model is a fractal aggregate model.3. The nanoporous selective sol-gel ceramic membrane of claim 2 , wherein a least squares regression fit of a de-smeared claim 2 , 1-dimensional small-angle scattering spectra to the fractal aggregate model provides a χ/Nvalue of less than 10 claim 2 ,wherein{'sup': '2', 'χis a sum of an intensity difference between the fractal aggregate model and small-angle scattering spectra data, and'}{'sub': 'pt', 'Nis a number of small-angle scattering data points over a model fitting range.'}4. The nanoporous selective sol-gel ceramic membrane of claim 2 , wherein the fractal aggregate model is a measure of scattering intensity claim 2 , I claim 2 , as a function of a scattering vector claim 2 , q claim 2 , according to the equation:{'br': None, 'i': I', 'q', 'P', 'q', 'S', 'q, '()=()()+bck'}whereinP(q) is a form factor of building blocks of the fractal aggregate model,S(q) is an effective structure factor of the fractal aggregate model, andbck is background scattering.6. The nanoporous ...

Process for Sintering Silicon Carbide

A process for sintering silicon carbide is provided which includes the steps of providing a silicon carbide powder of silicon carbide granules; purifying the silicon carbide powder; subjecting the purified silicon carbide powder to a gel-casting process; removing the gel-cast part from the mold; drying the gel-cast part; obtaining a dried cast ceramic part (a green body) which is capable of green machining into a final desired shape; firing the green body in an oven at temperatures ranging from about 100° C. to about 1900° C. to remove or burn out any polymer remaining in the ceramic; and sintering the green body at temperatures ranging from about 1600° C. to less than about 2200° C. 1. A process for sintering silicon carbide comprising:a.) providing a silicon carbide powder of silicon carbide granules; b. 1.) washing the silicon carbide powder with a solution of hydrofluoric acid,', 'b. 2.) rinsing the silicon carbide powder in distilled water; and', 'b. 3.) drying the silicon carbide powder to obtain a pure silicon carbide powder, wherein granules which form the silicon carbide powder are substantially free of a silicon dioxide shell; and, 'b.) purifying the silicon carbide powder by'} c.1.) mixing the silicon carbide powder with water or a non-aqueous solvent, a dispersant, and gel-forming organic monomers to obtain a ceramic slurry;', 'c.2.) exposing the ceramic slurry to a partial vacuum to remove air from the ceramic slurry;', 'c.3.) adding a polymerization initiator to the ceramic slurry to commence a gel-forming chemical reaction;', 'c.4.) pouring the ceramic slurry into a mold and casting the ceramic slurry into a desired workpiece shape; and', 'c.5.) heating the mold in a curing oven or setting the mold with a catalyst;, 'c.) subjecting the purified silicon carbide powder to a gel-casting process comprising the following stepsd.) removing a gel-cast part from the mold;e.) drying the gel-cast part to remove the water or the non-aqueous solvent and obtain a ...

Wavelength converter, light-emitting device using same, and production method for wavelength converter

A wavelength converter is provided with a light-transmitting substrate and with a thin film that is formed on a surface of the light-transmitting substrate and that contains a phosphor. A sintered body that constitutes the light-transmitting substrate has an average particle size of 5-40 μm. The light-transmitting substrate contains at least 10-500 ppm by mass of MgO. The principal component of the phosphor is an α-sialon that is indicated by the general formula (Ca α ,Eu β ) (Si,Al) 12 (O,N) 16 (provided that 1.5<α+β<2.2, 0<β<0.2, and O/N≦0.04).

PRECURSOR SOLUTION AND METHOD FOR THE PREPARATION OF A LEAD-FREE PIEZOELECTRIC MATERIAL

The present disclosure relates to a precursor solution for the preparation of a ceramic of the BZT-αBXT type, where X is selected from Ca, Sn, Mn, and Nb, and α is a molar fraction selected in the range between 0.10 and 0.90, said solution comprising: 1) at least one barium precursor compound; 2) a precursor compound selected from the group consisting of at least one calcium compound, at least one tin compound, at least one manganese compound, and at least one niobium compound; 3) at least one anhydrous precursor compound of zirconium; 4) at least one anhydrous precursor compound of titanium; 5) a solvent selected from the group consisting of a polyol and mixtures of a polyol and a secondary solvent selected from the group consisting of alcohols, carboxylic acids, ketones, and mixtures thereof; and 6) a chelating agent, as well as method of using the same.

MESOPOROUS MATERIALS FROM NANOPARTICLE ENHANCED POLYSACCHARIDES

There is described a mesoporous composite material comprising carbon nanoparticles dispersed in a mesoporous carbonaceous material. 1. A mesoporous composite material comprising carbon nanoparticles dispersed in a mesoporous carbonaceous material.2. A mesoporous composite material according to wherein the carbon nanoparticles are substantially homogenously dispersed in the mesoporous carbonaceous material.3. A mesoporous composite material according to or wherein the carbon nanoparticles are based on one or more of graphene claim 1 , graphene oxide claim 1 , graphite and carbon nanotubes.4. A mesoporous composite material according to wherein the carbon nanoparticles are based on graphene or graphene oxide.5. A mesoporous composite material according to any one of the preceding claims wherein the carbon nanoparticles are based on graphite.6. A mesoporous composite material according to any one of to wherein the carbon nanoparticles are based on carbon nanotubes.7. A mesoporous composite material according to any one of the preceding claims wherein the mesoporous carbonaceous material is derived from one or more mesoporous polysaccharides.8. A mesoporous composite material according to wherein the mesoporous carbonaceous material is produced by the carbonisation of one or more mesoporous polysaccharides.9. A mesoporous composite material according to any one of the preceding claims wherein the mesoporous composite material precursor is in the form of a stable organic gel before the carbonisation step.10. A mesoporous composite material according to any one of the preceding claims wherein the C:O ratio is tuneable.11. A mesoporous composite material according to any one of the preceding claims wherein the composite material is shaped in different forms.12. A mesoporous composite material according to wherein the composite material is a monolith with a tuneable micro-/mesopore structure throughout.13. A mesoporous composite material according to any one of the ...

Process For Preparing A Sol-Gel From At Least Three Metal Salts And Use Of The Process For Preparing A Ceramic Membrane

Method for preparing a sol-gel corresponding to the general formula (I): A (1-x) A′ x B (1-y-u) B′ y B″ u O 3-δ ,  (I), said method comprising the following steps: a) Preparing an aqueous solution of water-soluble salts of said elements A, A′, optionally A″, B, and B′, in stoichiometric proportions needed to obtain the material as defined above; b) preparing a hydro-alcoholic solution of at least one non-ionic surfactant in an alcohol, mixed with an aqueous solution of ammonia in a proportion sufficient to ensure the complete dissolution of said non-ionic surfactant in said hydroalcoholic solution, the concentration of said non-ionic surfactant in said hydro-alcoholic solution being less than the critical micelle concentration; c) mixing said aqueous solution prepared in step a), with said alcoholic dispersion prepared in step b) to form a sol; d) drying said sol obtained in step c), by evaporating the solvent, to obtain a sol-gel.