ЭКСТРУДИРУЕМАЯ КЕРАМИЧЕСКАЯ КОМПОЗИЦИЯ И СПОСОБ ПОЛУЧЕНИЯ

Изобретение относится к получению керамических сотовых структур для извлечения диоксида углерода или других газообразных химических соединений из газовых потоков или в качестве каталитических преобразователей. Экструдируемый керамический композиционный материал содержит предварительно спеченный порошкообразный материал керамической матрицы, множество частиц, имеющих аспектное отношение от примерно 1 до примерно 100, связующее вещество или экструзионную добавку и жидкость-носитель. Матрица содержит по меньшей мере один порошкообразный цеолит и второй порошкообразный материал из группы, включающей титанаты, оксиды алюминия, оксиды кремния, оксиды циркония, алюмосиликаты, кордиерит и любую их смесь. Указанное множество частиц представляет собой структурно армирующие частицы и/или частицы, модифицирующие теплопроводность. Экструдируемый керамический материал подвергают экструзии и термообрабатывают при температуре от 300 до 700°С. Технический результат изобретения – получение изделий с повышенной ...

Композиционный керамический материал для режущих инструментов

Изобретение относится к композиционным керамическим материалам, которые могут быть использованы для изготовления режущего инструмента и машиностроительных изделий. Керамический композиционный материал для режущих инструментов, включающий в себя глинозем (α-Al2O3) и карбид титана (TiC), дополнительно содержит диборид титана (TiB2) при следующем соотношении компонентов, мас.%: глинозем (α-Al2O3) 30-33; карбид титана (TiC) 27-30; диборид титана (TiB2) 40-41. Технический результат - улучшение физико-механических характеристик композиционного керамического материала, а именно увеличение прочности при изгибе, трещиностойкости и твердости. 1 табл., 3 пр.

СПОСОБ ПОЛУЧЕНИЯ КОМПОЗИЦИОННОГО МАТЕРИАЛА AlO-Al

Изобретение относится к технологии композиционных материалов - керметов и может быть использовано для получения прочных износостойких изделий, работающих в трибосопряжениях в условиях самосмазывания. Для изготовления композиционного материала AlO-Al получали гранулированную шихту, состоящую из смеси алюминиевого порошка (ПАП-2) со стеаратом натрия и глицерином, после высушивания ее термообрабатывали на воздухе (150-350°C, 0,5-1,0 ч) и прессовали под давлением 300-700 МПа, осуществляя выдержку под давлением в течение 15-60 с. Для спекания заготовки инициировали процесс самораспространяющегося высокотемпературного синтеза путем ее нагрева воздушным теплоносителем до 500-600°C с последующей изотермической выдержкой в течение 0,5-1 ч. Фазовый состав спеченного материала был следующим (об.%): Al 78-82, γ-AlO10-14, α-NaSiO3,0-4,0, Si 1,2-2,0, C 2,5-2,8. Плотность материала составила 2,0-2,2 г/см, предел прочности при изгибе 70-160 МПа, коэффициент трения скольжения (по схеме «стержень-диск», ...

КОМПОЗИЦИОННЫЙ МАТЕРИАЛ НА ОСНОВЕ ГЛИНИСТЫХ МАСС И МЕТАЛЛИЧЕСКОГО НАПОЛНИТЕЛЯ

Изобретение относится к получению композиционных материалов. Может использоваться в машиностроении, химии, энергетике, аэрокосмической и автомобильной промышленности для изготовления изделий, испытывающих ударные, динамические и сжимающие нагрузки с одновременным воздействием агрессивных сред и температуры. Металлокомпозиционный материал, содержащий, мас.%: глинистая составляющая - 69,5-94,5; алюминиевый наполнитель - 5,0-30,0; хлорид алюминия - 0,3-0,4; поверхностно-активное вещество - 0,1-0,2. Техническим результатом является повышение прочностных характеристик при уменьшении объемной массы. 3 табл.

АЛЮМОИТТРИЕВЫЕ ЧАСТИЦЫ И СПОСОБЫ ИХ ПОЛУЧЕНИЯ

... 1. Сплавной поликристаллический материал, содержащий Al2О3 и Y2О3, в котором, по меньшей мере, часть Al2О3 является переходным Al2О3, и в котором, по меньшей мере, часть Al2О3 и Y2О3 присутствует в виде комплекса Al2О3 и Y2О3. 2. Сплавной поликристаллический материал по п.1, отличающийся тем, что комплекс Al2О3 и Y2О3 представлен, по меньшей мере, одной из следующих кристаллических структур: гаметическая структура кристалла, кристаллическая структура перовскита или микроструктура, содержащая дендритные кристаллы. 3. Сплавной поликристаллический материал по п.1 или 2, отличающийся тем, что дендритные кристаллы имеют средний размер менее чем 2 микрометра. 4. Сплавной поликристаллический материал по п.1 или 2, отличающийся тем, что содержит, по меньшей мере, 50 массовых процентов Al2О3. 5. Сплавной поликристаллический материал по п.1, отличающийся тем, что материал находится в форме частиц, содержащих Al2О3 и Y2О3, в котором, по меньшей мере, часть Al2О3 является переходным Al2О3, и в котором ...

КЕРАМИЧЕСКИЙ КОМПОЗИЦИОННЫЙ МАТЕРИАЛ НА ОСНОВЕ АЛЮМОКИСЛОРОДНОЙ КЕРАМИКИ, СТРУКТУРИРОВАННОЙ НАНОСТРУКТУРАМИ TiN

Керамический композиционный материал на основе алюмокислородной керамики, структурированной наноструктурами TiN, включающий алюмокислородную матрицу и дисперсную фазу, отличающийся тем, что материал содержит, мас.%: AlO- 84,1% и TiN - 15,9% с диаметром нанонитей TiN 40-70 нм.

Минерало-керамический сплав из глинозема

STOCK FOR PRODUCING REFRACTORY COMPOSITE

Шихта для изготовления огнеупорного композиционного материала

Изобретение относится к керамической промышленности, преимущественно к огнеупорным массам для высокотемпературной изоляции тепловых агрегатов, применяемых при изготовлении фурм судовых паровых котлов. Шихта для изготовления огнеупорного композиционного материала содержит электрокорунд разной фракции, алюмохромофосфатное связующее (АХФС) - алюмохромосиликат - отходьг производства синтетического каучука при следующем соотношении компонентов, мас.%: электрокорунд фракции 800 - 3000 мкм 30 - 35, указанные отходы 25 - 40 тонкодисперсный оксид алюминия 14 - 32, алюмохромфосфат- ное связующее 9 - 12. Использование изобретения позволяет повысить надежность и долговечность работы судовых котлов путем повышения термостойкости, вибростойкости , прочности, огнеупорности материала фурм. 1 табл.

Огнеупорный материал

Огнеупорный материал

SCHLEIFKÖRNER AUF DER BASIS VON ALUMINIUM- UND ZIRKONIUMOXYNITRID

Werkzeug in Form eines heizbaren Stiftes

METHOD OF MAKING COMPOSITE SINTERED ARTIFACT

PROCEDURE FOR THE PRODUCTION OF A WEARING PART AND WEARING PART

GESINTERTES ALUMINIUMOXID-SCHLEIFKORN UND GESINTERTES ALUMINIUMOXID-SCHLEIFKORN UND SCHLEIFENDE ERZEUGNISSE SCHLEIFENDE ERZEUGNISSE

PROCEDURE AND SCHLICKER FOR THE PRODUCTION OF A MOLDED ARTICLE FROM CERAMIC MATERIAL, CERAMIC MOLDED ARTICLE AND USE OF SUCH A MOLDED ARTICLE

PROCEDURE FOR THE PRODUCTION OF AN FERROUSELECTRICAL COMPOSITE MATERIAL

GESINTERTES ALUMINIUMOXID-SCHLEIFKORN UND SCHLEIFENDE ERZEUGNISSE

MELTED SHARPENING PARTICLES, AND PROCEDURES FOR THE PRODUCTION AND USE THE SAME.

PROCEDURE FOR THE PRODUCTION OF EUTECTIC CERAMIC(S)

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.

PROCEDURE FOR THE PRODUCTION OF AN ABSTENTION OF CERAMIC(S) MATERIAL A CONCAVITY.

FIREPROOF KOMPOSITMATERIAL.

MICROWAVE SINTER PROCEDURE

MELTED EUTECTIC MATERIALS OUT ALUMINIUMOXICARBID/NITRIDE ALUMINIUMSELTENERDOX D, SHARPENING PARTICLE, SHARPENING ARTICLES AND PROCEDURES FOR THE PRODUCTION AND USE THE SAME

TOOL EMPLOYMENT AND ASSOCIATED MANUFACTURING PROCESS

MIXTURE CERAMIC(S) ON ALUMINA BASIS

WITH KAUTSCHUKKRÜMELN STRENGTHENED CEMENT CONCRETE

BIOACTIVE BONDING MATERIALS AND METHODS TO YOUR PRODUCTION

Al2o3-la2o3-y2o3-mgo ceramics, and methods of making the same

IN SITU PRODUCTION OF SILICON CARBIDE REINFORCED CERAMIC COMPOSITES

REFRACTORY MATERIAL FOR CASTING A RARE-EARTH ALLOY AND ITS PRODUCTION METHOD AS WELL AS METHOD FOR CASTING THE RARE-EARTH ALLOYS

In casting a rare earth alloy into a sheet (6) using a tundish (3, 13), as a refractory for a tundish which can be used for dispensing with a preheating step for the purpose of improving the flow of a melt (2), use is made of a refractory which consists substantially of 70 wt.% or more of Al2O3 and 30 % or less of SiO2 or consists substantially of 70 wt.% or more of ZrO2 and 30 % or less of one or more of Y2O3, Ce2O3, CaO, MgO, Al2O3, TiO2 and SiO2, and has a bulk density of 1 g/cm3, a thermal conductivity in a temperature range of 1200 to 1400 ~C of 0.5 kcal/(mh ~C) or less, and a heat loss under a heating condition of one hour at 1400 ~C of 0.5 wt.% or less.

METHOD FOR THE PRODUCTION OF HYBRID SPHERICAL MOLDED BODIES FROM SOLUBLE POLYMERS

The invention relates to a method for producing hybrid spherical molded bodies from soluble polymers and at least one embedded additive. According to the inventive method, an additive-loaded polymer solution is dispersed in an inert solvent, said dispersion process being carried out at a reduced pressure. The resulting particle dispersion is cooled to a temperature lying below the solidification point of the polymer solution. The stabilized particles of the polymer solution are separated from the inert solvent. The separated particles of the polymer solution are precipitated in a solvent coagulating the polymer. The solvent-moistened polymer particles are dried until said particles are maximally condensed, and the resulting particles that are made of polymer and the additive are sintered by means of a thermal treatment so as to be turned into porous and/or highly condensed molded bodies. The inventive method makes it possible to obtain highly stable molded bodies which do not sinter together ...

SINTERED CERMETS FOR TOOL AND WEAR APPLICATIONS

A composition of material comprising aluminum oxide and refractory transition metal diborides, with additions of magnesium oxide and, optionally, transition metal carbides, nitrides, carbonitrides and iron group metals for sintering and grain morphology control, is disclosed, which is particularly useful as a cutting tool for steels, cast iron, and hard to machine materials, such as superalloys. In contrast to the TiC-Al2O3 cermets of the prior art which have to be hot pressed for optimum properties, a large portion of the cermets of the invention can also be fabricated, without detriment to performance, by sintering the cold pressed powder compacts in an inert furnace atmosphere at temperatures between 1650.degree.C and l820.degree.C.

COMPOSITE MATERIALS AND METHOD OF ITS MANUFACTURE

A novel solution route has been developed that after heat-treatment to 500- 600~C under inert atmosphere, yields highly porous composites of nano-sized metal (Ni) particle inclusions in ceramics (Al2O3). Metal loadings could be made from < 1% to >95% Ni. The metal inclusion sizes in the Ni-Al2O3 system with the 10 atom% Ni sample were 4-7 nm, while for the 75 atom% Ni sample they were 5-8 nm. It was shown that the 10 atom% Ni sample could be used as a catalyst for the conversion of CO2 and CH4 in the temperature range 550-700~C, while higher temperatures led to growth of the Ni particles and carbon poisoning over time. The solution routes could also be deposited as thin dense films containing <10 nm Ni particles. Such films with high Ni-particle loadings deposited on aluminium substrates have shown very good solar heat absorber proficiency and provide good substrates for carbon tube growth.

HIGH RELIABILITY CERAMIC MULTILAYER LAMINATES, MANUFACTURING PROCESS AND DESIGN THEREOF

The present invention concerns ceramic multilayered laminates, the relative design and manufacturing process, wherein the ceramic multilayered laminates according to the present invention presents a pre-determined mechanical strength characterised by a limited coefficient of variability. By a proper choice of the single layer material and of the stacking order, it is possible to tailor the residual stress profile within the laminate and to obtain "T-curve" fracture behaviour of the laminate.

ALUMINIUM AND ZIRCONIUM OXYNITRIDE ABRASIVE GRAINS

L'invention a pour objet des grains abrasifs à base de corindon-zircone contenant en poids plus de 50% de mélange eutectique alumine-zircone, caractérisés en ce qu'ils contiennent de 0,3 à 3% d'azote, et que les cristaux de zircone sont à plus de 75% sous forme cubique. Ces grains abrasifs sont utilisés notamment pour la fabrication de meules de rectification, de toiles et papiers abrasifs, de pâte à polir et d'abrasifs projetés.

CERAMIC COMPOSITION FOR WEAR RESISTANT APPLICATIONS

A composition for hard, sintered, tough and wear resistant ceramic articles is described. The composition is comprised of alumina, titanium carbonitride and filaments of titanium diboride or titanium nitride. The ceramic articles made of this composition are isostatically hot pressed or sintered at high temperature in inert gas. The density of the ceramic articles is usually in excess of 99% theoretical density and the hardness is greater than 20 GPa. The process was applied to manufacture ceramic cutting inserts of the above composition.

CERAMIC COMPOSITION FOR WEAR RESISTANT APPLICATIONS

A composition for hard, sintered, tough and wear resistant ceramic articles is described. The composition is comprised of alumina, titanium carbonitride and filaments of titanium diboride or titanium nitride. The ceramic articles made of this composition are isostatically hot pressed or sintered at high temperature in inert gas. The density of the ceramic articles is usually in excess of 99% theoretical density and the hardness is greater than 20 GPa. The process was applied to manufacture ceramic cutting inserts of the above composition.

THE BONDING OF BODIES OF REFRACTORY HARD MATERIALS TO CARBONACEOUS SUPPORTS

Bodies (3) such as tiles, plates, slabs or bricks of Refractory Hard Material (RHM) or other refractory composites are bonded to the cathodes or to other components, in particular to a carbon cell bottom (1), of a cell for the production of aluminium by electrolysis of a cryolite-based molten electrolyte, made of carbonaceous or other electrically conductive refractory material, by a non-reactive colloidal slurry (4) comprising particulate performed RHM in a colloidal carrier selected from colloidal alumina, colloidal yttria and colloidal ceria. The slurry usually comprises preformed particulate TiB2 in colloidal alumina. The bodies (3) are usually TiB2-Al2O3 composites. The bonding is achieved simply by applying the slurry and allowing it to dry.

Self-lubricating material for micro-mechanical part, e.g. micro-bearing - comprising porous ceramic partly filled with solid, pref. lubricant, impregnated with liq. lubricant to reduce contact pressure and wear

Self-lubricating material (I) comprises a porous ceramic (II); a first solid (III), which is porous and is dispersed and partly fills the pores of (II); and a second liq. lubricant (IV), which is absorbed in the pores of (III) and (II) without filling (III). (III) is pref. a solid lubricant; and (IV) a perfluoropolyethylene oxide polyether (IVA), Pref. (II)/(III) combinations are Al2O3/graphite, Al2O3/BN and ZrO2/graphite. USE/ADVANTAGE - (I) is used for making micro-mechanical pts. (claimed), esp. sliding pts. of bearings, such as micro-bearing with a dia. of ca. 0.16 mm. Part of the lubricant extends to the surface of (I), reducing the local contact pressure and abrasive wear. (III) ensures that (II) has good bearing properties and facilitates absorption of (IV). If (III) consists of solid lubricant, any detached particles are lubricating.

Self-lubricating material for micro-mechanical part, e.g. micro-bearing - comprising porous ceramic partly filled with solid, pref. lubricant, impregnated with liq. lubricant to reduce contact pressure and wear

Self-lubricating material (I) comprises a porous ceramic (II) a first solid (III), which is porous and is dispersed and partly fills the pores of (II) and a second liq. lubricant (IV), which is absorbed in the pores of (III) and (II) without filling (III). (III) is pref. a solid lubricant and (IV) a perfluoropolyethylene oxide polyether (IVA), Pref. (II)/(III) combinations are Al2O3/graphite, Al2O3/BN and ZrO2/graphite. USE/ADVANTAGE - (I) is used for making micro-mechanical pts. (claimed), esp. sliding pts. of bearings, such as micro-bearing with a dia. of ca. 0.16 mm. Part of the lubricant extends to the surface of (I), reducing the local contact pressure and abrasive wear. (III) ensures that (II) has good bearing properties and facilitates absorption of (IV). If (III) consists of solid lubricant, any detached particles are lubricating.

Self-lubricating material and method for manufacturing micromechanical parts made of this material.

БЕСЦЕМЕНТНАЯ ОГНЕУПОРНАЯ СМЕСЬ ДЛЯ ИЗГОТОВЛЕНИЯ ОГНЕУПОРНОГО ИЗДЕЛИЯ, ОГНЕУПОРНОЕ ИЗДЕЛИЕ И СПОСОБ ЕГО ПОЛУЧЕНИЯ

Изобретение обеспечивает бесцементную огнеупорную смесь. Смесь включает рН-буфер и компонент, который включает метал лили тонодисперсный кремнезем. Вода может придавать смеси надлежащие характеристики текучести и может обеспечивать эффективное затвердевание при низкой температуре. При повышенных температурах изделие, сформованное с применением данной смеси, имеет превосходную огнеупорность и физические свойства.

Высокотемпературный абразив со связкой (варианты) и способ его формирования

Высокотемпературный абразив со связкой содержит абразивные зерна оксида алюминия и стекловидную связывающую матрицу, в которой распределены абразивные зерна оксида алюминия, причем стекловидная связующая матрица имеет температуру отверждения не менее 1000 °С. Абразивные зерна оксида алюминия содержат поликристаллический альфа-оксид алюминия, имеющий тонкую кристаллическую микроструктуру, которая характеризуется средним размером доменов альфа-оксида алюминия не более 500 нм, и абразивные зерна оксида алюминия, кроме того, содержат агент, создающий центры пиннинга, который является фазой, диспергированной в поликристаллическом альфа-оксиде алюминия.

High-rigidity high-power sheet aluminum oxide porous ceramic used for LED lamp heat dissipation and preparation method thereof

A ceramic matrix composite component and a method of attaching a static seal to a ceramic matrix composite component

A ceramic matrix composite (CMC) component and a method of attaching a static seal to a ceramic matrix composite component are provided. The CMC component includes a first end and a second end. A CMC metal interface member is attached to the second end. The CMC metal interface member is operable to join to a static seal in a gas turbine.

Wave-absorbing ceramic-based composite material with three-dimensional prism periodic structure and preparation method thereof

The invention discloses a three-dimensional prism periodic structure wave-absorbing ceramic matrix composite material and a preparation method thereof. The ceramic matrix composite material comprises a dielectric layer, a wave-absorbing unit formed on the dielectric layer in situ, and a ceramic matrix filled in a gap between the dielectric layer and the wave-absorbing unit, wherein the wave absorbing unit is formed by stacking conductive fibers and is in a three-dimensional prism shape. A discrete periodic wave-absorbing unit with a three-dimensional prism periodic structure is formed in situ on ceramic fiber cloth (namely a dielectric layer) with a certain thickness, and a gap between the dielectric layer and the wave-absorbing unit is filled with a ceramic matrix, so that the wave-absorbing ceramic matrix composite with the three-dimensional prism periodic structure and the porosity of less than 10% is finally obtained. According to the ceramic-based composite material, the ultra-wideband ...

FUSED GRAINS - SPINEL AND ZIRCONIA REFRACTORY PRODUCT OBTAINED FROM SAID GRAINS

Grains fondus dans lesquels : - lesdits grains comprennent une matrice de l'eutectique zircone-spinelle enrobant des inclusions constituées essentiellement d'une phase zircone ou d'une phase spinelle, - lesdits grains présentent la composition chimique globale suivante, en pourcentages poids exprimés sous la forme d'oxydes : ○ plus de 45, 0% et moins de 95, 0% de ZrO2, ○ plus de 3,0% et moins de 40,0% d'Al2O3, ○ plus de 1,0% et moins de 20,0% de MgO, ZrO2, Al2O3 et MgO représentent ensemble au moins 95,0% du poids desdits grains.

METHOD FOR PRODUCING A CERAMIC MATERIAL OF RED COLOR

La présente invention vise un procédé de fabrication d'un produit en matériau céramique caractérisé en ce qu'il comporte les étapes suivantes de : a/- mélange d'une poudre céramique avec une poudre de pigment Sulfure de Cérium de sorte à obtenir un mélange de poudres homogène ; b/- frittage flash du mélange de poudres homogène pour densifier ledit mélange, ledit frittage étant réalisé à une température dite de frittage prédéterminée, ledit procédé comportant une étape intermédiaire b1/ de chauffage dudit mélange de poudres homogène suivant un profil de température comprenant : ○ une première phase de montée en température à une première vitesse A pendant une première durée t1, ○ et une deuxième phase de montée en température à une deuxième vitesse B inférieure à la première vitesse A pendant une deuxième durée t2, jusqu'à atteindre la température de frittage qui est alors maintenue pendant une durée t3.

PROCEDE POUR LA PREPARATION D'UNE POUDRE DE CARBURE DE TITANE A GRAINS FINS

PROCEDE POUR LA PREPARATION D'UNE POUDRE DE CARBURE DE TITANE FINEMENT DIVISEE DANS LEQUEL ON FAIT REAGIR UN ORGANOTITANATE AVEC UN POLYMERE PRECURSEUR DU CARBONE AFIN D'OBTENIR UN MELANGE DE TITANE ET DU POLYMERE A UN NIVEAU MOLECULAIRE GRACE A LA REACTION DE RETICULATION ENTRE L'ORGANOTITANATE ET LE POLYMERE. ON SECHE LE GEL OBTENU, ON LE PYROLYSE POUR EN EXTRAIRE LES CONSTITUANTS VOLATILS ET FOURNIR DU CARBONE. ON CHAUFFE ENSUITE LES SOLIDES OBTENUS A UNE TEMPERATURE ELEVEE POUR CONVERTIR LE TITANE ET LE CARBONE EN POUDRE DE CARBURE DE TITANE DE HAUTE PURETE DONT LA GRANULOMETRIE EST DANS UNE PLAGE SUBMICRONIQUE.

ADDITION Of AGENT (S) BLOCKING (S) IN a CERAMIC MEMBRANE TO BLOCK CRYSTALLINE LACROISSANCE OF the GRAINS DURING SINTERING UNDER ATMOSPHERE

PROCEEDED FOR the PREPARATION Of a TITANIUM CARBIDE POWDER HAS FINE GRAINS

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.

ZrB2-SiC Composition and manufacturing method of the same

용융 금속 수용 용기 및 그 제조 방법

... 본 발명의 실시예들이, 내부에 용융 금속을 수용하거나 이송하기 위한 용기를 제공한다. 용기의 외측 표면의 적어도 일부분은 표면 내에 매립되는 금속 와이어들의 망을 일체화하며, 와이어들은 그들 사이에 형성되는 개구부들을 갖도록 서로 붙는다. 내화재는 개구부들 속으로 관통한다. 망은 직조 금속 와이어들 또는 비-직조 와이어들, 또는 둘 모두를 포함할 것이다. 망은 균열 발생(또는 일단 형성된 균열의 수용)에 대한 저항성 및/또는 균열이 발달하는 경우의 용융 금속 누출에 대한 저항성을 부여한다. 본 발명은 또한 그러한 용기를 포함하는 금속 수용 구조체 및 이를 제조하는 방법을 제공한다.

ABRASIVE PARTICLES, ABRASIVE ARTICLES, AND METHODS OF MAKING AND USING THE SAME

PREPARATION OF FUNCTIONAL CERAMIC POWDER USING TOURMALINE AND PRECIOUS METAL CATALYST

PURPOSE: Provided is a preparation method of functional ceramic powder with deodorization, water evaporation, far infrared emission, and anion generation by mixing precious metal catalyst using alumina and charcoal as a carrier with tourmaline. CONSTITUTION: The preparation method of functional ceramic powder is as follows: preparing a carrier by mixing gamma-alumina with white coal in a weight ratio of 3:1 and drying at 110deg.C for 2hrs.; preparing a catalyst solution(pH3), 1wt.% Pt solution, by dissolving H2PtCl6·6H2O into water, and adding 3wt.%(based on the amount of alumina) of citric acid, and HNO3 and 2-aminoethanol for pH control; soaking the carrier into Pt solution for 20min to be 0.5wt.% Pt/gamma-Al2O3, and stirring at 70deg.C for 2hrs to get Pt into halls between alumina and charcoal; vacuum drying at 50deg.C for 2hrs.; oxidizing at 400deg.C for 4hrs in air atmosphere to activate the dried catalyst; reducing the catalyst and carrier by supplying a mixed gas composed of N2 and ...

ABRASIVE GRAINS To the BASE OF OXINITRETO OF ALUMINUM

COLOURED SINTERED PART

Particulate mixture having the following chemical composition, in percentages by weight on the basis of the oxides: - ZrO2 ≥ 10.0%; - 2% < Al2O3 ≤ 80%; - 2 to 20.0% of an oxide chosen from Y2O3, Sc2O3, MgO, CaO, CeO2, and mixtures thereof, the MgO + CaO content being less than 5.0%; - 0 to 18.0% of an oxide chosen from ZnO, lanthanide oxides except for CeO2, and mixtures thereof; - less than 12.0% of other oxides; said particulate mixture comprising a pigment, in an amount between 0.5 and 0.0%, made of a material chosen from - oxide(s) of perovskite structure, - oxides of spinel structure, - oxides of hematite structure E2O3, the element E being chosen from the group GE (1) formed by the mixtures of aluminium and chromium, the mixtures of aluminium and manganese, and mixtures thereof, - the oxides of rutile structure FO2, the element F being chosen from the group GF (1) formed by the mixtures of tin and vanadium, the mixtures of titanium and chromium and niobium, the mixtures of titanium ...

METHOD FOR PRODUCING A CIRCUIT CARRIER

The invention relates to a method for producing a circuit carrier (43, 5) in which a carrier substrate (33, 35, 45) is provided, a structure (37, 47) for a conductor (40, 52) to be applied is introduced into the surface (31, 39, 39) of the carrier substrate (33, 35, 45) by means of a laser, wherein the structure (37, 47), while forming the circuit carrier (43, 54), is provided with a metal coating (41, 53) forming the conductor (40, 52). A ceramic material (12, 16) is used as the carrier substrate (33, 35, 45). The invention further relates to a carrier substrate (33, 35, 45) for a ceramic material (12, 16), to a use of a ceramic material (12, 16) as the carrier substrate (33, 35, 45), and to the ceramic material (12, 16) per se.

CERAMIC-METAL OR METAL-CERAMIC COMPOSITE

A ceramic-metal or metal-ceramic composite or composite material comprising a ceramic matrix with an embedded metal component or consisting of ceramic particles or structures which are embedded in a metal matrix, produced by means of pressure-less infiltration. The ceramic material is at least partially provided in the form of an oxidic ceramic material. Metallic titanium and/or chrome and/or compounds thereof are incorporated as an activator.

OPTICAL-COMPONENT RETAINING MEMBER

This optical-component retaining member is formed from an aluminum oxide-based ceramic containing an oxide of titanium represented by the composition formula TiO2-x(1 ≤ x <2). The total content of Fe, Ni, Co, Mn, and Cr is 260 mass ppm or less.

METHOD FOR PREPARING STRUCTURAL CERAMIC NANOCOMPOSITES OF ALUMINA AND SILICON CARBIDE, AND NANOCOMPOSITES PREPARED BY THE METHOD

L'invention concerne des nanocomposites de céramique d'alumine/carbure de silicium structurels, possédant une résistance à l'usure par érosion élevée, préparés au moyen d'un procédé qui, outre les étapes conventionnelles de mélange d'alumine et de carbure de silicium, de séchage dudit mélange et de consolidation de ce mélange par frittage sans pression, éventuellement précédé d'une compression isostatique à froid afin de fabriquer une briquette, est caractérisé par l'incorporation, au niveau de l'étape de mélange, d'un dopant de frittage sélectionné dans le groupe constitué par les oxydes d'yttrium, de magnésium, de titane, de calcium, de zinc, de zirconium, de cérium et par les autres lanthanides à l'exception du prométhéum, et par des mélanges desdits oxydes. Ce procédé permet d'abaisser de manière significative la température nécessaire au frittage, pour un temps de pénétration de frittage donné, en-dessous des valeurs conventionnelles. La proportion de dopant est comprise entre 0,1 ...

NANOCRYSTALLINE CERAMIC MATERIALS REINFORCED WITH SINGLE-WALL CARBON NANOTUBES

Composites of ceramic materials, notably alumina or metal oxides in general, with single-wall carbon nanotubes are consolidated by electric field-assisted sintering to achieve a fully dense material that has an unusually high fracture toughness compared to the ceramic alone, and also when compared to composites that contain multi-wall rather than single-wall carbon nanotubes, and when compared to composites that are sintered by methods that do not include exposure to an electric field.

DECORATIVE ARTICLE CONTAINING AN EQUIPPED, COLOURED AND SINTERED ZIRCONIA PART

The invention relates to a decorative article comprising a sintered part having the following chemical composition, in percentages by weight on the basis of the oxides: - ZrO2 ≥ 10.0%; - 2% < Al2O3 ≤ 80%; - 2 to 20.0% of an oxide chosen from Y2O3, Sc2O3, MgO, CaO, CeO2, and mixtures thereof, the MgO + CaO content being less than 5.0%; - 0 to 18.0% of an oxide chosen from ZnO, lanthanide oxides except for CeO2, and mixtures thereof; - less than 12.0% of other oxides; said particulate mixture comprising a pigment, in an amount between 0.5 and 0.0%, made of a material chosen from - oxide(s) of perovskite structure, - oxides of spinel structure, - oxides of hematite structure E2O3, the element E being chosen from the group GE (1) formed by the mixtures of aluminium and chromium, the mixtures of aluminium and manganese, and mixtures thereof, - the oxides of rutile structure FO2, the element F being chosen from the group GF (1) formed by the mixtures of tin and vanadium, the mixtures of titanium ...

HYDROGEN TRANSPORT MEMBRANES

Improvements are disclosed for fabrication of composite hydrogen transport membranes, which are used for extraction of hydrogen from gas mixtures. Methods are described for supporting and re-enforcing layers of metals and metal alloys which have high permeability for hydrogen but which are either too thin to be self supporting, too weak to resist desired differential pressures across the membrane, or which become embrittled by hydrogen. In order to minimize stress at internal interfaces, which can lead to formation of dislocations and initiations of cracks, the support material is chosen so as to be lattice matched to the metals and metal alloys. Preferred metals with high permeability for hydrogen include vanadium, niobium, tantalum, palladium, and alloys thereof. In one embodiment, a porous support matrix is fabricated first, and then the pores are blocked by metals and metal alloys which are permeable to hydrogen. In a second embodiment, powders of the preferred metal are first sintered ...

COMPOSITE MATERIAL AND PROCESS FOR PRODUCING THE SAME

A composite material based on the product of combustion synthesis and/or heat generation, and an effective process for producing the same. The composite material is essentially (1) a refractory/metal composite material which comprises one or more skeletal structures formed by joining three-dimensionally one or more types of refractory particle selected from among carbides, borides, nitrides and silicides of metals selected from among titanium, zirconium, tantalum, niobium, silicon, chromium, tungsten and molybdenum and a metallic phase comprising an alloy or intermetallic compound filled in the gaps within or among the skeletal structures, or (2) a sintered composite material comprising superabrasive grains dispersed in the surface or surface layer part including the part corresponding to the working face of a matrix or the whole of a matrix containing a metallic substance produced by combustion synthesis and/or a refractory. It is effective to use also superabrasive grains coated with ...

DEVICE COMPRISING A MEMBER OF CERAMIC MATERIAL AND A METHOD FOR MANUFACTURING A CERAMIC MATERIAL HAVING A LOW FRICTION COEFFICIENT

La présente invention concerne un assemblage comprenant au moins deux éléments en contact que l'on peut déplacer l'un par rapport à l'autre. Selon l'invention, au moins un des éléments est un élément céramique formé à partir d'un matériau de base en aluminium, zirconium ou silicium, comprenant une inclusion réduisant la température de superplasticité, ou une inclusion qui, après frittage, possède une dureté inférieure ou égale à 7 Mohs. L'oxyde de cuivre, par exemple, constitue une inclusion satisfaisante. De cette façon, on obtient un assemblage qui possède un coefficient de frottement réduit. L'invention concerne, en outre, un procédé de fabrication d'un matériau céramique ainsi qu'une utilisation de l'inclusion définie pour la fabrication de matériau céramique à faible coefficient de frottement.

Ceramic with improved high temperature electrical properties for use as a spark plug insulator

An insulator including alumina in an amount between about 90 and about 99% by weight and an oxide mixture or glass mixture including Boron Oxide, Phosphorus Oxide, or both Boron and Phosphorus Oxide.

Platelet α-Al2 O3 based ceramic composite

A platelet α-Al2 O3 based ceramic composite consists of Al2 O3 powder, promoters and controllers. The composite is prepared by mixing aluminum oxide powder with promoters and controllers. The mixture is shaped and sintered to form an object. In one embodiment of the invention, the promoters are either salts or oxides of alkaline metals and alkaline earth metals. The salts are oxidized during sintering.

Aluminum oxide-containing metal compositions and cutting tool made therefrom

A composition formed from (a.) aluminum oxide and/or a solid solution and/or a multiphase composition of aluminum oxide with one or more other metal oxide(s) and (b.) a metallic alloy and having a microstructure comprising a metallic phase, ceramic phase(s) comprising a reactive metal oxide phase and/or solid solutions containing said oxide, an aluminum oxide phase and/or solid solutions of aluminum oxide with one or more other metal oxides. The metallic alloy contains at least one metal characterized by a ΔG of formation (Gibbs free energy) per mole of oxygen of its oxide that is comparable to or greater than the ΔG of formation (Gibbs free energy) per mole of oxygen of aluminum oxide (133 Kcal/mole oxygen). The grain size of the ceramic phase(s) is less than about 10 microns. Cutting tools formed from these compositions have better operating lives than cutting tools containing tungsten carbide or titanium carbide.

Thermal shock-resistant alumina-mullite composite material and preparation method thereof

A thermal shock-resistant alumina-mullite composite material and a preparation method thereof which are capable of concurrently obtaining the compactness of the material and a mullite formation. The material is comprised of 4∼30 weight % of one aluminum silicate selected from the group consisting of kaolinite, silimanite, and kyanite, 75∼94 weight % of Al2 O3 based on the total amount of Al2 O3, and 0.5∼6 weight % of an alkaline earth metal oxide, wherein the weight ratio of the alkaline earth metal oxide to SiO2 is 1:2∼1:3. The composition is first sintered at a temperature of 1450°∼1650° C. for 1∼5 hours, then cooled down to 1000° C., and then crystallized at a temperature of 1200°∼1500° C. for 1∼20 hours. This composition is usable to a maximum temperature 300° C. as indicated theraml- shock-resistant testing, and is well application to a part subject to wide thermal variation and for which a conventional 85%∼96% alumina material is not usable.

Method for injecting a loaded slurry into a fibrous texture

A method for manufacturing a part made of composite material includes injecting into a fibrous texture a slurry including at least one powder of refractory ceramic particles suspended in a liquid phase, filtering the liquid phase of the slurry and retaining the powder of refractory ceramic particles inside the texture so as to obtain a fibrous preform loaded with refractory ceramic particles, densifying the fibrous texture by treatment of the refractory ceramic particles present in the fibrous texture in order to form a refractory matrix in the texture. The method further includes, before injecting the slurry under pressure, pre-saturating the fibrous texture with a carrier fluid consisting in injecting into said texture a carrier fluid.

Manufacture of complex shaped Cr3C2/Al2O3 components by injection molding technique

The purpose of this invention is to manufacture complex shaped Cr3C2/Al2O3 components efficiently with effective cost. Chromium carbide, which is quite chemically inert at elevated temperature, is added into an alumina matrix for toughening purposes. Chromium carbide and alumina ceramic powders are mixed with binders to form a solidified suspension. The suspension is then crushed, heated, and injected into green products. Controlled solvent and thermal debinding processes are followed before performing pressureless sintering. Samples are sintered in pre-treated argon gas with minimum oxygen partial pressure, or in vacuum for controlling the phase stability and microstructure for tailoring mechanical properties. The processing parameters for injection molding, the composition design of binders and ceramic composites, and the techniques for controlling the phase transformation of chromium carbide are developed. A near-net shape complex component with minimum after machining can be manufactured ...

Ceramic composition and a process for producing the same

A novel ceramic composition having high strength at high temperatures and needing no degreasing step before its sintering step, and a process for producing the same are provided, which composition is obtained by calcining a molded body composed of alumina powder and a polysilazane in an inert gas such as nitrogen, argon, etc. and/or ammonia, or under pressure and at 800 DEG -1950 DEG C. the polysilazane including the following: a polysilazane (i) having a core structure consisting of repetitive units of and comprising the residual groups of the precursor of (i) having and partly forming structural units of the structural units being bonded to each other, a polysilazane (ii) having the above core structure and comprising the residual groups of the precursor of (ii) consisting of repetitive units of being bonded by a structural unit of to each other, and the precursor being composed of units of wherein; and a polysilazane (iii) having the above ...

Substrate materials for magnetic heads with low flying height

Substrate materials for magnetic heads consisting of 24-75 mol % of alpha -Al2O3 and the remaining 76-25 mol % of TiCXOYNZ, or TiCXOYNZ containing a small amount of additives, that has a NaCl-type structure which retain known characteristics required on such materials and have controlled sizes of crystallites of Al2O3 and TiCXOYNZ, uniformly dispersed TiCXOYNZ crystallites and, if any, additive elements, in which internal stress is relieved. The materials are intended for eliminating problems in machining to form steps and thus for fabricating high-precision thin-film heads for high-density recording.

SINTERED MATERIAL, TOOL INCLUDING SINTERED MATERIAL, AND SINTERED MATERIAL PRODUCTION METHOD

To provide a sintered material having excellent oxidation resistance, as well as excellent abrasion resistance and chipping resistance. A sintered material containing a first compound formed of Ti, Al, Si, O, and N is provided.

SINTERED CERAMIC BODIES AND APPLICATIONS THEREOF

In one aspect, sintered ceramic bodies are described herein which, in some embodiments, demonstrate improved resistance to wear and enhanced cutting lifetimes. For example, a sintered ceramic body comprises tungsten carbide (WC) in an amount of 40-95 weight percent, alumina in an amount of 5-30 weight percent and ditungsten carbide (WC) in an amount of at least 1 weight percent. 1. A sintered ceramic body comprising:tungsten carbide (WC) an amount of 40-95 weight percent and AlON.2. The sintered ceramic body of claim 1 , wherein the AlON is present in an amount of 0.1 to 40 weight percent.3. The sintered ceramic body of further comprising ditungsten carbide (WC).4. The sintered ceramic body of claim 3 , wherein the WC is present in an amount of 0.1-25 weight percent.5. The sintered ceramic body of further comprising zirconia in an amount of 0.1-10 weight percent.6. The sintered ceramic body of further comprising alumina claim 1 , aluminum nitride or combinations thereof.7. The sintered ceramic body of further comprising an additive component comprising one or more Group VB metal carbides claim 1 , chromium carbide claim 1 , ZrNbC or mixtures thereof.8. The sintered ceramic body of further comprising one or more titanium (Ti) compounds claim 1 , molybdenum (Mo) compounds claim 1 , or (Ti claim 1 ,Mo)-compounds.9. The sintered ceramic body of claim 8 , wherein the one or more Ti-compounds claim 8 , Mo-compounds claim 8 , or mixtures thereof are present in a total amount of 0.1-20 weight percent.10. The sintered ceramic body of claim 8 , wherein Mo is present in the sintered ceramic body in an amount of 0.05 to 1 weight percent. Pursuant to 35 U.S.C. § 120, the present application is a divisional application of U.S. patent application Ser. No. 15/641,846 filed Jul. 5, 2017 which is a divisional application of U.S. Pat. No. 9,845,268.The present invention relates to sintered ceramic bodies and, in particular, to sintered ceramic bodies having compositions and properties ...

Alumina sintered body and method for producing the same

An alumina sintered body having communicating pores of 400-1100 Å in average pore diameter and 4-16% in porosity and being obtainable by mixing first alumina particles 1 having a particle diameter of 0.2-0.7 mum and a sphericity of 0.7-1.0 as an aggregate and second alumina particles having a particle diameter of 0.01-0.1 mum as a pore forming material to embed a plurality of the second alumina particles 2 in the spaces between the first alumina particles 1 , and sintering the mixture at a temperature of 1200-1400° C. The alumina sintered body can be used for a part for various gas permeable industrial materials inclusive of protective film for gas sensors, and the like.

Сеrаmiс with imprоvеd high tеmpеrаturе еlесtriсаl prоpеrtiеs fоr usе аs а spаrk plug insulаtоr

Аn insulаtоr inсluding аluminа in аn аmоunt bеtwееn аbоut 90 аnd аbоut 99% bу wеight аnd аn охidе miхturе оr glаss miхturе inсluding Воrоn Охidе, Рhоsphоrus Охidе, оr bоth Воrоn аnd Рhоsphоrus Охidе.

Alumina-silica based fiber, ceramic fiber, ceramic fiber aggregation, holding seal material and manufacturing methods thereof, as well as manufacturing method of alumina fiber aggregation

A ceramic fiber having a branched structure.

MELTED GRAINS COATED WITH SILICA

METHOD FOR PRODUCING CERAMIC COMPOSITE FOAMS WITH HIGH MECHANICAL STRENGTH

BINDER FOR MONOLITHIC REFRACTORIES, MONOLITHIC REFRACTORY, AND CONSTRUCTION METHOD FOF MONOLITHIC REFRACTORIES

Method of producing cavity containing ceramic material

A method of producing a self-supporting ceramic composite body having therein at least one cavity which inversely replicates the geometry of a positive mold of parent metal, includes embedding the mold of parent metal within a conformable bed of filler to provide therein a cavity shaped and filled by the mold. The assembly is heated to melt the parent metal mold, e.g., an aluminum parent metal mold, and contacted with an oxidant to oxidize the molten parent metal to form a polycrystalline material which grows through the surroundings of filler, the molten metal being drawn through the growing polycrystalline material to be oxidized at the interface between the oxidant and previously formed oxidation reaction product whereby the cavity formerly filled by the mold of parent metal is eventually evacuated by the metal. There remains behind a cavity whose shape inversely replicates the original shape of the mold. The method provides ceramic composite articles having therein at least one cavity ...

COMPOSITE MATERIAL AND PRODUCTION METHOD THEREFOR

СПОСОБ НАГНЕТАНИЯ СОДЕРЖАЩЕГО НАПОЛНИТЕЛЬ ШЛИКЕРА В ВОЛОКНИСТУЮ СТРУКТУРУ

Изобретение относится к способу изготовления детали из композитного материала. Способ включает следующие этапы: нагнетание внутрь волокнистой структуры шликера, содержащего, по меньшей мере, порошок из огнеупорных керамических частиц или из частиц огнеупорного керамического предшественника в виде взвеси в жидкой фазе; затем фильтрацию жидкой фазы шликера и задержание порошка из огнеупорных керамических частиц или частиц огнеупорного керамического предшественника внутри указанной структуры для получения предварительно отформованной волокнистой заготовки с наполнением из огнеупорных керамических частиц или частиц из огнеупорного керамического предшественника после уплотнения волокнистой структуры путём обработки огнеупорных керамических частиц в волокнистой структуре для формирования огнеупорной матрицы в этой структуре. Согласно изобретению способ содержит проводимый до этапа нагнетания шликера этап предварительного насыщения волокнистой структуры жидким носителем, заключающийся в нагнетании ...

Способ изготовления композитных керамических изделий

Изобретение относится к области машиностроения и может быть использовано при изготовлении композитных керамических изделий типа опорных элементов (например, колец/валов подшипников качения/скольжения) или инструментов типа чашечных резцов или режущих керамических пластин. Способ изготовления композитных керамических изделий включает подготовку исходной шихты, содержащей порошковую матрицу AlO, нитевидные армирующие кристаллы карбида кремния и вязкое связующее, формование экструзией из исходной шихты плоской заготовки с ориентацией в ней нитевидных армирующих кристаллов в направлении экструзии, формирование из заготовки в вязкотекучем состоянии брикета, отгонку из брикета связующего и горячее прессование изделия. Для образования цилиндрического брикета плоскую заготовку в вязкотекучем состоянии наматывают на оправку, в процессе отгонки связующего оси брикета придают вертикальное положение, а горячее прессование изделия осуществляют в направлении оси цилиндрического брикета. Техническим результатом ...

СПОСОБ ПРИГОТОВЛЕНИЯ КЕРМЕТА

Изобретение относится к области химии, а именно к керамометаллам, фильтрующим элементам, носителям для катализаторов и мембран, которые могут быть использованы преимущественно в различных гетерогенных каталитических процессах химической промышленности, а также в энергетике, автомобильной промышленности. Описан способ получения кермета, который осуществляют смешением порошков алюминия с железом или кобальтом с последующим мехактивированием композитного порошка, полученный порошок смешивают с порошком оксида и/или гидроксида алюминия, либо с продуктом термохимической активации гидраргиллита в центробежном флаш-реакторе, либо с продуктами его переработки на основе гидратированных соединений алюминия, засыпают в пресс-форму, подвергают гидротермальной обработке, сушат и прокаливают, при этом полученный кермет содержит сплав алюминия с кобальтом, оксид алюминия и оксиды кобальта или содержит железо, сплав алюминия с железом, оксид алюминия и оксиды железа, при этом прочность кермета находится ...

КЕРАМИЧЕСКИЙ МАТЕРИАЛ НА ОСНОВЕ КОРУНДА И СПОСОБ ЕГО ПОЛУЧЕНИЯ

КОМПОЗИЦИОННЫЙ КЕРАМИЧЕСКИЙ МАТЕРИАЛ И СПОСОБ ЕГО ПОЛУЧЕНИЯ

Изобретение относится к композиционным керамическим материалам конструкционного назначения и способу его получения. Материал может быть использован для изготовления высокопрочных изделий, преимущественно в медицинской области в качестве эндопротезов суставов. Техническим результатом изобретения является разработка композиционного керамического материала с высокой устойчивостью к хрупкому разрушению. Композиционный керамический материал на основе синтезированных нанопорошков содержит корунд, тетрагональный диоксид циркония и гексаалюминат кальция-церия - [CeCa]AlOпри следующем соотношении компонентов, об.%: 63-66 - AlO(корунд), 6-8 - [CeCa]AlO(гексаалюминат кальция-церия), остальное - тетрагональный ZrO(Ce-TZP). Способ его получения включает одновременное обратное осаждение из смеси одномолярных растворов оксихлорида циркония, нитратов церия, алюминия и кальция раствором аммиака в присутствии изобутанола прекурсоров нанопорошков, имеющих химический состав (мол. %) AlO61-65%, ZrO28-34%, CeO ...

СПОСОБ ИЗГОТОВЛЕНИЯ ДЕТАЛИ ИЗ КОМПОЗИЦИОННОГО МАТЕРИАЛА ПОСРЕДСТВОМ НАГНЕТАНИЯ ШЛИКЕРА С НАПОЛНИТЕЛЕМ В ВОЛОКНИСТУЮ СТРУКТУРУ

Способ изготовления биокерамики с использованием соединений кальция

Способ изготовления биокерамики с использованием соединений кальция

Изобретение относится к биосовместимым композитным материалам на основе керамики и может быть использовано при изготовлении имплантов для регенеративной и реконструктивной костной хирургии. Спекаемую смесь готовят на планетарной мельнице, для чего в течение 30 мин со скоростью 600 об/мин смешивают порошок оксида алюминия с порошками оксида кальция и гидрофосфата кальция при соотношении в них Ca/P, равном 1,66, причем порошки оксида алюминия, оксида кальция и гидрофосфата кальция берут в соотношении, обеспечивающем образование биоактивной фазы в количестве 20 масс. % от общей массы образующегося композита. Готовую спекаемую смесь помещают в графитовую пресс-форму и подпрессовывают при давлении 20,7 МПа, далее полученную заготовку помещают в вакуумную камеру и подвергают искровому плазменному спеканию, при котором образец выдерживают при температуре 1000°С в течение 5 мин и охлаждают до температуры 20-25°С. При искровом плазменном спекании скорость нагрева составляет 300°С/мин при температуре ...

Spark plug

A spark plug exhibits a satisfactory withstand voltage characteristic and sufficient mechanical strength in a high temperature environment exceeding 700° C. The spark plug has a center electrode, an insulator, and a ground electrode, characterized in that the insulator is formed of an alumina-based sintered material containing an Si component, a Group 2 element (2A) component, and a rare earth element (RE) component; that the alumina-based sintered material has an RE-β-alumina crystal phase; and that the mean crystal grain size D A (RE) of the RE-β-alumina crystal phase and that of alumina D A (Al) satisfy the following relationship (1): 0.2≦D A (RE)/D A (Al)≦3.0.

Precision pressing and sintering of cutting inserts, particularly indexable cutting inserts

A ready-for-use ceramic produced by sintering a blank and comprising an upper and a lower face, both of which have a support surface for mounting in a clamp mounting of a cutting tool, lateral faces connecting the upper and lower faces, and cutting edges which have chamfers.

Self-Toughened High-Strength Proppant and Methods Of Making Same

Methods are described to make strong, tough, and lightweight whisker-reinforced glass-ceramic composites through a self-toughening structure generated by viscous reaction sintering of a complex mixture of oxides. The present invention further relates to strong, tough, and lightweight glass-ceramic composites that can be used as proppants and for other uses.

Extrusion Process For Proppant Production

An extrusion method and apparatus are described for producing ceramics, glass, glass-ceramics, or composites suitable for use as proppants. The method includes forming one or more green body materials, extruding the green body materials to form a green body extrudate, separating and shaping the green body extrudate into individual green bodies, and sintering the green bodies to form proppants. The apparatus includes a means for forming an intimate mixture of green body materials, means to produce a green body extrudate, means for separating and shaping the green body extrudate into individual green bodies, and means to sinter the green green bodies to form proppants.

Refractory powder comprising coated mullite grains

A powder is disclosed having a coarse fraction representing more than 60% and less than 85% of the powder, as a weight percentage on the basis of the oxides, and that is constituted of particles having a size greater than or equal to 50 μm, referred to as “coarse particles”, the powder comprising at least 5% of coated grains having a size greater than or equal to 50 μm, as a weight percentage on the basis of the oxides of the powder, and a fine fraction, forming the balance to 100% as a weight percentage on the basis of the oxides, constituted of particles having a size of less than 50 μm, referred to as “matrix particles”. The powder can be applied in combustion chambers in which the temperature may reach 1400° C.

Alumina-Based Ceramic Materials and Process for the Production Thereof

The present invention provides a process for producing a ceramic material, which comprises: (a) forming a green compact by compacting a powder comprising alumina and carbon, wherein the powder is substantially free of silicon carbide and wherein the amount of carbon present in the powder does not exceed 0.1% by weight of the powder; and (b) sintering the green compact under non-oxidising conditions to form a ceramic material comprising alumina and carbon, wherein the green compact is sintered at a temperature of less than 1550° C. Ceramic materials obtainable by said process are also provided. 1. A process for producing a ceramic material , which comprises:(a) forming a green compact by compacting a powder comprising alumina and carbon, wherein the powder is substantially free of silicon carbide and wherein the amount of carbon present in the powder does not exceed 0.1% by weight of the powder; and(b) sintering the green compact under non-oxidising conditions to form a ceramic material comprising alumina and carbon, wherein the green compact is sintered at a temperature of less than 1550° C.2. A process according to claim 1 , wherein the powder comprises alumina particles having an average diameter of from about 1 nm to about 1 μm.3. A process according to claim 1 , wherein the powder contains carbon in the form of carbon particles.4. A process according to claim 3 , wherein the carbon particles have an average diameter of from about 1 nm to about 1 μm.5. A process according to claim 4 , wherein the particles are in the form of graphite particles.6. A process according to claim 1 , wherein the powder contains carbon in the form of an organic precursor.7. A process according to claim 1 , wherein carbon is present in the powder in an amount of from about 0.01% to about 0.05% by weight of the powder.8. A process according to claim 1 , wherein the green compact is sintered at a temperature of from about 1350° C. to about 1500° C.9. A process according to claim 1 , ...

Semiconductive ceramic sintered compact

There is provided a semiconductive ceramic sintered compact that has a conductivity high enough to attain static electricity removal and antistatic purposes and, at the same time, has excellent mechanical properties or stability over time. The semiconductive ceramic sintered compact includes a main phase and a conductive phase present between the main phases, wherein the main phase is a ceramic sintered phase including Al 2 O 3 particles, the area ratio of the conductive phase to the main phase is 0% (exclusive) to 10% (inclusive), and the conductive phase includes two or more metals selected from Mn (manganese), Fe (iron), and Ti (titanium) and has a composition meeting a relation of Mn/(Ti+Mn+Fe)>0.08 or Mn/Ti>0.15.

Component, in particular for a fitting, a piece of furniture and/or a domestic appliance, method for producing a component, and a fitting, piece of furniture and/or domestic appliance

A component for one or more of a fitting, a piece of furniture, and a domestic appliance. The component includes a formed body including one or more of a hard-material-containing composite, a metal-ceramic composite, and a hard material. A method of producing the component includes providing the formed body and shaping it by thermal spraying or mechanical forming.

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.

Compositions and methods for converting hazardous waste glass into non-hazardous products

The present invention provides compositions and methods for converting hazardous waste glass into safe and usable material. In particular, the present invention provides compositions and methods for producing ceramic products from toxic-metal-containing waste glass, thereby safely encapsulating the metals and other hazardous components within the ceramic products.

LIGHT-TRANSMITTING CERAMIC SINTERED BODY AND METHOD FOR PRODUCING SAME

The present invention relates to a light-transmitting ceramic sintered body which contains air voids having pore diameters of 1 μm or more but less than 5 μm at a density within the range of from 10 voids/mmto 4,000 voids/mm(inclusive), while having a closed porosity of from 0.01% by volume to 1.05% by volume (inclusive). With respect to this light-transmitting ceramic sintered body, a test piece having a thickness of 1.90 mm has an average transmittance of 70% or more in the visible spectrum wavelength range of 500-900 nm, and the test piece having a thickness of 1.90 mm has a sharpness of 60% or more at a comb width of 0.5 mm. 1. A light-transmitting ceramic sintered body containing air bubbles each having a pore size of 1 μm or more and less than 5 μm in an amount of 10 bubbles/mmor more and 4 ,000 bubbles/mmor less , and having a closed porosity of 0.01 vol % or more and 1.05 vol % or less; andhaving an average transmittance of a test specimen of the light-transmitting ceramic sintered body having a thickness of 1.90 mm of 70% or more with respect to a visible spectrum with a wavelength of 500 to 900 nm, and a clarity in a comb width of 0.5 mm of a test specimen of the light-transmitting ceramic sintered body having a thickness of 1.90 mm of 60% or more.2. A light-transmitting ceramic sintered body containing air bubbles each having a pore size of 1 μm or more and less than 5 μm in an amount of 10 bubbles/mmor more and 4 ,000 bubbles/mmor less , and having a closed porosity of 0.01 vol % or more and 1.05 vol % or less; andhaving an average transmittance of a test specimen of the light-transmitting ceramic sintered body having a thickness of 0.80 mm of 74% or more with respect to a visible spectrum with a wavelength of 500 to 900 nm, and a clarity in a comb width of 0.5 mm of a test specimen of the light-transmitting ceramic sintered body having a thickness of 0.80 mm of 75% or more.3. A light-transmitting ceramic sintered body containing air bubbles each having ...

Monolithic base and production method therefor

The monolithic base is a porous alumina body that includes pores and that is configured by alumina particles as an aggregate and an oxide phase as a binding material. The alumina particles include microscopic alumina particles having a particle diameter of greater than or equal to 0.5 μm and less than or equal to 5 μm and coarse alumina particles having a particle diameter of greater than 5 μm. The number of microscopic alumina particles that are encapsulated in the oxide phase is greater than or equal to 50% of the total number of microscopic alumina particles and coarse alumina particles.

GARNET MATERIALS FOR LI SECONDARY BATTERIES AND METHODS OF MAKING AND USING GARNET MATERIALS

Set forth herein are garnet material compositions, e.g., lithium-stuffed garnets and lithium-stuffed garnets doped with alumina, which are suitable for use as electrolytes and catholytes in solid state battery applications. Also set forth herein are lithium-stuffed garnet thin films having fine grains therein. Disclosed herein are novel and inventive methods of making and using lithium-stuffed garnets as catholytes, electrolytes and/or anolytes for all solid state lithium rechargeable batteries. Also disclosed herein are novel electrochemical devices which incorporate these garnet catholytes, electrolytes and/or anolytes. Also set forth herein are methods for preparing novel structures, including dense thin (<50 um) free standing membranes of an ionically conducting material for use as a catholyte, electrolyte, and, or, anolyte, in an electrochemical device, a battery component (positive or negative electrode materials), or a complete solid state electrochemical energy storage device. Also, the methods set forth herein disclose novel sintering techniques, e.g., for heating and/or field assisted (FAST) sintering, for solid state energy storage devices and the components thereof. 1123-. (canceled)124. A multilayer , comprising:a first layer comprising an unsintered lithium-stuffed garnet polycrystalline thin film, wherein the thickness of the first layer is less than 100 μm and greater than 10 nm; anda second layer comprising a metal foil or metal powder, wherein the second layer is in contact with the first layer, and wherein the metal foil or metal powder comprises a metal selected from nickel (Ni), copper (Cu), an alloy thereof, and a combination thereof.125. The multilayer of claim 124 , further comprising a third layer comprising an unsintered lithium-stuffed garnet polycrystalline thin film claim 124 , wherein the thickness of the third layer is less than 100 μm and greater than 10 nm claim 124 , wherein the second layer is between and in contact with the first ...

Plate-like alumina particle and a manufacturing method for the same

[Solving Means] The above problem is solved by providing a plate-like alumina particle including a step of firing an aluminum compound in the presence of a shape-controlling agent and a molybdenum compound serving as a fluxing agent. The above problem is solved also by providing a method for producing a plate-like alumina particle, the method including a step in which the aluminum compound and the molybdenum compound react with each other to form aluminum molybdate and a step in which the aluminum molybdate is decomposed to obtain the plate-like alumina particle.

CERAMIC SUBSTRATE AND SUSCEPTOR

A ceramic substrate made of a dielectric material including silicon carbide particles, which is used as a forming material, in which the number of the silicon carbide particles per unit area on the surface of the substrate is smaller than the number of the silicon carbide particles per unit area in a cross section of the substrate. 1. A ceramic substrate which is made of a dielectric material including silicon carbide particles as a forming material ,wherein the number of the silicon carbide particles per unit area on a surface of the substrate is smaller than the number of the silicon carbide particles per unit area in a cross section of the substrate.2. The ceramic substrate according to claim 1 , wherein an average particle diameter of the silicon carbide particles is 0.2 μm or less.3. A susceptor comprising:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'the ceramic substrate according to ,'}wherein a surface of the ceramic substrate is a mounting surface on which a plate-shaped sample is mounted.4. An electrostatic chuck device comprising: [{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'the ceramic substrate according to as a mounting plate,'}, 'a supporting plate,', 'an electrostatic attraction electrode provided between the ceramic substrate and the supporting plate, and', 'an insulating material layer that insulates surroundings of the electrostatic attraction electrode;, 'an electrostatic chuck part which includes'}a temperature adjusting base part; andan adhesive layer provided between the electrostatic chuck part and the temperature adjusting base part.5. The ceramic substrate according to claim 1 , wherein the dielectric material includesaluminum oxide particles or yttrium oxide particles having an average crystal grain size of 5 μm or less, as a main phase, andsilicon carbide particles having an average particle diameter of 0.2 μm or less, as a sub-phase.6. The ceramic substrate according to claim 1 , wherein the ceramic substrate is formed by a ...

ELECTROSTATIC CHUCK DEVICE AND METHOD FOR MANUFACTURING SAME

This electrostatic chuck device () includes a base () having one main surface serving as a mounting surface () on which a plate-shaped sample is mounted, and an electrode for electrostatic attraction () provided on the side opposite to the mounting surface () in the base (), in which the base () consists of a ceramic material as a forming material, and the ceramic material contains aluminum oxide and silicon carbide as main components thereof, and has a layered graphene present at a grain boundary of the aluminum oxide. 1. An electrostatic chuck device comprising:a base having one main surface serving as a mounting surface on which a plate-shaped sample is mounted; andan electrode for electrostatic attraction provided on a side opposite to the mounting surface in the base,wherein the base consists of a ceramic material, andthe ceramic material is a sintered body containing aluminum oxide and silicon carbide as main components thereof and having a layered graphene present at a grain boundary of the aluminum oxide.2. The electrostatic chuck device according to claim 1 ,wherein the sintered body further contains β-SiC type silicon carbide.3. The electrostatic chuck device according to claim 1 ,wherein a relative dielectric constant of the ceramic material at a frequency of 10 Hz is 12.3 or more, and a relative dielectric constant of the ceramic material at a frequency of 1 MHz is 12.5 or less.4. A method for manufacturing the electrostatic chuck device according to claim 1 , the method comprising:a step of heating a formed body obtained by forming granules composed of mixed particles of aluminum oxide particles and silicon carbide particles, at a temperature of 500° C. or lower with a rate of temperature rise of 0.3° C./min or more; anda step of sintering the formed body, which has been treated in the step of heating to form a sintered body containing aluminum oxide and silicon carbide as main components thereof and having a layered graphene present at a grain boundary ...

ELECTROSTATIC CHUCK DEVICE AND METHOD FOR MANUFACTURING ELECTROSTATIC CHUCK DEVICE

An electrostatic chuck device includes: a base having one principal surface which is a placing surface on which a plate-shaped sample is placed, wherein the base is made from a sintered compact of ceramic particles, which include silicon carbide particles and aluminum oxide particles, as a forming material; and an electrostatic attraction electrode which is provided on a surface of the base on the side opposite to the placing surface of the base, or in the interior of the base, in which the volume resistivity value of the sintered compact is 0.5×10Ωcm or more in the entire range from 24° C. to 300° C., a graph which shows the relationship of the volume resistivity value of the sintered compact to a temperature at which the volume resistivity value of the sintered compact is measured has a maximum value in the range from 24° C. to 300° C., and the amount of metal impurities in the sintered compact other than aluminum and silicon in the sintered compact is 100 ppm or less. 1. An electrostatic chuck device comprising:a base having one principal surface which is a placing surface on which a plate-shaped sample is placed, wherein the base is made from a sintered compact of ceramic particles, which include silicon carbide particles and aluminum oxide particles, as a forming material; andan electrostatic attraction electrode which is provided on a surface of the base on the side opposite to the placing surface of the base, or in an interior of the base,{'sup': '15', 'wherein a volume resistivity value of the sintered compact is 0.5×10Ωcm or more in an entire range from 24° C. to 300° C.,'}a graph which shows a relationship of the volume resistivity value of the sintered compact to a temperature at which the volume resistivity value of the sintered compact is measured has a maximum value in the range from 24° C. to 300° C., andthe amount of metal impurities in the sintered compact other than aluminum and silicon is 100 ppm or less.2. The electrostatic chuck device according ...

Ceramic composition and cutting tool

In a ceramic composition mainly composed of alumina (Al 2 O 3 ), tungsten carbide (WC) and zirconia (ZrO 2 ), zirconium (Zr) is distributed in a first grain boundary as an interface where an alumina (Al 2 O 3 ) crystal grain is adjacent to a tungsten carbide (WC) crystal grain and in a second grain boundary as an interface where two alumina (Al 2 O 3 ) crystal grains are adjacent to each other.

COMPOSITE SINTERED BODY, ELECTROSTATIC CHUCK MEMBER, ELECTROSTATIC CHUCK DEVICE, AND METHOD FOR PRODUCING COMPOSITE SINTERED BODY

A composite sintered body is a ceramic composite sintered body which includes metal oxide which is a main phase, and silicon carbide which is a sub-phase, in which crystal grains of the silicon carbide are dispersed in crystal grains of the metal oxide and at crystal grain boundaries of the metal oxide, and a proportion of the crystal grains of the silicon carbide dispersed in the crystal grains of the metal oxide is 25% or more in an area ratio with respect to a total crystal grains of the silicon carbide. 1. A composite sintered body which is a ceramic composite sintered body , comprising:a metal oxide which is a main phase; andsilicon carbide which is a sub-phase,wherein crystal grains of the silicon carbide are dispersed in crystal grains of the metal oxide and at crystal grain boundaries of the metal oxide, anda proportion of the crystal grains of the silicon carbide dispersed in the crystal grains of the metal oxide is 25% or more in an area ratio with respect to a total crystal grains of the silicon carbide.2. The composite sintered body according to claim 1 , wherein the metal oxide is aluminum oxide or yttrium oxide.3. The composite sintered body according to claim 1 , wherein an average crystal grain size of the metal oxide is 1.2 μm or more and 10 μm or less.4. An electrostatic chuck member comprising:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'a plate-shaped base which is formed of, as a forming material, the composite sintered body according to , the base having one principal surface which is a placing surface on which a plate-shaped sample is placed; and'}an electrostatic attraction electrode provided on a side opposite to the placing surface of the base, or in an interior of the base.5. An electrostatic chuck device comprising:{'claim-ref': {'@idref': 'CLM-00004', 'claim 4'}, 'the electrostatic chuck member according to .'}6. A method for producing a composite sintered body claim 1 , comprising:a step of mixing metal oxide particles and silicon ...

METHOD OF PRODUCING ALUMINA CERAMICS REINFORCED WITH OIL FLY ASH

A method for making ceramic composites via sintering a mixture of alumina and oil fly ash. The alumina is in the form of nanoparticles and/or microparticles. The oil fly ash may be treated with an acid prior to the sintering. The composite may comprise graphite carbon derived from oil fly ash dispersed in an alumina matrix. The density, mechanical performance (e.g. Vickers hardness, fracture toughness), and thermal properties (e.g. thermal expansion, thermal conductivity) of the ceramic composites prepared by the method are also specified. 1: A method of producing a composite comprising oil fly ash dispersed in an alumina matrix , the method comprising:mixing oil fly ash and alumina to form a mixture; andsintering the mixture thereby producing the composite,wherein:a weight ratio of the alumina to the oil fly ash is in a range of 9:1 to 500:1; andthe sintering comprises applying a uniaxial pressure ranging from 30-80 MPa to the mixture.2: The method of claim 1 , wherein the mixing involves sonication.3: The method of claim 1 , wherein the sintering is a spark plasma sintering process.4: The method of claim 1 , wherein the sintering is performed at a temperature ranging from 1 claim 1 ,200-1 claim 1 ,600° C.5: The method of claim 4 , wherein the sintering is performed with a holding time ranging from 5-60 minutes.6: The method of claim 1 , wherein the sintering comprises heating the mixture at a heating rate ranging from 50-150° C./min.7: The method of claim 1 , wherein the oil fly ash is treated with an acid prior to the mixing.8: The method of claim 1 , wherein the oil fly ash is devoid of nickel claim 1 , iron claim 1 , and vanadium.9: The method of claim 1 , wherein the oil fly ash is in the form of porous particles with an average particle size of 5-60 μm.10: The method of claim 9 , wherein the porous particles are spherical.11: The method of claim 1 , wherein the alumina comprises α-AlO.12: The method of claim 1 , wherein the alumina is in the form of particles ...

Method of making ceramic matrix slurry infused ceramic tows and ceramic matrix composites

Methods of making ceramic matrix prepregs are described. The methods include exposing a coated tow of ceramic fibers to a ceramic matrix slurry comprising a solvent and ceramic precursor. The coating is at least partially removed and the slurry infuses into the ceramic fibers to form prepreg. Steps to form ceramic matrix composites are also described, including forming the prepreg into a green body, and sintering the ceramic precursor.

CERAMIC MATERIAL AND ELECTROSTATIC CHUCK DEVICE

Provided is a composite sintered body for an electrostatic chuck, which is not easily broken even if it is exposed to high-power plasma. Further, provided are an electrostatic chuck device using such a composite sintered body for an electrostatic chuck and a method of manufacturing a composite sintered body for an electrostatic chuck. The composite sintered body for an electrostatic chuck is a composite sintered body including an insulating ceramic and silicon carbide, in which crystal grains of the silicon carbide are dispersed in at least one selected from the group consisting of a crystal grain boundary and a crystal grain of a main phase formed by sintering crystal grains of the insulating ceramic. 1. A ceramic material that is a composite sintered body including an insulating ceramic and silicon carbide ,wherein crystal grains of the silicon carbide are dispersed in at least one selected from the group consisting of a crystal grain boundary and a crystal grain of a main phase formed by sintering crystal grains of the insulating ceramic,a content of crystal grains having a β-SiC type crystal structure is more than 60% by volume with respect to a total amount of the crystal grains of the silicon carbide,the composite sintered body includes pores which are present in a crystal grain boundary, anda ratio of an apparent density of the composite sintered body with respect to a hypothetical true density when the composite sintered body is assumed not to include the pores is 97% or more.2. The ceramic material according to claim 1 ,wherein the ceramic material includes a portion in which the crystal grains having the β-SiC type crystal structure are sintered with each other.3. The ceramic material according to claim 1 ,wherein a grain diameter obtained from an X-ray diffraction result of the crystal grain of the silicon carbide is 50 nm or more.4. The ceramic material according to claim 1 ,wherein the insulating ceramic is aluminum oxide.5. A ceramic material which is ...

HEAT-RESISTANT MEMBER

A heat-resistant member of the present disclosure is formed of an alumina-based ceramic containing alumina crystals and a glass formed of Si, Ca, Mg, and O, and an area ratio occupied by the glass in an inner portion is larger than an area ratio occupied by the glass in the surface portion. 1. A heat-resistant member comprisingan alumina-based ceramic containing alumina crystals and a glass formed of Si, Ca, Mg, and O,wherein an area ratio occupied by the glass in an inner portion is larger than an area ratio occupied by the glass in a surface portion.2. The heat-resistant member according to claim 1 , wherein the area ratio occupied by the glass in the inner portion is larger than the area ratio occupied by the glass in the surface portion by 4 area % or more.3. The heat-resistant member according to claim 1 , wherein the area ratio occupied by the glass in the surface portion is 20 area % or less.4. The heat-resistant member according to claim 1 , wherein an average equivalent circle diameter of the alumina crystals in the surface portion is smaller than an average equivalent circle diameter of the alumina crystals in the inner portion.5. The heat-resistant member according to claim 1 , wherein a mean distance between centers of gravity of the alumina crystals in the surface portion is less than a mean distance between centers of gravity of the alumina crystals in the inner portion. The present disclosure relates to a heat-resistant member.A heat-resistant member that is less likely to be damaged even when used at a temperature of approximately 600° C. is used in a product that is assumed to be used at high temperatures, such as a heater used for heating the interior of a vehicle, for example.Here, as a material of the heat-resistant member, an alumina-based ceramic that is resistant to oxidation even at a temperature of approximately 600° C. in an atmospheric environment and that can be used for a long period of time is widely employed (see Patent Document 1, for ...

Porous shaped metal-carbon products

The present invention provides a porous metal-containing carbon-based material that is stable at high temperatures under aqueous conditions. The porous metal-containing carbon-based materials are particularly useful in catalytic applications. Also provided, are methods for making and using porous shaped metal-carbon products prepared from these materials.

DIELECTRIC MATERIAL AND ELECTROSTATIC CHUCKING DEVICE

A dielectric material includes a composite sintered body in which conductive particles are dispersed in an insulating material, in which a dielectric constant at a frequency of 40 Hz is 10 or higher, and a difference between a maximum dielectric loss value and a minimum dielectric loss value at a frequency of 1 MHz in a surface of the composite sintered body is 0.002 or less. 1. A dielectric material , whereinthe dielectric material is a composite sintered body in which conductive particles are dispersed in an insulating material,a dielectric constant of the dielectric material at a frequency of 40 Hz is 10 or higher, anda difference between a maximum value and a minimum value of dielectric loss of the dielectric material wherein the dielectric loss is measured at a frequency of 1 MHz on the surface of the composite sintered body is 0.002 or less.2. The dielectric material according to claim 1 ,{'sup': '13', 'wherein a volume resistivity at 20° C. of the dielectric material is 10Ω·cm or higher, and'}a withstand voltage at 20° C. of the dielectric material is 5 kV/mm or higher.3. The dielectric material according to claim 1 ,{'sup': '13', 'wherein a volume resistivity at 120° C. of the dielectric material is 10Ω·cm or higher, and'}a withstand voltage at 20° C. of the dielectric material is 5 kV/mm or higher.4. The dielectric material according to claim 1 ,wherein a thermal conductivity of the dielectric material is 20 W/m·K or higher.5. The dielectric material according to claim 1 ,wherein dielectric loss at a frequency of 40 Hz of the dielectric material is 0.01 or higher and 0.05 or lower.6. An electrostatic chuck device comprisinga base having a main surface on which a plate-like sample is electrostatically attracted,{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'wherein the base is formed of the dielectric material according to .'}7. The dielectric material according to claim 1 ,wherein the insulating material is an insulating ceramic.8. The dielectric ...

Honeycomb catalyst and exhaust gas purifying apparatus

A honeycomb catalyst includes a honeycomb unit. The honeycomb unit has a plurality of through holes that are arranged in parallel in a longitudinal direction and partitions that are provided between the plurality of through holes. The honeycomb unit includes a zeolite, inorganic particles, and an inorganic binder. The zeolite includes a CHA-structured aluminosilicate having a Si/Al ratio of about 15 to about 50. The inorganic particles includes an oxide that has a positive coefficient of thermal expansion. A volume ratio of the zeolite to the inorganic particles is about 50:about 50 to about 90:about 10.

PRE-STRESSED CURVED CERAMIC PLATES/TILES AND METHOD OF PRODUCING SAME

A pre-stressed curved plate comprising a curved plate having at least one concave surface, the curved plate being enveloped and adhesively bonded with tensioned reinforcing fibers, whereby the reinforcing fibers are first wound around the plate under tension being spaced apart from the concave surface and subsequently subjected to pressure to stretch and bond the reinforcing fibers to the surfaces of the plate, where upon bonding, the tensile strain of the fiber introduces stress in the plate. 1. A pre-stressed curved plate comprising:a curved ceramic plate having at least one concave surface; andreinforcing fibers that are wound around the ceramic plate,wherein the reinforcing fibers are under tension and adhesively bonded thereto, whereby the curved ceramic plate is maintained under compression stress.2. The curved plate in accordance with claim 1 , wherein the curved ceramic plate is a ceramic tile.3. The curved plate in accordance with claim 2 , wherein the ceramic plate is made of aluminum oxide (Al2O3); hot pressed claim 2 , sintered or reaction bonded boron carbide (B4C); silicon carbide (SiC); boron silicon carbide (BSC);titanium diboride (Ti B2); aluminum nitride; silicon nitride; and glass-ceramic, or combinations thereof.4. The curved plate in accordance with claim 1 , wherein the ceramic plate has a thickness between 3-30 mm.5. The curved plate in accordance with claim 1 , wherein the reinforcing fibers are selected from aramid claim 1 , poly(p-phenylene-2 claim 1 , 6-benzobisoxazole) claim 1 , S or E glass claim 1 , carbon claim 1 , thermoplastics (polyamide claim 1 , HMWPE claim 1 , polyethylene claim 1 , polypropylene) or metal (boron claim 1 , steel claim 1 , aluminum) fibers or their combination.6. The curved plate in accordance with claim 1 , wherein the adhesive is selected from epoxy claim 1 , phenolic claim 1 , thermoplastic claim 1 , thermosetting adhesives claim 1 , rubber or elastomer based adhesives and ceramic adhesives.7. The curved plate ...

EROSION-RESISTANT CERAMIC MATERIAL, POWDER, SLIP AND COMPONENT

The use of magnesium oxide, reactive alumina and aluminium oxide as a base provides for a new erosion-resistant material upon sintering. 1. A powder comprising (in % by weight):aluminum oxide in an amount of from 92.0% to <99.0%; andspinel in a proportion of 8.0%-1.0%.2. A powder comprising (in % by weight):from 96.0% to 99.9% of aluminum oxide; andreactive magnesium oxide in an amount of from 0.1% to 4.0%, to form spinel with the aluminum oxide present.3. The powder as claimed in claim 1 , which contains γ′-aluminum oxide.4. The powder as claimed in claim 1 , which contains α-alumina as aluminum oxide.5. The powder as claimed in claim 1 , which contains tabular aluminas as aluminum oxide.6. The powder as claimed in claim 1 , which contains reactive alumina as aluminum oxide as an additive for reducing a water content and for improving a processability in a ceramic slip claim 1 , in a proportion of from 10% by weight to 25% by weight.7. The powder as claimed in claim 5 , wherein the tabular alumina has at least three different particle size fractions.8. The powder as claimed in claim 6 , wherein the reactive alumina has at least two different particle size fractions.9. The powder as claimed in claim 5 , wherein the tabular aluminas have a maximum particle size of up to 10 mm.10. The powder as claimed in claim 2 , wherein the reactive magnesium oxide has a citric acid activity of from 10 seconds to 250 seconds.11. A ceramic produced using a powder as claimed in claim 1 , comprising at least (in % by weight):aluminum oxide as matrix material in an amount of from 92.0% to <99.0%; andspinel in a proportion of 8.0%-1.0%.12. The ceramic as claimed in claim 11 , wherein aluminum oxide is present as α-alumina.13. The ceramic as claimed in claim 11 , wherein aluminum oxide is present as tabular aluminas.14. The ceramic as claimed in claim 11 , wherein aluminum oxide is present as reactive alumina in order to reduce a water content and to improve a processability in a ceramic ...

ALUMINA-BASED FILLING SAND FOR SLIDING NOZZLE

An alumina-based filling sand for sliding nozzle comprising at least 50 wt % of mixed sand including 20 to 90 vol % of alumina sand and 80 to 10 vol % of silica sand, wherein the alumina sand has surface irregularities of 1.3 or less and comprises 50 wt % or more of an AlOcomponent. 1. An alumina-based filling sand for sliding nozzle comprising at least 50 wt % of mixed sand including 20 to 90 vol % of alumina sand and 80 to 10 vol % of silica sand , wherein the alumina sand has surface irregularities of 1.3 or less and comprises 50 wt % or more of an AlOcomponent.2. The alumina-based filling sand for sliding nozzle of claim 1 , wherein the alumina sand has 8 wt % or less of FeO.3. The alumina-based filling sand for sliding nozzle of claim 1 , wherein the alumina sand has an average particle diameter within a range from 0.2 to 1.0 mm.4. The alumina-based filling sand for sliding nozzle of claim 1 , wherein the silica sand had an average particle diameter within a range from 0.2 to 1.0 mm.5. The alumina-based filling sand for sliding nozzle of claim 1 , wherein the silica sand and the alumina sand both are coated with carbon claim 1 , or either the silica sand or the alumina sand is coated with carbon.6. The alumina-based filling sand for sliding nozzle of claim 1 , wherein the alumina sand has surface irregularities of 1.2 or less. The present invention relates to alumina-based filling sand for sliding nozzle. More specifically, the present invention relates to the alumina-based filling sand for sliding nozzle that forms an opening where the filling sand falls through smoothly without being molten and sintered by a molten metal (molten steel) poured into a ladle used in a steel mill and that does not allow the molten steel to permeate into the filling sand (in other words, the sand itself in a sliding nozzle is not melted and sintered by the molten steel and does not allow the molten steel to permeate into gaps between sand particles).A ladle for receiving molten ...

Composites of sintered Mullite reinforced corundum granules and method for its preparation

The present disclosure relates to a composite of sintered mullite reinforced corundum granules and a method for its preparation. The composite comprises mullite and corundum in an interlocking microstructure. The process for preparing the composite involves the steps of admixing the raw materials followed by sintering to obtain the composite comprising sintered mullite reinforced corundum granules. 1. A composite of sintered mullite reinforced corundum granules , comprising 6 to 80 wt % of mullite and 10 to 90 wt % of corundum , having particle size ranging from 0.25 mm to 1.5 mm;wherein, the mullite is obtained from clay and corundum is obtained from alumina ore; andwherein, the mullite and the corundum in the composite have an interlocking microstructure.2. The composite as claimed in claim 1 , wherein the clay is Kaolin.3. The composite as claimed in claim 1 , wherein the alumina ore is at least one selected from the group consisting of bauxite and aluminum trihydroxide.4. A method for preparing a composite of sintered mullite reinforced corundum granules comprising the following steps:a) grinding raw materials comprising at least one clay and at least one alumina ore, to obtain ground raw materials having particle size less than 45 microns;b) admixing the ground raw materials to obtain an admixture;c) granulating the admixture in the presence of at least one binder and optionally at least one additive to obtain granulated pellet; andd) sintering the granulated pellet in the temperature range of 1300° C. to 1600° C. to obtain the composite comprising sintered mullite reinforced corundum granules.5. The method as claimed in claim 4 , wherein the binder is at least one selected from the group consisting of bentonite claim 4 , starch and polyvinyl alcohol.6. The method as claimed in claim 4 , wherein the additive comprises at least one fluxing agent selected from the group consisting of potash feldspar and iron ore slime.7. The method as claimed in claim 4 , wherein ...

CERAMIC CORE COMPOSITIONS, METHODS FOR MAKING CORES, METHODS FOR CASTING HOLLOW TITANIUM-CONTAINING ARTICLES, AND HOLLOW TITANIUM-CONTAINING ARTICLES

The disclosure relates generally to core compositions and methods of molding and the articles so molded. More specifically, the disclosure relates to core compositions and methods for casting hollow titanium-containing articles, and the hollow titanium-containing articles so molded. 1. A ceramic core composition comprising calcium aluminate particles and one or more large scale particles.2. The composition of claim 1 , wherein the composition comprises fine scale calcium aluminate and wherein said large particles are hollow.3. The composition of claim 1 , wherein the calcium aluminate particles comprise particles of calcium monoaluminate.4. The composition of claim 1 , wherein the calcium aluminate particles comprise particles of calcium monoaluminate claim 1 , and calcium dialuminate.5. The composition of claim 1 , wherein the calcium aluminate particles comprise particles of calcium monoaluminate claim 1 , calcium dialuminate claim 1 , and mayenite.6. The composition of claim 1 , further comprising calcium aluminate with a particle size of less than about 50 microns.7. The composition of claim 1 , wherein large scale particles comprise hollow oxide particles.8. The composition of claim 1 , wherein said large scale particles are hollow and they comprise aluminum oxide particles claim 1 , magnesium oxide particles claim 1 , calcium oxide particles claim 1 , zirconium oxide particles claim 1 , titanium oxide particles claim 1 , or combinations thereof.9. The composition of claim 1 , wherein said large scale particles comprise a ceramic claim 1 , such as calcium aluminate claim 1 , calcium hexaluminate claim 1 , zirconia claim 1 , or combinations thereof.10. The composition of claim 7 , wherein said hollow oxide particles comprise hollow alumina spheres.11. The composition of claim 1 , wherein said large scale particles comprise particles that are more than about 70 microns in outside dimension.12. The composition of claim 1 , wherein the large scale particles ...

WEAR-RESISTANT COATING

A method of coating an object, the method comprising: preparing a suspension comprising graphene nanoplatelets and a ceramic material; and spraying the suspension onto the object using high velocity oxy-fuel, HVOF, spraying in which the suspension is introduced as a feedstock. 1. A method of coating an object , the method comprising:preparing a suspension comprising graphene nanoplatelets and a ceramic material; andspraying the suspension onto the object using high velocity oxy-fuel, HVOF, spraying in which the suspension is introduced as a feedstock.2. The method of claim 1 , wherein the suspension comprises graphene nanoplatelets having a thickness in the range 4 nm to 25 nm.3. The method of claim 1 , wherein the suspension comprises graphene nanoplatelets having an average thickness in the range 5 nm to 10 nm claim 1 , or in the range 6 nm to 8 nm.4. The method of claim 1 , wherein the suspension comprises graphene nanoplatelets having an average diameter in the range 1 μm to 7 μm claim 1 , or in the range 4 μm to 6 μm.5. The method of claim 1 , wherein the ceramic material is or comprises alumina; and/or gamma-phase alumina.6. (canceled)7. The method of claim 5 , wherein after SHVOF spraying the ceramic material comprises at least 50 wt % or at least 70 wt % or at least 90 wt % gamma-phase alumina.8. The method of claim 1 , wherein the wt % of graphene nanoplatelets in the suspension is in the range 1% to 30% of the wt % of the ceramic material in the suspension.9. The method of claim 1 , wherein spraying the suspension using SHVOF spraying comprises injecting the suspension into a flame claim 1 , and wherein the ratio of flame power to injection flow rate of the suspension is between 0.5 and 1.5 kW(ml/min) claim 1 , or between 0.8 and 1.2 kW(ml/min)and/or ii) the flame has a flame power between 80 kW and 120 kW.10. (canceled)11. The method of any preceding claim claim 1 , wherein preparing the suspension comprises:preparing a first suspension comprising the ...

ALUMINA CERAMIC

Provided is an alumina ceramic with a low secondary electron emission coefficient and suitable for components of a high frequency generator, a plasma generator and so on. The alumina ceramic contains alumina as a main component, and at least two kinds of elements selected from an alkaline earth metal and from an element belonging to period 3, 4 or 5. The alkaline earth metal and the element belonging to period 3, 4 or 5 have a higher first ionization energy than aluminum. An electronegativity difference between the alkaline earth metal and the element belonging to period 3, 4 or 5 is 0 or more and 0.6 or less. A ratio (x/y) of the grain boundary area (x) to the grain area (y) in the alumina ceramic is 0.0001 to 0.001. 1. An alumina ceramic comprising alumina as a main component , and at least two kinds of elements selected from an alkaline earth metal and from an element belonging to period 3 , 4 or 5 , whereinthe alkaline earth metal and the element belonging to period 3, 4 or 5 have a higher first ionization energy than aluminum,an electronegativity difference between the alkaline earth metal and the element belonging to period 3, 4 or 5 is 0 or more and 0.6 or less, anda ratio (x/y) of the grain boundary area (x) to the grain area (y) in the alumina ceramic is 0.0001 to 0.001.2. The alumina ceramic according to claim 1 , wherein the density is 3.8 g/cmor more and 4.0 g/cmor less.3. The alumina ceramic according to claim 1 , wherein the alumina ceramic is used in a high frequency generator and a plasma generator.4. The alumina ceramic according to claim 2 , wherein the alumina ceramic is used in a high frequency generator and a plasma generator. The present invention relates to alumina ceramic used as components of a high frequency generator and a plasma generator.Dielectric ceramic is used as components of a high frequency generator and a plasma generator. Utilization of the dielectric ceramics has recently become popular in a region of 3 GHz or higher, and low ...

Systems and Methods for Thermally Processing CMC Components

Systems and methods for thermally processing composite components are provided. In one exemplary aspect, a system includes a thermal system, a mover device, and a control system. The system also includes a plurality of vessels in which one or more components may be placed. The vessels are similarly shaped and configured. A vessel containing the one or more components therein may be mounted into a chamber defined by the thermal system during thermal processing. The thermal system and vessels include features that allow components to be thermally processed, e.g., compacted, burnt-out, and densified via a melt-infiltration process, a polymer impregnation and pyrolyzing process, or a chemical vapor infiltration process. utilizing the same thermal system and common vessel design. The control system may control the thermal system and mover device to automate thermal processing of the composite components. 19.-. (canceled)10. A system for manufacturing a composite component , the system comprising:a thermal system defining a chamber;a plurality of vessels each removably mountable within the chamber, wherein the composite component is removably insertable into a volume of any one of the plurality of vessels;a mover device for inserting and removing the composite component into and from any one of the plurality of vessels and mounting and removing any one of the plurality of vessels to and from the chamber of the thermal system; control the mover device to mount a first vessel of the plurality of vessels having the composite component in a first state into the chamber of the thermal system;', 'activate the thermal system to perform a first thermal process to transition the composite component from the first state to a second state;', 'control the mover device to remove the first vessel having the composite component in the second state from the chamber of the thermal system;', 'control the mover device to insert the composite component in the second state into a second ...

EROSION-RESISTANT CERAMIC MATERIAL, POWDER, SLIP AND COMPONENT

The use of magnesium oxide, reactive alumina and aluminium oxide as a base provides for a new erosion-resistant material upon sintering. 1. A powder comprising (in % by weight):from 96.0% to 99.9% of aluminum oxide; andreactive magnesium oxide in an amount of from 0.1% to 4.0%, to form spinel with the aluminum oxide present.2. The powder as claimed in claim 1 , wherein the reactive magnesium oxide has a citric acid activity of from 10 seconds to 250 seconds.3. A ceramic produced using the powder as claimed in claim 1 , comprising at least (in % by weight):aluminum oxide as matrix material in an amount of from 92.0% to <99.0%; andspinel in a proportion of 8.0%-1.0%.4. The ceramic as claimed in claim 3 , wherein aluminum oxide is present as α-alumina.5. The ceramic as claimed in claim 3 , wherein aluminum oxide is present as tabular aluminas.6. The ceramic as claimed in claim 3 , wherein aluminum oxide is present as reactive alumina to reduce a water content and to improve a processability in a ceramic slip.7. A component comprising the ceramic as claimed in or produced from a powder or a slip.8. The component as claimed in claim 7 , wherein 90% of pores are smaller than 5 μm.9. The component as claimed in comprising aluminum oxide and spinel. This application is a divisional application of U.S. application Ser. No. 16/466,070, filed Jun. 03, 2019, and entitled “EROSION-RESISTANT CERAMIC MATERIAL, POWDER, SLIP AND COMPONENT,” which claims priority to PCT Application No. PCT/EP2017/078718, having a filing date of Nov. 9, 2017, which is based on German Application No. 10 2016 224 443.4, having a filing date of Dec. 8, 2016, the entire contents all of which are hereby incorporated by reference.The following relates to an erosion-resistant ceramic material, a powder, slip and a component.Ceramic heat shields (CHS) as example of components made of ceramic material display corrosion and erosion on the hot gas side during use. This process is due to the corrosion of the ...

PREPARATION METHOD FOR CERAMIC COMPOSITE MATERIAL, CERAMIC COMPOSITE MATERIAL, AND WAVELENGTH CONVERTER

Provided is a ceramic composite material and a wavelength converter. The ceramic composite material includes: an alumina matrix, a fluorescent powder uniformly distributed in the alumina matrix, and scattering centers uniformly distributed in the alumina matrix, wherein the alumina matrix is an alumina ceramics, the scattering centers are alumina particles, the alumina particles each have a particle diameter of 1 μm to 10 μm, and the fluorescent powder has a particle diameter of 13 μm to 20 μm.

Method for preparing continuous fiber-reinforced ceramic matrix composite by flash sintering technology

The present disclosure discloses a method for preparing a continuous fiber-reinforced ceramic matrix composite by flash sintering technology, including: placing a continuous ceramic fiber preform in a mold, adding a nano-ceramic powder, and subjecting the resultant to mechanical oscillation and press forming in sequence to obtain a green body; heating the green body to a preset temperature and applying an electric field with a preset electric field intensity, until occurrence of flash sintering; and converting a power supply from a constant voltage state to a constant current state, holding at the temperature and cooling to obtain the continuous fiber-reinforced ceramic matrix composite.

Disk and process for producing base material for disk, and disk roll

The present invention relates to a process for producing a base material for disks of disk rolls, in which the disk roll contains a rotating shaft and a plurality of the disks fitted on the rotating shaft by insertion whereby the outer peripheral surface of the disks serves as a conveying surface, in which the process contains molding a slurry raw material containing inorganic fibers, an inorganic filler having an aspect ratio of from 1 to 25 and an inorganic binder into a plate shape; and drying the molded plate.

Hybrid nanocomposite coatings and applications thereof

In one aspect, articles are described herein comprising refractory coatings employing alumina-based hybrid nanocomposite architectures. A coated article described herein comprises a substrate and a coating deposited by CVD adhered to the substrate, the coating including a composite refractory layer having a matrix phase comprising alumina and at least one particulate phase within the matrix phase, the particulate phase comprising nanoscale to submicron particles formed of at least one of an oxycarbide and oxycarbonitride of one or more metals selected from the group consisting of aluminum and Group IVB metals.

METHOD OF FORMING A HIGH THERMAL CONDUCTIVITY COMPOSITE DIELECTRIC MATERIAL

Disclosed herein are embodiments of materials having high thermal conductivity along with a high dielectric constants. In some embodiments, a two phase composite ceramic material can be formed having a contiguous aluminum oxide phase with a secondary phase embedded within the continuous phase. Example secondary phases include calcium titanate, strontium titanate, or titanium dioxide. 1. A method of forming a composite ceramic material , the method comprising:{'sub': 3', '3, 'mixing together materials that will form out a primary phase of aluminum oxide, a first secondary phase of CaTiOlocated within the primary phase, and a second secondary phase of LaAlOlocated within the primary phase, the materials forming the primary phase being generally non-reactive with materials forming the first and second secondary phases; and'}{'sup': −1', '−1, 'sintering the materials to form a composite ceramic having the primary phase and the first and second secondary phases, the composite ceramic having a dielectric constant of greater than 20 and a thermal conductivity of greater than 20 W·m·K.'}2. The method of wherein the composite ceramic has a thermal conductivity of greater than 30 W·m·K.3. The method of wherein the primary phase is generally contiguous.4. The method of wherein the composite ceramic has a dielectric constant of greater than 25.5. The method of wherein the composite ceramic has a dielectric constant of greater than 35.6. The method of wherein the composite ceramic has a temperature drift of resonant frequency lower than 1000 ppm/Degree C.7. The method of further comprising machining the composite ceramic.8. The method of further comprising forming a radiofrequency component from the composite ceramic.9. A method of forming a composite ceramic material claim 7 , the method comprising:{'sub': 3', '2', '6, 'mixing together materials that will form out a primary phase of aluminum oxide, a first secondary phase of CaTiOlocated within the primary phase, and a second ...

Composite ceramic layered body and manufacturing method

Provided is a composite ceramic layered body, including: a substrate; and a composite ceramic that coats the substrate, the composite ceramic including a nitride phase and an oxide phase having an elastic modulus that differs from an elastic modulus of the nitride phase by 10% or more. The composite ceramic includes, among the nitride phase and the oxide phase, a first phase that occupies a largest area ratio, and a toughening phase that occupies an area ratio of 1% or more and has a largest difference in elastic modulus from an elastic modulus of the first phase. In a case in which the first phase is the nitride phase, the toughening phase is the oxide phase, and in a case in which the first phase is the oxide phase, the toughening phase is the nitride phase.

AGGLOMERATE ABRASIVE GRAIN

The present invention relates to an agglomerate abrasive grain made up of a plurality of individual abrasive grains which are bonded into an inorganic or organic binder matrix, wherein, based on the total weight of the agglomerate abrasive grain, at least 8% by weight of the abrasive grains which are bonded into the matrix are fused alumina-based polycrystalline alumina abrasive grains with a percentage of more than 97% by weight of alpha-alumina, and wherein the polycrystalline alumina abrasive grains, in turn, are made up of a plurality of AlOprimary crystals with a crystal size of between 20 μm and 100 μm. The agglomerate abrasive grain has a closed macroporosity with a pore volume of between 5% by volume and 30% by volume, wherein the average pore diameter of the closed macropores is between 10 μm and 100 μm and their maximum pore diameter is in the range of approx. 120 μm. 1. An agglomerate abrasive grain made up of a plurality of individual abrasive grains which are bonded into an inorganic or organic binder matrix ,wherein{'sub': 2', '3, 'based on the total weight of the agglomerate abrasive grain, at least 8% by weight of the abrasive grains which are bonded into the binder matrix are fused alumina-based polycrystalline alumina abrasive grains with a percentage of more than 97% by weight of alpha-alumina, wherein the polycrystalline alumina abrasive grains, in turn, are made up of a plurality of AlOprimary crystals with a crystal size of between 20 μm and 100 μm.'}2. The agglomerate abrasive grain according to claim 1 ,whereinin addition to the polycrystalline alumina abrasive grains, individual compact monolithic abrasive grains are additionally bonded into the binder matrix.3. The agglomerate abrasive grain according to claim 2 ,whereinthe average grain size of the individual compact monolithic abrasive grains lies between the maximum grain size of the polycrystalline alumina abrasive grains and the minimum crystal size of the primary crystals which are ...

Alumina sintered body production method and alumina sintered body

A method for producing an alumina sintered body, comprising: molding an alumina powder to obtain an alumina article, the alumina powder comprising alumina particles having a particle diameter of not less than 0.1 μm and less than 1 μm, and alumina particles having a particle diameter of not less than 1 μm and less than 100 μm; forming a carbon powder-containing layer on a surface of the alumina article to obtain a laminate body; and irradiating a surface of the carbon powder-containing layer of the laminate body with a laser light to form a transparent alumina sintered portion.

REFRACTORY OBJECT AND PROCESS OF FORMING A GLASS SHEET USING THE REFRACTORY OBJECT

A refractory object can include at least approximately 10 wt % AlOand at least approximately 1 wt % SiO. In an embodiment, the refractory object can include an additive. In a particular embodiment, the additive can include TiO, YO, SrO, BaO, CaO, TaO, FeO, ZnO, or MgO. The refractory object can include at least approximately 3 wt % of the additive. In an additional embodiment, the refractory object can include no greater than approximately 8 wt % of the additive. In a further embodiment, the creep rate of the refractory object can be at least approximately 1×10h. In another embodiment, the creep rate of the refractory object can be no greater than approximately 5×10h. In an illustrative embodiment, the refractory object can include a glass overflow trough or a forming block. 1. A refractory object comprising:{'sub': 2', '3', '2', '3', '2', '3, 'AlOat a content in a range of approximately 10 wt % AlOto approximately 94 wt % AlO;'}{'sub': 2', '2, 'SiOat a content of at least approximately 1.1 wt % SiO;'}{'sub': 2', '2', '3, 'an additive at a content of at least 0.2 wt % additive, wherein the additive includes TiO, YO, CaO, MgO, or any combination thereof; and'}{'sup': −4', '−1, 'wherein a creep rate of the refractory object is no greater than approximately 1×10h.'}2. The refractory object as recited in claim 1 , wherein the apparent porosity of the refractory object is no greater than approximately 0.8 vol %.3. The refractory object as recited in claim 1 , wherein the refractory object includes no greater than approximately 8 wt % of the additive.4. The refractory object as recited in claim 1 , wherein the refractory object includes no greater than approximately 1 wt % of an alkali metal oxide.5. The refractory object as recited in claim 1 , wherein the refractory object includes at least approximately 0.2 wt % YO.6. The refractory object as recited in claim 1 , wherein the refractory object comprises no greater than approximately 0.3 wt % ZrO.7. The refractory object ...

CERMET MATERIAL

A cermet material, including a plurality of ceramic particles defining a ceramic portion; and a plurality of high magnetic permeability metallic particles distributed throughout the ceramic portion to define an admixture. The ceramic particles and the metallic particles are generally the same size and shape. Each respective high magnetic permeability metallic particle has a magnetic permeability of at least 0.0001 H/m. The ceramic particles are selected from the group consisting of zirconia, yttria stabilized zirconia, zirconia toughened alumina, alumina, gadolinium oxide, TiB, ZrB, HfB, TaB, TiC, CrC, and combinations thereof. 1. A cermet precursor material , comprising:a plurality of ceramic particles defining a ceramic portion; anda plurality of high magnetic permeability metallic particles distributed throughout the ceramic portion to define an admixture;wherein the ceramic particles and the metallic particles are generally the same size and shape;wherein each respective high magnetic permeability metallic particle has a magnetic permeability of at least 0.0001 H/m; and{'sub': 2', '2', '2', '2', '3', '2, 'wherein the ceramic particles are selected from the group consisting of zirconia, yttria stabilized zirconia, zirconia toughened alumina, alumina, gadolinium oxide, TiB, ZrB, HfB, TaB, TiC, CrC, and combinations thereof.'}2. The cermet precursor of claim 1 , wherein the admixture is homogeneous.3. The cermet precursor of wherein the high magnetic permeability metallic particles are selected from the group consisting of mu-metal claim 1 , soft ferrite claim 1 , and combinations thereof.4. A metal detectible plastic material claim 1 , comprising:a plurality of plastic particles defining a plastic portion; anda plurality of high magnetic permeability metallic particles distributed throughout the plastic portion to define an admixture;wherein the plastic particles and the metallic particles are generally the same size and shape;wherein each respective high magnetic ...

Ceramic matrix composite reinforced material

A CMC article may include a CMC substrate defining a major surface and a plurality of CMC reinforcing pins at least partially embedded in the CMC substrate. Each CMC reinforcing pin of the plurality of CMC reinforcing pins defines a respective long axis. The respective long axes may be oriented at an angle substantially perpendicular to the major surface of the CMC substrate. A method may include inserting a plurality of CMC reinforcing pins into a major surface of a ceramic fiber preform. Each CMC reinforcing pin of the plurality of CMC reinforcing pins defines a respective long axis. As the plurality of CMC reinforcing pins are inserted into the major surface, the respective long axes may be oriented at an angle substantially perpendicular to the major surface. The method also includes forming a matrix of material within pores of the ceramic fiber preform to form a CMC article.

Whisker reinforced high fracture toughness ceramic threaded fasteners

A high temperature fastener including a bolt and a nut, where the bolt and the nut are constructed of an aluminum oxide ceramic material reinforced with silicon-carbide crystal whiskers or silicon nitride.

POROUS MATERIAL AND PREPARATION METHOD THEREOF

A porous material having a hierarchical pore structure, wherein a size and shape of interconnection parts of at least one level pore cavities is consistent with a size and shape of interconnection parts between the level pore cavities and the previous level pore cavities thereof, and an average value of equivalent diameters of the interconnection parts is larger than 45% of that of a diameter of small pore cavities of two adjacent pore cavities of the interconnection parts. The method for preparing the porous material includes: mixing a raw material powder with a pore-forming agent used for preparing the smallest level pores to formulate a slurry; uniformly filling the slurry into a polymeric material frame, and drying and crushing to form mixed grains; then uniformly mixing the mixed grains with the pore-forming agent used for preparing the upper-level pore cavities, forming a compact green body and sintering. 1. A porous material , comprising a material body , wherein the material body comprises pore cavities graded by pore size of the material and cavity walls surrounding the pore cavities , and lower-level pore cavities are arranged on cavity walls of upper-level pore cavities formed by surrounding a three-dimensional space; wherein pore cavities of same level are interconnected with each other , and pore cavities of different levels are also interconnected with each other , and a size and shape of interconnection parts of at least one level pore cavities is consistent with a size and shape of interconnection parts between the one level pore cavities and previous level pore cavities thereof , and an average value of an equivalent diameter of the interconnection parts is larger than 45% of that of a diameter of small pore cavities of two adjacent pore cavities of the interconnection parts.2. The porous material according to claim 1 , wherein porous material of each level in the material body is a continuous structure.3. The porous material according to claim 2 , ...

PERMANENT FILTER FOR A STERILIZATION CONTAINER, STERILIZATION CONTAINER AND METHOD FOR PRODUCING A PERMANENT FILTER

A permanent filter for a medical sterilization container is provided. The permanent filter is made from a ceramic. The ceramic is made from globular substrate grains. A medical sterilization container is also provided, in particular for receiving and storing objects to be sterilized, having a container bottom part and a container top part for closing the container bottom part in a closed position of the sterilization container. At least one of the container bottom part and the container top part have a gas exchange orifice, which is closed with a permanent filter. The permanent filter is made from a ceramic and the ceramic is made from globular substrate grains. In addition, a method is provided for producing a permanent filter for a medical sterilization container. The permanent filter is produced from a ceramic material by sintering. Globular substrate grains are used as the ceramic material. 1. A permanent filter for a medical sterilization container , wherein the permanent filter is made from a ceramic and wherein the ceramic is made from globular substrate grains.2. The permanent filter according to claim 1 , wherein the permanent filter is self-supporting claim 1 , without a support element.3. The permanent filter according to claim 1 , wherein the substrate grains are produced bydispersing and deagglomerating ceramic powder in aqueous suspension to produce individual primary grains,spray drying the suspension containing the primary grains andcalcining the primary grains to yield secondary grains, which form the globular substrate grains.4. The permanent filter according to claim 3 , wherein the ceramic powder is aluminium oxide (AlO) claim 3 , zirconium oxide (ZrO) claim 3 , titanium dioxide (TiO) claim 3 , mullite claim 3 , silicate claim 3 , kaolin or any desired mixture thereof.5. The permanent filter according to claim 4 , wherein the ceramic powder is γ-aluminium oxide (γ-AlO).6. The permanent filter according to claim 3 , wherein the globular substrate ...

STRUCTURAL AND MECHANICAL PROPERTIES OF NANO AND MICRO AL2O3-CBN COMPOSITES PREPARED BY SPARK PLASMA SINTERING

Conventional sintering processes convert a portion of cBN to hBN which is softer than cBN which negatively affects functional properties of an alumina composite. The invention is directed to method for making an alumina-cubic boron nitride (AlO-cBN) composite that contains substantially no hexagonal boron nitride (hBN) by non-conventional spark plasma sintering of cBN with nano-sized alumina particles. The invention is also directed to AlO-cBN/Ni composites, which contain substantially no hBN, and which exhibit superior physical and mechanical properties compared to alumina composites containing higher amounts of hBN. 1. A method for making an alumina-cubic boron nitride (“AlO-cBN”) composite comprising spark plasma sintering cBN particles with nano-sized alumina particles; wherein an average particle size of the nano-sized alumina particles is no more than 50 nm.2. The method of claim 1 , wherein the cBN particles are substantially cBN without a nickel coating.3. The method of claim 1 , wherein the cBN particles are coated with nickel.4. The method of claim 1 , wherein the cBN particles are coated with nickel and comprise 20-80 wt % nickel claim 1 , based on a total weight of the nickel-coated cBN particles.5. The method of claim 1 , wherein the cBN particles are coated with nickel and comprise 50-70 wt % nickel claim 1 , based on a total weight of the nickel-coated cBN particles.6. The method of claim 1 , wherein an average particle size of the nano-sized alumina particles is no more than 2 nm.7. The method of claim 1 , wherein an average particle size of the nano-sized alumina particles is no more than 10 nm.8. The method of claim 1 , wherein an average particle size of the nano-sized alumina particles is no more than 5 nm.9. The method of claim 1 , wherein an average particle size of the nano-sized alumina particles is no more than 2 nm.10. The method of claim 1 , wherein an average particle size of the cBN particles ranges from 1 to 100 μm.11. The method of ...

CERAMIC SLURRIES FOR ADDITIVE MANUFACTURING TECHNIQUES

A ceramic slurry for forming a ceramic article includes a binder, a first plurality of ceramic particles having a first morphology, a second plurality of ceramic particles having a second morphology that is different from the first morphology; and a photoinitiator. A method for using this slurry for fabricating ceramic articles is presented as well. 1. A ceramic slurry for forming a ceramic article , comprising:a binder;a first plurality of ceramic particles having a first morphology;a second plurality of ceramic particles having a second morphology that is different from the first morphology; anda photoinitiator.2. The ceramic slurry of claim 1 , wherein the first plurality of particles has a median sphericity that is greater than a median sphericity of the particles of the second plurality.3. The ceramic slurry of claim 2 , wherein the median sphericity of the particles of the first plurality is at least 0.9.4. The ceramic slurry of claim 1 , wherein total particle loading of the slurry is in a range from about 45 percent to about 75 percent by volume of slurry.5. The ceramic slurry of claim 1 , wherein the first plurality is present in the slurry as from about 20 percent to about 99 percent by volume of total ceramic material present in the slurry.6. The ceramic slurry of claim 1 , wherein the second plurality is present in the slurry as from about 1 percent to about 80 percent by volume of total ceramic material present in the slurry.7. The ceramic slurry of claim 1 , wherein a first median particle size (d) of the first plurality of ceramic particles is different from a second median particle size (d) of the second plurality of ceramic particles claim 1 , and wherein the first and second dare between approximately 2 microns (μm) and 25 μm.8. The ceramic slurry of claim 7 , wherein the first median particle size of the first plurality of ceramic particles is in a range from about 8 microns to about 15 microns.9. The ceramic slurry of claim 7 , wherein the second ...

Ceramic structured body and sensor element of gas sensor

A sensor element of a gas sensor includes: an element base which is a ceramic structured body including a detection part of detecting a target measurement gas component; an outer protective layer which is a porous layer provided in at least a part of an outermost peripheral portion of the element base; and an inner protective layer which is a porous layer having a degree of porosity of 30% to 85%, which is larger than a degree of porosity of the outer protective layer, inside the outer protective layer, wherein an average fine pore diameter of the inner protective layer is equal to or larger than 0.5 μm and equal to or smaller than 5.0 μm.

Cutting insert

A cutting insert has only cutting edge portion thereof made of SiC whisker reinforced ceramics brazed to the shank with active solder. This provides improved cutting performance by increased toughness and high strength of the SiC whisker reinforced ceramics without limitation in shape while reducing manufacturing costs. The cutting insert includes a cutting edge portion made of SiC whisker reinforced ceramics, and a shank to which the cutting edge portion is mounted. The cutting edge portion is brazed to the shank using an active solder, and the whiskers are disorderedly arranged and agglomerated in the cutting edge portion.

BORON ALUMINUM SILICATE MINERAL MATERIAL, LOW TEMPERATURE CO-FIRED CERAMIC COMPOSITE MATERIAL, LOW TEMPERATURE CO-FIRED CERAMIC, COMPOSITE SUBSTRATE AND PREPARATION METHODS THEREOF

The present invention relates to a boroaluminosilicate mineral material, a low temperature co-fired ceramic composite material, a low temperature co-fired ceramic, a composite substrate and preparation methods thereof. A boroaluminosilicate mineral material for a low temperature co-fired ceramic, the boroaluminosilicate mineral material comprises the following components expressed in mass percentages of the following oxides: 0.41%-1.15% of Na2O, 14.15%-23.67% of K2O, 1.17%-4.10% of CaO, 0-2.56% of Al2O3, 13.19%-20.00% of BO, and 53.47%-67.17% of SiO. The aforementioned boroaluminosilicate mineral material is chemically stable; a low temperature co-fired ceramic prepared from it not only has excellent dielectric properties, but also has a low sintering temperature, a low thermal expansion coefficient, and high insulation resistance; it is also well-matched with the LTCC process and can be widely used in the field of LTCC package substrates. 3. A low temperature co-fired ceramic composite material claim 1 , wherein the low temperature co-fired ceramic composite material comprises claim 1 , in mass percentage claim 1 , 35% to 65% of AlOand 35% to 65% of the boroaluminosilicate mineral material according to .4. The low temperature co-fired ceramic composite material according to claim 1 , wherein the low temperature co-fired ceramic composite material comprises 41.69% to 62.53% of AlOand 37.47% to 58.31% of the boroaluminosilicate mineral material according to .5. A method for preparing a boroaluminosilicate mineral material claim 1 , wherein it comprises the following steps:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'weighing a sodium source, a potassium source, a calcium source, an aluminum source, a boron source, and a silicon source according to a ratio of elements of the boroaluminosilicate mineral material according to ; mixing and grinding to obtain a boroaluminosilicate mineral grinding slurry;'}subjecting the boroaluminosilicate mineral grinding slurry ...

PREPARATION METHOD FOR CERAMIC COMPOSITE MATERIAL, CERAMIC COMPOSITE MATERIAL, AND WAVELENGTH CONVERTER

A preparation method for a ceramic composite material, a ceramic composite material, and a wavelength converter. The preparation method comprises: preparing an aluminium salt solution and a fluorescent powder; dispersing the fluorescent powder into a buffer solution having a pH 4.5-5.5 to obtain a suspension; titrating the suspension with the aluminium salt solution to obtain a fluorescent powder coated with AlOhydrate film; calcining the fluorescent powder coated with AlOhydrate film to obtain a AlO-coated fluorescent powder; mixing aluminium oxide powder with a particle size of 0.1 μm-1 μm and aluminium oxide powder with a particle size of 1 μm-10 μm to obtain mixed aluminium oxide powder; mixing the AlO-coated fluorescent powder and the mixed aluminium oxide powder to obtain mixed powder, the AlO-coated fluorescent powder being present in 40%-90% by weight of the mixed powder; and pre-pressing and sintering the mixed powder to obtain the ceramic composite material. 1. A method for preparing a ceramic composite material , comprising:{'sub': 2', '3, 'preparing an aluminum salt solution and a fluorescent powder according to a mass ratio of AlOto fluorescent powder of (0.1 to 1):100;'}dispersing the fluorescent powder in a buffer solution with a pH value of 4.5 to 5.5 to obtain a suspension;{'sub': 2', '3, 'titrating the suspension with the aluminum salt solution to obtain a fluorescent powder coated with an AlOhydrate film;'}{'sub': 2', '3', '2', '3, 'calcining the fluorescent powder coated with the AlOhydrate film to obtain an AlO-coated fluorescent powder;'}mixing an alumina powder having a particle diameter of 0.1 μm to 1 μm and an alumina powder having a particle diameter of 1 μm to 10 μm according to a molar ratio of 100:(0.1 to 5), so as to obtain a mixed alumina powder;{'sub': 2', '3', '2', '3, 'mixing the AlO-coated fluorescent powder and the mixed alumina powder to obtain a mixed powder, wherein the AlO-coated fluorescent powder accounts for 40% to 90% by ...

Method for producing ceramic composite

A method for producing a ceramic composite includes: preparing a sintered body in a plate form containing a fluorescent material having a composition of a rare earth aluminate, and aluminum oxide; and eluting the aluminum oxide from the sintered body by contacting the sintered body with a basic substance, for example, contained in an alkali aqueous solution, and the dissolution amount of the fluorescent material eluted from the sintered body in the step of eluting the aluminum oxide is 0.5% by mass or less based on an amount of the fluorescent material contained in the sintered body as 100% by mass.

REFRACTORY OBJECT AND PROCESS OF FORMING A GLASS SHEET USING THE REFRACTORY OBJECT

A refractory object can include at least approximately 10 wt % AlOand at least approximately 1 wt % SiO. In an embodiment, the refractory object can include an additive. In a particular embodiment, the additive can include TiO, YO, SrO, BaO, CaO, TaO, FeO, ZnO, or MgO. The refractory object can include at least approximately 3 wt % of the additive. In an additional embodiment, the refractory object can include no greater than approximately 8 wt % of the additive. In a further embodiment, the creep rate of the refractory object can be at least approximately 1×10h. In another embodiment, the creep rate of the refractory object can be no greater than approximately 5×10h. In an illustrative embodiment, the refractory object can include a glass overflow trough or a forming block. 1. A refractory object comprising:{'sub': 2', '3', '2', '3', '2', '3, 'AlOat a content in a range of 10 wt % AlOto 94 wt % AlO;'}{'sub': 2', '2, 'SiOat a content of at least 1.1 wt % SiO;'}an additive at a content of at least 0.2 wt % additive, wherein the additive includes CaO, MgO, or any combination thereof.2. The refractory object as recited in claim 1 , wherein the apparent porosity of the refractory object is no greater than 0.8 vol %.3. The refractory object as recited in claim 1 , wherein the refractory object includes no greater than 8 wt % of the additive.4. The refractory object as recited in claim 1 , wherein the refractory object includes no greater than 1 wt % of an alkali metal oxide.5. The refractory object as recited in claim 1 , wherein the refractory object includes at least 0.2 wt % YO.6. The refractory object as recited in claim 1 , wherein the refractory object comprises no greater than 0.3 wt % ZrO.7. The refractory object as recited in claim 1 , wherein the refractory object includes at least 0.2 wt % TiO.8. The refractory object as recited in claim 7 , wherein the refractory object includes no greater than 4.0 wt % TiO.9. The refractory object as recited in claim 1 , ...

Method for producing a part from composite material by injecting a filled slip into a fibrous texture

A manufacturing method for a composite material part includes injecting under pressure a slip containing a refractory ceramic particle powder into the moulding cavity of an injection tooling, draining the liquid from the slip that passed through the moulding cavity and retaining the particle powder inside the moulding cavity to obtain a blank including refractory particles, demoulding the blank, and heat treating the blank to form a part. The injection tooling includes a porous material mould consisting of a moulding cavity, an enclosure of rigid material in which the porous material mould is held, the enclosure further including an injection port, a discharge vent and an injection canal connecting the injection port to the moulding cavity of the porous mould for the injection of the slip into the moulding cavity. The injection tooling includes a sacrificial capsule of porous material placed in moulding cavity.

Helium gas separator material and method for producing the same

The helium gas separator material includes a base portion and a gas separation portion joined to the base portion. The base portion is composed of a porous α-alumina material which has communication holes with an average diameter of 50 nm to 1,000 nm; the gas separation portion has a porous γ-alumina portion containing a Ni element and a silica membrane portion which is disposed on the inner wall of the communication holes in the porous portion; and the average diameter of pores surrounded and formed by the silica membrane portion is 0.27 nm to 0.60 nm.

THERMALLY INSULATING MATERIAL

Provided are thermally insulating materials comprising 1 to 95 wt % ceramic oxide, 1 to 30 wt % inorganic binding agent, and treated at a temperature of less than about 1000° C.; processes for producing the insulating materials; and uses thereof. 1. A thermally insulating material comprising:(a) 1 to 80 wt % ceramic oxide;(b) 5 to 30 wt % inorganic binding agent; and(c) treated at a temperature of less than 1000° C.;wherein the insulating material does not comprise vermiculite.2. The insulating material according to claim 1 , comprising 5 to 80 wt % ceramic oxide and 10 to 80 wt % ceramic oxide.3. (canceled)4. The insulating material according to claim 1 , wherein the ceramic oxide has a mean particle size of less than 350 μm or a mean particle size from 30 to 300 μm.5. (canceled)6. The insulating material according to claim 1 , wherein the ceramic oxide is selected from the group consisting of sodium oxide claim 1 , magnesium oxide claim 1 , potassium oxide claim 1 , calcium oxide claim 1 , alumina claim 1 , silica claim 1 , sodium silicate claim 1 , magnesium silicate claim 1 , potassium silicate claim 1 , calcium silicate claim 1 , aluminium silicate claim 1 , zirconium silicate claim 1 , sodium aluminate claim 1 , magnesium aluminate claim 1 , calcium aluminate claim 1 , zirconium aluminate claim 1 , nickel aluminate claim 1 , sodium phosphate claim 1 , magnesium phosphate claim 1 , calcium phosphate claim 1 , aluminium phosphate claim 1 , ferrous oxide claim 1 , ferric oxide claim 1 , zirconium oxide claim 1 , magnesium zirconate claim 1 , calcium zirconate claim 1 , and combinations thereof.7. The insulating material according to claim 1 , comprising 5 to 30 wt % inorganic binding agent.8. (canceled)9. The insulating material according to claim 1 , wherein the inorganic binding agent has a mean particle size of less than 350 μm or a mean particle size from 30 to 300 μm.10. (canceled)11. The insulating material according to claim 1 , wherein the inorganic ...

POROUS CERAMIC MATERIAL OBTAINED BY WEAVING AND ACOUSTIC PANEL INCLUDING SUCH A MATERIAL

The present disclosure concerns a porous body made of a ceramic-matrix composite material for an acoustic attenuation panel and a method of manufacturing the porous body. The porous body includes a plurality of interwoven ceramic fibers, a metal oxide matrix, and a plurality of channels interwoven with the ceramic fibers and interconnected together. The channels define at least one cavity. In one form, at least one channel is wrapped around a ceramic fiber. In another form, at least one ceramic fiber and at least one channel are twisted together. In yet another form, at least one channel is wrapped around a ceramic fiber and twisted with the ceramic fiber. The present disclosure also concerns an acoustic attenuation panel including the porous body and an aircraft propulsion unit having such a panel. 1. A porous body made of a ceramic-matrix composite material for an acoustic attenuation panel , the porous body comprising:a plurality of interwoven ceramic fibers;a metal oxide matrix; anda plurality of channels interwoven with said ceramic fibers, said plurality of channels being interconnected together and defining at least one cavity,wherein at least one channel is wrapped around a ceramic fiber and/or twisted together with at least one ceramic fiber.2. The porous body according to claim 1 , wherein the channels are orientated in at least one of a weft direction and a warp direction of the ceramic fibers.3. The porous body according to claim 1 , wherein at least one ceramic fiber has a titer between 50 grams/1000 meters and 2500 grams/1000 meters for densities between 2.2 and 4.4. The porous body according to claim 1 , wherein at least one channel has an ovoid section having a minor axis between 0.05 mm and 5 mm and a major axis between 0.05 mm and 10 mm.5. The porous body according to claim 1 , wherein a volume ratio of the plurality of channels of the porous body is between 2% and 95% of said body.6. The porous body according to claim 5 , wherein the volume ratio ...

ABRASIVE PARTICLES

The formed ceramic abrasive particle includes a plurality of ceramic oxides. The particle further includes a first plurality of oxides, a second plurality of oxides, or a mixture thereof. The first plurality of oxides includes an oxide of yttrium, praseodymium, samarium, ytterbium, neodymium, lanthanum, gadolinium, dysprosium, erbium, or a combination thereof. The second plurality of oxides includes an oxide of iron, magnesium, zinc, silicon, cobalt, nickel, zirconium, hafnium, chromium, cerium, titanium, or a combination thereof. The formed ceramic abrasive particle further includes a plurality of edges, each edge having a length independently ranging from about 0.1 μm to about 5000 μm. The formed ceramic abrasive particle further includes a tip defined by a junction of at least two of the edges, the tip can have a radius of curvature ranging from about 0.5 μm to about 80 μm. 1. A formed ceramic abrasive particle comprising:a plurality of ceramic oxides; the first plurality of oxides comprise an oxide of yttrium, praseodymium, samarium, ytterbium, neodymium, lanthanum, gadolinium, dysprosium, erbium, or a combination thereof, and', 'the second plurality of oxides comprise an oxide of iron, magnesium, zinc, silicon, cobalt, nickel, zirconium, hafnium, chromium, cerium, titanium, or a combination thereof;, 'a first plurality of oxides, a second plurality of oxides, or a mixture thereof, wherein'}a plurality of edges, each edge having a length independently ranging from about 0.1 μm to about 5000 μm; anda tip defined by a junction of at least two of the edges, the tip having a radius of curvature ranging from about 0.5 μm to about 80 μm.2. The formed ceramic abrasive particle of claim 1 , wherein the ceramic oxides independently comprise fused aluminium oxide material claim 1 , heat treated aluminium oxide material claim 1 , sintered aluminium oxide material claim 1 , silicon carbide material claim 1 , titanium diboride claim 1 , boron carbide claim 1 , tungsten ...

METHOD FOR MANUFACTURING WAVELENGTH CONVERSION MEMBER

A method for manufacturing a wavelength conversion member that offers a high emission intensity and a high light conversion efficiency is provided. The method for manufacturing a wavelength conversion member includes providing a green body containing an yttrium-aluminum-garnet phosphor with a composition represented by Formula (I) below and alumina particles with an alumina purity of 99.0% by mass or more, primary-sintering the green body to obtain a first sintered body, and secondary-sintering the first sintered body by applying a hot isostatic pressing (HIP) treatment to obtain a second sintered body. 1. A method for manufacturing a wavelength conversion member , the method comprising: an yttrium-aluminum-garnet phosphor having a composition represented by Formula (I) below; and', 'alumina particles with an alumina purity of 99.0% by mass or more;, 'providing by applying a cold isostatic pressing (CIP) treatment a green body comprisingprimary-sintering the green body at a temperature in a range of 1200° C. or more and 1800° C. or less to obtain a first sintered body; and {'br': None, 'sub': 1-a-b', 'a', 'b', '3', '5', '12, '(YGdCe)AlO\u2003\u2003(I)'}, 'secondary-sintering the first sintered body by applying a hot isostatic pressing (HIP) treatment to obtain a second sintered body,'}wherein a and b satisfy 0≤a≤0.3 and 0 Подробнее

Corrosion-resistant member

A corrosion-resistant member may include alumina ceramics containing α-alumina and anorthite. The alumina ceramics may contain 0.4% by mass or more of Ca and Si in total in terms of CaO and SiO 2 , respectively, and a mass ratio of CaO/SiO 2 may fall within a range of 0.5 to 2. Moreover, a ratio B/A of X-ray diffraction peak intensity B for (004) plane of the anorthite to X-ray diffraction peak intensity A for (104) plane of the α-alumina in a surface of the alumina ceramics, may be 0.01 or more.

MEMBER FOR PLASMA PROCESSING DEVICES

A member for a plasma processing device of the present disclosure is a member for a plasma processing device made of ceramics and having a shape of a cylindrical body with a through hole in an axial direction. The ceramics is mainly composed of aluminum oxide, and has a plurality of crystal grains and a grain boundary phase that is present between the crystal grains. An inner peripheral surface of the cylindrical body has an arithmetic average roughness Ra of 1 μm or more and 3 μm or less, and an arithmetic height Rmax of 30 μm or more and 130 μm or less. 1. A member for a plasma processing device made of ceramics and having a shape of a cylindrical body with a through hole in an axial direction ,wherein the ceramics is mainly composed of aluminum oxide, and has a plurality of crystal grains and a grain boundary phase that is present between the crystal grains, andwherein the cylindrical body has an inner peripheral surface having an arithmetic average roughness Ra of 1 μm or more and 3 μm or less, and an arithmetic height Rmax of 30 μm or more and 130 μm or less.2. The member for a plasma processing device according to claim 1 , wherein the inner peripheral surface of the cylindrical body has an average value of kurtosis Rku of 6.0 or more.3. The member for a plasma processing device according to claim 1 , wherein the inner peripheral surface of the cylindrical body has a projected part composed of aluminum oxide crystal grains claim 1 , and a surface of the projected part is composed of a plurality of planes. The present disclosure relates to a member for a plasma processing device used in a plasma processing device.Conventionally, when manufacturing a semiconductor device, a plasma processing device is used to form a fine pattern by etching a thin film on a substrate. A member for a plasma processing device that supplies plasma generating gas to the plasma processing device is required to have high corrosion resistance with respect to the plasma generating gas in ...

Acoustic attenuation panel made of an oxide ceramic composite material with a core made of an electrochemically-converted metal material

The present disclosure relates to a method for producing an acoustic attenuation panel having two outer skins made from a composite material with a ceramic matrix containing a fibrous reinforcement. The skins are assembled on each side of a central honeycomb core having walls forming acoustic cavities produced by at least partial electrochemical conversion of aluminum into aluminum oxide. The method includes inserting a fugitive filler material into the acoustic cavities, leaving an annular space free in each cavity, on each side against the skin, extending around the cavity, and a step of sintering the composite material, in which the fugitive material is removed and the spaces around the cavities are filled with the composite material.

METHOD OF MANUFACTURING ELECTRICALLY CONDUCTIVE MAYENITE COMPOUND WITH HIGH ELECTRON DENSITY

A method of manufacturing an electrically conductive mayenite compound, includes (a) preparing a body to be processed, the body to be processed including a mayenite compound or a precursor of a mayenite compound; and (b) performing a heat treatment on the body to be processed under a reducing atmosphere including an aluminum compound and carbon monoxide (CO) gas within a range of 1080° C. to 1450° C., the aluminum compound being a compound that emits aluminum oxide gas during the heat treatment on the body to be processed. 1. A method of manufacturing an electrically conductive mayenite compound , comprising:(a) preparing a body to be processed, the body to be processed including a mayenite compound or a precursor of a mayenite compound; and(b) performing a heat treatment on the body to be processed under a reducing atmosphere including an aluminum compound and carbon monoxide (CO) gas within a range of 1080° C. to 1450° C., the aluminum compound being a compound that emits aluminum oxide gas during the heat treatment on the body to be processed.2. The method of manufacturing an electrically conductive mayenite compound according to claim 1 ,{'sub': 4', '3, 'wherein the aluminum compound is aluminum carbide (AlC).'}3. The method of manufacturing an electrically conductive mayenite compound according to claim 1 ,wherein the body to be processed is selected from a group consisting of a compact body including a mayenite compound powder, a sintered body including a mayenite compound and a compact body including a calcinated powder including calcium and aluminum.4. The method of manufacturing an electrically conductive mayenite compound according to claim 1 ,wherein step (b) is performed within a range of 30 minutes to 50 hours.5. The method of manufacturing an electrically conductive mayenite compound according to claim 1 ,wherein step (b) is performed under a vacuum environment whose pressure is less than or equal to 100 Pa.6. The method of manufacturing an ...

METHOD OF MANUFACTURING ELECTRICALLY CONDUCTIVE MAYENITE COMPOUND WITH HIGH ELECTRON DENSITY

A method of manufacturing an electrically conductive mayenite compound, includes preparing a body to be processed including a mayenite compound; and placing the body to be processed in the presence of carbon monoxide gas and aluminum vapor supplied from an aluminum source without being in contact with the aluminum source and retaining the body to be processed at a temperature range of 1080° C. to 1450° C. under a reducing atmosphere. 1. A method of manufacturing an electrically conductive mayenite compound , comprising:(1) preparing a body to be processed including a mayenite compound; and(2) placing the body to be processed in the presence of carbon monoxide gas and aluminum vapor supplied from an aluminum source without being in contact with the aluminum source and retaining the body to be processed at a temperature range of 1080° C. to 1450° C. under a reducing atmosphere.2. The method of manufacturing an electrically conductive mayenite compound according to claim 1 ,wherein the body to be processed includes a fluorine (F) component.3. The method of manufacturing an electrically conductive mayenite compound according to claim 2 ,wherein step (2) is performed under a status that the body to be processed and the aluminum source are input in a container including carbon.4. The method of manufacturing an electrically conductive mayenite compound according to claim 2 ,wherein the body to be processed including the mayenite compound is a compact body including a mayenite compound powder including a fluorine (F) component, or a sintered body including a mayenite compound including a fluorine (F) component.5. The method of manufacturing an electrically conductive mayenite compound according to claim 2 ,wherein a mayenite compound in which fluorine ions are introduced is manufactured after step (2).6. The method of manufacturing an electrically conductive mayenite compound according to claim 2 ,wherein step (2) is performed at a vacuum atmosphere whose pressure is less ...

Sintered compact, circuit component, and method of producing sintered compact

A sintered compact includes an alumina phase as a primary phase, and further includes an amorphous phase containing Si and Mn and a cordierite phase. The sintered compact has a porosity of higher than or equal to 1.1% and less than or equal to 5.0%. Preferably, I1/(I1+I2) is greater than or equal to 0.20 and less than or equal to 0.45, where I1 is the strength of the main peak of cordierite obtained by an XRD method, and I2 is the strength of the main peak of alumina.

GARNET MATERIALS FOR LI SECONDARY BATTERIES AND METHODS OF MAKING AND USING GARNET MATERIALS

Set forth herein are garnet material compositions, e.g., lithium-stuffed garnets and lithium-stuffed garnets doped with alumina, which are suitable for use as electrolytes and catholytes in solid state battery applications. Also set forth herein are lithium-stuffed garnet thin films having fine grains therein. Disclosed herein are novel and inventive methods of making and using lithium-stuffed garnets as catholytes, electrolytes and/or anolytes for all solid state lithium rechargeable batteries. Also disclosed herein are novel electrochemical devices which incorporate these garnet catholytes, electrolytes and/or anolytes. Also set forth herein are methods for preparing novel structures, including dense thin (<50 um) free standing membranes of an ionically conducting material for use as a catholyte, electrolyte, and, or, anolyte, in an electrochemical device, a battery component (positive or negative electrode materials), or a complete solid state electrochemical energy storage device. Also, the methods set forth herein disclose novel sintering techniques, e.g., for heating and/or field assisted (FAST) sintering, for solid state energy storage devices and the components thereof. 1123-. (canceled)124. A composition comprising a lithium stuffed garnet and AlO , wherein the lithium-stuffed garnet is characterized by the empirical formula LiLaM′M″ZrO , wherein 4 Подробнее

Nickel-coated hexagonal boron nitride nanosheet composite powder, preparation and high performance composite ceramic cutting tool material

The invention relates to nickel-coated hexagonal boron nitride nanosheet composite powder, its preparation and high-performance composite ceramic cutting tool material. The composite powder has a core-shell structure with BNNS as the core and Ni as the shell. The self-lubricating ceramic cutting tool material is prepared by wet ball milling mixing and vacuum hot-pressing sintering with a phase alumina as the matrix, tungsten-titanium carbide as the reinforcing phase, nickel-coated hexagonal boron nitride nanosheet composite powder as the solid lubricant and magnesium oxide and yttrium oxide as the sintering aids. The invention also provides preparation methods of the nickel-coated hexagonal boron nitride nanosheet composite powder and the self-lubricating ceramic cutting tool material. 1. A nickel-coated hexagonal boron nitride nanosheet composite powder (BNNS@Ni) , wherein the composite powder has a core-shell structure with BNNS as the core and Ni as the shell.2. The nickel-coated hexagonal boron nitride nanosheet composite powder (BNNS@Ni) as claimed in claim 1 , wherein the Ni particles in the nickel-coated hexagonal boron nitride nanosheet composite powder are uniform in size claim 1 , and uniformly coated on the surface of the BNNS.3. The nickel-coated hexagonal boron nitride nanosheet composite powder (BNNS@Ni) as claimed in claim 1 , wherein the average sheet diameter of BNNS in the nickel-coated hexagonal boron nitride nanosheet composite powder is 100-800 nm claim 1 , and the average sheet thickness is 1-7 nm.4. The preparation method of the nickel-coated hexagonal boron nitride nanosheet composite powder (BNNS@Ni) as claimed in claim 1 , comprises the following steps:(1) the BNNS powder is proportionally weighed, added into an appropriate amount of isopropanol, ultrasonically dispersed for 20-30 min, and then centrifugally separate to obtain the dispersed BNNS powder;(2) the dispersed BNNS powder obtained in step (1) is added into the sensitizing solution ...

METHOD OF MAKING WHISKER REINFORCED HIGH FRACTURE TOUGHNESS CERAMIC THREADED FASTENERS

A high temperature fastener including a bolt and a nut, where the bolt and the nut are constructed of an aluminum oxide ceramic material reinforced with silicon-carbide crystal whiskers or silicon nitride. 117-. (canceled)18. A method of making a fastener comprising:creating a mixture of ceramic material powder;simultaneously heating and pressurizing the mixture creating a solid blank; and,forming a screw threaded surface on the blank.19. The method of claim 18 , further comprising:creating the mixture of ceramic material powder from aluminum oxide ceramic material powder and silicon-carbide crystal whiskers disbursed in the aluminum oxide ceramic material powder.20. (canceled)21. The method of claim 19 , further comprising:forming the screw threaded surface on the blank by machining the blank to form a screw threaded exterior surface on the blank.23. The method of claim 22 , further comprising:removing at least a portion of the insert from inside the blank creating a tool interface interior surface inside a blank.24. The method of claim 22 , further comprising:removing at least a portion of the insert from inside the blank creating a cooling channel inside the blank.25. The method of claim 22 , further comprising:removing at least a portion of the insert from inside the blank creating a screw threaded interior surface inside the blank.26. The method of claim 19 , further comprising:creating a mixture of aluminum oxide ceramic material powder and silicon-carbide crystal whiskers with a percentage of silicon-carbide crystal whiskers in the mixture being in a range of 18% to 30% of the mixture.27. The method of claim 19 , further comprising:the fastener having a low cataycity and high emissivity.28. A method of making a fastener comprisingcreating a mixture of aluminum oxide ceramic material powder and silicon-carbide whiskers;hot pressing the mixture of aluminum oxide ceramic material powder and silicon-carbide whiskers at a high temperature and a high pressure ...

PLATE-LIKE ALUMINA PARTICLE AND A MANUFACTURING METHOD FOR THE SAME

An object of the present invention is to provide a high-aspect-ratio plate-like alumina particle having low aggregability and high dispersibility and a method for producing the particle. The above problem is solved by providing a plate-like alumina particle including a step of firing an aluminum compound in the presence of a shape-controlling agent and a molybdenum compound serving as a fluxing agent. The above problem is solved also by providing a method for producing a plate-like alumina particle, the method including a step in which the aluminum compound and the molybdenum compound react with each other to form aluminum molybdate and a step in which the aluminum molybdate is decomposed to obtain the plate-like alumina particle. 1. A plate-like alumina particle that is obtained by firing an aluminum compound in the presence of a molybdenum compound and a shape-controlling agent and that includes molybdenum in the particle.2. The plate-like alumina particle according to claim 1 , wherein the shape-controlling agent is a compound including silicon or a silicon atom.3. The plate-like alumina particle according to claim 1 , wherein the shape-controlling agent is a compound including sodium or a sodium atom.4. The plate-like alumina particle according to claim 1 , having a polygonal plate-like particle shape and an aspect ratio claim 1 , which is a ratio of particle size to thickness claim 1 , of 2 to 500.5. The plate-like alumina particle according to claim 1 , wherein a molybdenum content is 0.001% to 10% by mass on a molybdenum trioxide basis.6. A method for producing a plate-like alumina particle that is obtained by firing an aluminum compound in the presence of a molybdenum compound and a shape-controlling agent and that includes molybdenum in the particle.7. The method for producing a plate-like alumina particle according to claim 6 , further comprising:a step in which the aluminum compound and the molybdenum compound react with each other to form aluminum ...

METHOD OF MANUFACTURING REFRACTORY

In a firing condition determination step S, as firing conditions for firing a refractory, an FeOamount (mass %) which is an FeOcontent, a target firing temperature T (° C.) to which the temperature of the refractory is raised when the refractory is fired and a continuous firing time t (hr) during which the firing is continued at the target firing temperature T are determined. The FeOamount, the target firing temperature T and the continuous firing time t are determined so as to satisfy all five formulas of 1.20.992×FeOamount+0.080. 1. A method of manufacturing an AlO—SiO-based refractory in which an AlOcontent is equal to or more than 35% and equal to or less than 80% by mass % , the method comprising:{'sub': 2', '3', '2', '2', '3', '2', '3, 'a firing condition determination step of determining, as firing conditions for firing the AlO—SiO-based refractory, an FeOamount (mass %) which is an FeOcontent in the refractory, a target firing temperature T (° C.) serving as a target temperature to which a temperature of the refractory is raised when the refractory is fired and a continuous firing time t (hr) serving as a time during which the firing of the refractory is continued at the target firing temperature T after the temperature of the refractory is raised to the target firing temperature T;'}{'sub': 2', '3', '2', '3, 'a temperature rise firing step of using the refractory which contains the FeOamount of FeOdetermined in the firing condition determination step and firing the refractory while raising the temperature of the refractory to the target firing temperature T; and'}a continuous firing step of firing the refractory whose temperature is raised to the target firing temperature T at the target firing temperature T for the continuous firing time t,{'sub': 2', '3, 'claim-text': [{'br': None, 'sub': 2', '3, '1.2 Подробнее

Light wavelength conversion member and light emission device

An optical wavelength conversion member including a polycrystalline ceramic sintered body containing, as main components, Al2O3 crystal grains and crystal grains of a component represented by formula A3B5O12:Ce, wherein A is at least one element selected from Sc, Y and lanthanoids (except for Ce), and B is at least one element selected from Al and Ga. Further, the following relations are satisfied: 0%≤X≤25%, 9%≤Y≤45%, and 48%≤Z≤90%, wherein X represents a proportion corresponding to the ratio a/N, Y represents a proportion corresponding to the ratio b/N, and Z represents a proportion corresponding to the ratio c/N and a, b, c and N are as defined herein. Also disclosed is a light-emitting device including the optical wavelength conversion member.

CERAMIC FILTER FOR BEVERAGE AND MANUFACTURING METHOD OF THE SAME

A ceramic filter requires a permeation time ranging from 3 seconds to 15 seconds in a case where 150 ml of hot water having a temperature of 90° C. is introduced, has a total pore volume of 0.230 to 0.270 cm/g, and has a median pore diameter of 100 to 160 μm. A method for manufacturing the ceramic filter includes a kneading process of obtaining a kneaded material in which 55 to 65 mass % of alumina, 6 to 12 mass % of bentonite, 6 to 10 mass % of water-insoluble organic fine particles, and 15 to 30 mass % of water are mixed, a primary molding process of molding a primary molded article by manually pressing the kneaded material against a filter mold, a secondary molding process of molding a secondary molded article by performing press working on the primary molded article molded in the primary molding process, and a firing process of firing the secondary molded article molded in the secondary molding process. 1. A ceramic filter for a beverage , the ceramic filter requiring a permeation time ranging from 3 seconds to 15 seconds in a case where 150 ml of hot water having a temperature of 90° C. is introduced , having a total pore volume of 0.230 to 0.270 cm/g , and having a median pore diameter of 100 to 160 μm.2. The ceramic filter for a beverage according to claim 1 , wherein the ceramic filter is formed in a bowl shape.3. A method for manufacturing the ceramic filter for a beverage according to claim 1 , comprising:a kneading process of obtaining a kneaded material in which 55 to 65 mass % of alumina, 6 to 12 mass % of bentonite, 6 to 10 mass % of water-insoluble organic fine particles, and 15 to 30 mass % of water are mixed;a primary molding process of molding a primary molded article by manually pressing the kneaded material against a filter mold;a secondary molding process of molding a secondary molded article by performing press working on the primary molded article molded in the primary molding process; anda firing process of firing the secondary molded article ...

Light weight proppant with improved strength and methods of making same

Methods are described to make strong, tough, and/or lightweight glass-ceramic composites having a crystalline phase and an amorphous phase generated by viscous reaction sintering of a complex mixture of oxides and other materials. The present invention further relates to strong, tough, and lightweight glass-ceramic composites that can be used as proppants and for other uses.

GARNET MATERIALS FOR LI SECONDARY BATTERIES AND METHODS OF MAKING AND USING GARNET MATERIALS

Set forth herein are garnet material compositions, e.g., lithium-stuffed garnets and lithium-stuffed garnets doped with alumina, which are suitable for use as electrolytes and catholytes in solid state battery applications. Also set forth herein are lithium-stuffed garnet thin films having fine grains therein. Disclosed herein are novel and inventive methods of making and using lithium-stuffed garnets as catholytes, electrolytes and/or anolytes for all solid state lithium rechargeable batteries. Also disclosed herein are novel electrochemical devices which incorporate these garnet catholytes, electrolytes and/or anolytes. Also set forth herein are methods for preparing novel structures, including dense thin (<50 um) free standing membranes of an ionically conducting material for use as a catholyte, electrolyte, and, or, anolyte, in an electrochemical device, a battery component (positive or negative electrode materials), or a complete solid state electrochemical energy storage device. Also, the methods set forth herein disclose novel sintering techniques, e.g., for heating and/or field assisted (FAST) sintering, for solid state energy storage devices and the components thereof. 1. A composition comprising a lithium stuffed garnet and AlO , wherein the lithium-stuffed garnet is characterized by the empirical formula{'br': None, 'sub': A', 'B', 'D', 'E', 'F, 'i': 'c', 'LiLaM′M″ZrO,'}wherein 4 Подробнее

POROUS MATERIAL INCLUDING CARBON NANOHORNS AND USE THEREOF

The objective of the present teaching is to provide a porous material including carbon nanohorns. The porous material includes carbon nanohorns and has a predetermined three-dimensional shape. 1. A method for producing a sintered and porous body containing carbon nanohorns ,the method comprising:preparing a molding body containing a carbon nanohorn produced by arc discharge in a fluid; andheating the molding body under pressure to sinter and make porous the molding body.2. The method according to claim 1 , wherein the heating is performed by discharge plasma sintering.3. The method according to claim 1 , wherein the heating is performed at a temperature of 800° C. or more.4. The method according to claim 1 , wherein the heating is perfoimed by applying a load of 10 kN or less.5. The method according to claim 1 , wherein the heating is performed under vacuum condition.6. The method according to claim 1 , wherein the heating is performed at a temperature of 800° C. or more by applying a load of 10 kN or less.7. The method according to claim 1 , wherein the density of the sintered and porous body is 2.5 cm/g or less.8. The method according to claim 1 , wherein the pore volume of the carbon nanohorrn is 0.8 cm/g or more.9. The method according to claim 8 , wherein the heating is performed at a temperature of 800° C. or more by applying a load of 10 kN or less.10. The method according to claim 1 , wherein the carbon nanohorn relates to one or more elements selected from the group consisting of Na claim 1 , K claim 1 , Mg claim 1 , Ca claim 1 , Fe claim 1 , Si claim 1 , and Cl and contains the one or more elements in the following contents;Na: 0.003% or more to 0.3% or less;K: 0.001% or more to 0.1% or less;Mg: 0.0005% or more to 0.05% or less;Ca: 0.004% or more to 0.4% or less;Fe: 0.006% or more to 0.6% or less;Si: 0.002% or more to 0.2% or less; andO: 0.004% or more to 0.4% or less.11. The method according to claim 1 , wherein the carbon nanohorn is composed mainly of a ...

Dense sintered product

Sintered product having a chemical analysis such that, in mass percentages: SiO 2 content is greater than 0.2% and less than 2%, and CaO content is greater than 0.1% and less than 1.5%, and MgO content is less than 0.3%, and alumina and other elements being the complement at 100%, the content of other elements being less than 1.5%, having a relative density greater than 90%, comprising, for more than 90% of its volume, a stack of ceramic platelets ( 10 ) laid flat, all of said platelets having an average thickness less than 3 μm, more than 95% by number of said platelets each containing more than 95% by mass of alumina, having a width (l) greater than 81 mm.

Method for manufacturing an elastic ceramic matrix composite

Disclosed are: damage-resistant ECMCs that need to work and remain elastic between minus 120° C. and positive 300° C.; ECMCs that need to be able to contain a flame of 1900° C. for more than 90 minutes; and composite structures, especially highly stressed structures. One of the characteristic problems of ceramic matrices is their fragility. Indeed, when a fracture starts, it propagates easily in the matrix. Disclosed are elastic ceramic matrix composites (ECMCs), for which: the ceramic matrix is split into solid “ceramic microdomains” (CMDs); the CMDs are connected to one another by a dense network of “elastic microelements” (EMEs); and the bonds between the EMEs and the CMDs are strong chemical bonds, preferably covalent.

Optical wavelength conversion member and light-emitting device

One aspect of the disclosure provides an optical wavelength conversion member including a polycrystalline ceramic sintered body containing, as main components, Al2O3 crystal grains and crystal grains represented by formula (Y,A)3B5O12:Ce. In the optical wavelength conversion member, a (Y,A)3B5O12:Ce crystal grain has a region wherein the A concentration of a peripheral portion of the (Y,A)3B5O12:Ce crystal grain is higher than that of an interior portion of the (Y,A)3B5O12:Ce crystal grain. Thus, the optical wavelength conversion member exhibits high fluorescence intensity (i.e., high emission intensity) and high heat resistance (i.e., low likelihood of temperature quenching). The optical wavelength conversion member has a structure wherein the element A concentration of a peripheral portion of a (Y,A)3B5O12:Ce crystal grain differs from that in an interior portion of the crystal grain. This structure can achieve a ceramic fluorescent body exhibiting superior fluorescent characteristics and superior thermal characteristics with varied colors of emitted light.

Alumina sintered body and method for producing same

Provided is an alumina sintered body which has a high heat conductivity and a high infrared ray emissivity and is excellent in electrical insulation property and chemical resistance. An alumina sintered body contains cubic aluminum nitride.

COMPOSITE SINTERED BODY, ELECTROSTATIC CHUCK MEMBER, AND ELECTROSTATIC CHUCK DEVICE

A composite sintered body, wherein the composite sintered body consists of ceramic composite sintered body, the ceramic composite sintered body comprises aluminum oxide as a main phase, and silicon carbide as a sub-phase, in which the composite sintered body has mullite in crystal grains of the aluminum oxide. 1. A composite sintered body , whereinthe composite sintered body consists of a ceramic composite sintered body,the ceramic composite sintered body comprisesaluminum oxide as a main phase, andsilicon carbide as a sub-phase,wherein the composite sintered body has mullite in crystal grains of the aluminum oxide.2. The composite sintered body according to claim 1 ,wherein the composite sintered body does not have mullite at crystal grain boundaries of the aluminum oxide.3. The composite sintered body according to claim 1 ,wherein when crystal grains are defined such thatcrystal grains of the aluminum oxide are defined as first crystal grains,crystal grains which are dispersed in the crystal grains of the first crystal grains and contain the mullite are defined as second crystal grains, andcrystal grains of the silicon carbide which are present at crystal grain boundaries of the first crystal grains are defined as third crystal grains,an average crystal grain size of the first crystal grains is 0.5 μm or more and 10 μm or less, andan average crystal grain size of the second crystal grains is smaller than an average crystal grain size of the third crystal grains.4. The composite sintered body according to claim 1 ,wherein when crystal grains are defined such thatthe crystal grains of the aluminum oxide are defined as first crystal grains,crystal grains which are dispersed in the crystal grains of the first crystal grains and contain the mullite are defined as second crystal grains, andcrystal grains of the silicon carbide which are present at crystal grain boundaries of the first crystal grains are defined as third crystal grains,a ratio of a total of the second ...

COMPOSITE CERAMIC POWDER, SEALING MATERIAL, AND COMPOSITE CERAMIC POWDER PRODUCTION METHOD

A composite ceramic powder of the present invention includes: a LAS-based ceramic powder having precipitated therein β-eucryptite or a β-quartz solid solution as a main crystal; and TiOpowder and/or ZrOpowder,. 1. A composite ceramic powder , comprising: a LAS-based ceramic powder having precipitated therein β-eucryptite or a β-quartz solid solution as a main crystal; and TiOpowder and/or ZrOpowder.2. The composite ceramic powder according to claim 1 , wherein the LAS-based ceramic powder comprises as a composition claim 1 , in terms of mol % claim 1 , 10% to 35% of LiO claim 1 , 10% to 35% of AlO claim 1 , and 30% to 80% of SiO.4. The composite ceramic powder according to claim 1 , wherein a content of the TiOpowder and the ZrOpowder in terms of a total content is from 0.05 mass % to 10 mass %.3. The composite ceramic powder according to claim 1 , wherein the composite ceramic powder is substantially free of a glass phase.5. A sealing material claim 1 , comprising a glass powder and a ceramic powder claim 1 ,{'sub': 2', '2, 'wherein the ceramic powder comprises: a LAS-based ceramic powder having precipitated therein β-eucryptite or a β-quartz solid solution as a main crystal; and TiOpowder and/or ZrOpowder.'}6. A method of producing a composite ceramic powder claim 1 , comprising the steps of:firing a raw material batch to obtain, through a solid phase reaction, a sintered body having precipitated therein β-eucryptite or a β-quartz solid solution as a main crystal;pulverizing the sintered body to obtain a LAS-based ceramic powder; and{'sub': 2', '2, 'mixing the obtained LAS-based ceramic powder and TiOpowder and/or ZrOpowder to obtain a composite ceramic powder.'}7. The method of producing a composite ceramic powder according to claim 6 , comprising using a pulverized product of a pre-sintered body containing Li claim 6 , Al claim 6 , and Si as a whole or part of introduction raw materials for Li claim 6 , Al claim 6 , and Si of the LAS-based ceramic powder.8. The ...

Wavelength coverting member

Provided is a wavelength converting member made of a sintered body which inhibits color unevenness of exit light after wavelength conversion and has excellent light emitting efficiency and inhibited decrease in mechanical strength. The wavelength converting member includes a plate-like sintered body having one principal surface as a light entrance surface and the other principal surface opposite to the entrance surface as a light exit surface, in which the plate-like sintered body has a porosity of 0.1% or less which has fluorescent material grains containing an activator and light-transmitting material grains, the entrance surface and the exit surface are a sintered surface in which the fluorescent material grains and light-transmitting material grains are exposed without processing.

CERAMIC SINTERED BODY

The durability of a ceramic sintered body is improved, and a reduction in its light emission intensity and the occurrence of a chromaticity variation are suppressed. The ceramic sintered body contains alumina and a compound represented by M1M2M3O. The volume percent of the compound in the ceramic sintered body is from 3% to 70% inclusive. The ratio of the intensity of XRD from a complex oxide of aluminum and M2 to the intensity of XRD from the compound in the ceramic sintered body is less than 0.05. The average grain diameter of the alumina contained in the ceramic sintered body is from 0.30 (μm) to 3.00 (μm) inclusive. M1 is at least one selected from Sc, Y, and lanthanoid elements, and M2 is at least one selected from lanthanoid elements except any lanthanoid element selected for M1. M3 is at least one of Al and Ga, and X is from 0.003 to 0.500 inclusive. 1. A ceramic sintered body characterized by comprising:{'sub': 2', '3, 'alumina (AlO); and'}{'sub': 3-X', 'X', '5', '12, 'a compound represented by M1M2M3O, wherein'}the volume percent of the compound in the ceramic sintered body is from 3% to 70% inclusive;the ratio of the intensity of X-ray diffraction from a complex oxide of aluminum (Al) and the M2 to the intensity of X-ray diffraction from the compound in the ceramic sintered body is less than 0.05;{'sub': 2', '3, 'the average grain diameter of the alumina (AlO) contained in the ceramic sintered body is from 0.30 (μm) to 3.00 (μm) inclusive;'}the M1 is at least one selected from scandium (Sc), yttrium (Y), and lanthanoid elements;the M2 is at least one selected from lanthanoid elements except any lanthanoid element selected for the M1;the M3 is at least one of aluminum (Al) and gallium (Ga); andthe X is from 0.003 to 0.500 inclusive.2. A ceramic sintered body according to claim 1 , whereinthe M1 is at least one selected from scandium (Sc), yttrium (Y), gadolinium (Gd), terbium (Tb), erbium (Er), ytterbium (Yb), and lutetium (Lu); andthe M2 is at least one ...

DOUBLE-SHELL PHASE CHANGE HEAT STORAGE BALLS AND PREPARATION METHOD THEREOF

A double-shell phase change heat storage balls and preparation method thereof is disclosed. The technical scheme is as follows. Paraffin is placed in oven, and organic ignition loss is added to obtain paraffin melt containing the ignition loss; metal balls is immersed in the paraffin melt containing the ignition loss, and cooled naturally to obtain the metal balls coated by ignition loss and paraffin; alumina refractory slurry is placed in a pan granulator, and the metal balls coated by ignition loss and paraffin is added, pelletized, and dried to obtain alumina composite phase change heat storage ball bodies; mullite refractory slurry is placed in a pan granulator, alumina composite phase change heat storage ball bodies is added, pelletized, dried, and placed in a muffle furnace. The temperature is raised to 1200-1600° C. by three systems and maintained. After naturally cooling, the double-shell phase change heat storage balls are prepared. 1. A preparation method for a double-shell phase change heat storage balls , comprising:Step 1: preparing raw materials with 50-70 wt % of a paraffin and 30-50 wt % of an organic ignition loss, placing the paraffin in an oven at 80-110° C. for 1-2 h to obtain a paraffin melt; then adding the organic ignition loss to produce a paraffin melt containing the ignition loss; then immersing metal balls in the paraffin melt containing the ignition loss for 10-20 s, and naturally cooling the immersed metal balls in a fume hood to prepare metal balls coated by ignition loss and paraffin;Step 2: placing 15-35 wt % of an alumina refractory slurry in a pan granulator, then adding 65-85 wt % of the metal balls coated by ignition loss and paraffin into the pan granulator, rotating the pan granulator at 10-20 r/min for 0.5-1 h, taking out and placing the pelletized metal balls in a fume hood for 4-6 h, and then maintaining a temperature at 80-110° C. for 20-24 h to prepare alumina composite phase change heat storage ball bodies;Step 3: placing ...

METHOD OF FORMING GRAPHENE/METAL-OXIDE HYBRID REINFORCED COMPOSITES AND PRODUCT THEREOF

A graphene/metal-oxide hybrid reinforced composite and a method for a graphene/metal-oxide hybrid reinforced composite. The method includes freeze drying a slurry comprising graphene oxide and flakes to form a flake-graphene oxide foam. The graphene/metal-oxide hybrid reinforced composite comprises graphene, metal, and metal oxide nanoparticles. The metal is arranged in parallel lamellar structure to form metal layers in the composite. The metal oxide nanoparticles are present at the interfaces between the metal layers and the graphene. 1. A process for forming a graphene/metal-oxide hybrid reinforced composite , comprising:freeze drying a slurry comprising graphene oxide and flakes to form a flake-graphene oxide foam.2. The process for forming a graphene/metal-oxide hybrid reinforced composite according to claim 1 , further comprisingcompressing the flake-graphene oxide foam to form a flake-graphene oxide dense foam;annealing the flake-graphene oxide dense foam to form a flake-graphene dense foam;sintering the flake-graphene dense foam to form a bulk graphene/metal-oxide hybrid reinforced composite; andcold rolling the bulk graphene/metal-oxide hybrid reinforced composite to form the graphene/metal-oxide hybrid reinforced composite.3. The process for forming a graphene/metal-oxide hybrid reinforced composite according to claim 1 , wherein the flakes are metal flakes.4. The process for forming a graphene/metal-oxide hybrid reinforced composite according to claim 1 , wherein the flakes are ceramic flakes.5. (canceled)6. (canceled)7. The process for forming a graphene/metal-oxide hybrid reinforced composite according to claim 1 , wherein the flakes are coated with a layer of polymer.8. (canceled)9. (canceled)10. The process for forming a graphene/metal-oxide hybrid reinforced composite according to claim 1 , wherein the slurry comprising graphene oxide and flakes is formed by a method comprising:forming a suspension comprising graphene oxide; andmixing the suspension ...

METHOD FOR MANUFACTURING WAVELENGTH CONVERSION MEMBER

A method for manufacturing a wavelength conversion member that offers a high emission intensity and a high light conversion efficiency is provided. The method for manufacturing a wavelength conversion member includes providing a green body containing an yttrium-aluminum-garnet phosphor with a composition represented by Formula (I) below and alumina particles with an alumina purity of 99.0% by mass or more, primary-sintering the green body to obtain a first sintered body, and secondary-sintering the first sintered body by applying a hot isostatic pressing (HIP) treatment to obtain a second sintered body. 1. A method for manufacturing a wavelength conversion member , the method comprising: an yttrium-aluminum-garnet phosphor with a composition represented by Formula (I) below; and', 'alumina particles with an alumina purity of 99.0% by mass or more;, 'providing a green body comprisingprimary-sintering the green body to obtain a first sintered body; and {'br': None, 'sub': 1-a-b', 'a', 'b', '3', '5', '12, '(YGdCe)AlO\u2003\u2003(I)'}, 'secondary-sintering the first sintered body by applying a hot isostatic pressing (HIP) treatment to obtain a second sintered body'}wherein a and b satisfy 0≤a≤0.3 and 0 Подробнее

CERAMIC COMPOSITION, CUTTING TOOL, AND TOOL FOR FRICTION STIR WELDING

An object of the present disclosure is to improve the properties of a ceramic composition. A ceramic composition contains alumina (AlO) and tungsten carbide (WC) and is characterized in that an atomic layer formed of at least one element selected from among transition metals belonging to Groups 4 to 6 of the periodic table, yttrium (Y), scandium (Sc), and lanthanoids is present at a crystal grain boundary between an alumina (AlO) crystal grain and a tungsten carbide (WC) crystal grain. 1. A ceramic composition comprising alumina (AlO) and tungsten carbide (WC) , the ceramic composition being characterized in that:{'sub': 2', '3, 'an atomic layer formed of at least one element selected from among transition metals belonging to Groups 4 to 6 of the periodic table, yttrium (Y), scandium (Sc), and lanthanoids is present at the crystal grain boundary between an alumina (AlO) crystal grain and a tungsten carbide (WC) crystal grain.'}2. A ceramic composition according to claim 1 , wherein the atomic layer is formed at the crystal grain boundary to follow the periodic arrangement of alumina (AlO) crystal grains or tungsten carbide (WC) crystal grains.3. A ceramic composition according to claim 1 , wherein the atomic layer is formed at the crystal grain boundary to follow the periodic arrangement of (100) plane of tungsten carbide (WC) crystal grains.4. A ceramic composition according to claim 1 , wherein the atomic layer is formed at the crystal grain boundary so as to have a thickness corresponding to one unit of (100) plane of tungsten carbide (WC) crystal grains.5. A ceramic composition according to claim 1 , wherein the atomic layer contains zirconium (Zr) as said at least one element.6. A ceramic composition according to claim 1 , wherein the atomic layer contains claim 1 , as said at least one element claim 1 , at least one element selected from among transition metals belonging to Groups 4 to 6 of the periodic table claim 1 , but excluding zirconium (Zr) claim 1 , ...

Alumina sintered body, method for manufacturing the same, and part for semiconductor manufacturing apparatus

An alumina sintered body comprising 0.01 to 1.0 mass % of one or more types selected from Ta, Nb, and V in terms of oxide thereof. The alumina sintered body may further comprise 0.01 to 1.0 mass % of Mg in terms of Mg oxide. It is particularly preferable that the alumina sintered body has an alumina purity of 99% or more. An alumina sintered body having low dielectric loss as compared with that in related art can therefore be produced at low cost.

DIAMOND COMPOSITES BY LITHOGRAPHY-BASED MANUFACTURING

A lithography based method for the manufacture of diamond composite materials in which green bodies are prepared by a layer-by-layer construction with resulting green bodies de-bound and sintered to achieve a dense high hardness material. 1. A method of preparing a diamond composite with a layered structure comprising:preparing a slurry containing a polymerisable binder, an initiator and diamond particles;forming a layered structure green body by stepwise irradiation curing of the slurry containing diamond particles, binder and initiator;forming a white body comprising at least 30 vol % diamond particles by de-binding the layered structure green body;introducing an infiltrant to the white body; andsintering the white body by heating the white body from an initial stage up to a maximum sintering temperature by incremental temperature increases at a rate of 10 to 60° C./min at a first pressure.2. The method as claimed in claim 1 , wherein the diamond particles have a particle size of less than or equal to 200 μm.3. The method as claimed in claim 1 , wherein the diamond particles have a particle size of less than or equal to 100 μm.4. The method as claimed in claim 1 , wherein the diamond particles have a bi-modular or multi-modular particle size distribution and at least one fraction of diamond particles has a particle size of less than 30 μm and at least one fraction of diamond particles has a particle size of less than 100 μm.5. The method as claimed in claim 1 , wherein the step of de-binding includes heating the green body up to a first de-binding temperature via incremental temperature increases claim 1 , wherein the de-binding temperature is in a range of from 200° C. to 600° C. and the incremental temperature increases are at increments of 0.1 to 2° C./min6. The method as claimed in claim 1 , wherein the step of de-binding includes exposing the green body to a supercritical fluid.7. The method as claimed in claim 1 , further comprising continuing to heat the ...

METHOD FOR PRODUCING LIGHT WAVELENGTH CONVERSION MEMBER, LIGHT WAVELENGTH CONVERSION MEMBER, LIGHT WAVELENGTH CONVERSION COMPONENT AND LIGHT EMITTING DEVICE

A method for producing an optical wavelength conversion member () composed of a sintered body containing, as main components, AlOand a component represented by formula ABO:Ce; an optical wavelength conversion member; an optical wavelength conversion component including the optical wavelength conversion member; and a light-emitting device including the optical wavelength conversion member or the optical wavelength conversion component. The production method of the sintered body includes firing in a firing atmosphere having a pressure of 10Pa or more and an oxygen concentration of 0.8 vol. % or more and less than 25 vol. %. 1. A method for producing an optical wavelength conversion member comprising a sintered body containing , as main components , AlOand a component represented by formula ABO:Ce (wherein A and B are elements) , the method being characterized by comprising:{'sup': '4', 'producing the sintered body through firing in a firing atmosphere having a pressure of 10Pa or more and an oxygen concentration of 0.8 vol. % or more and less than 25 vol. %.'}2. A method for producing an optical wavelength conversion member according to claim 1 , wherein the sintered body has an ABO:Ce content of 3 to 70 vol. % claim 1 , and the ABO:Ce is composed of polycrystalline grains formed through eutectic segregation in AlOduring the firing.3. A method for producing an optical wavelength conversion member according to claim 1 , wherein the sintered body has a garnet structure represented by ABO:Ce claim 1 , wherein each of A and B is at least one element selected from the following element groups:A: Sc, Y, and lanthanoids (except for Ce), andB: Al and Ga.4. A method for producing an optical wavelength conversion member according to claim 1 , wherein the Ce content of the ABO:Ce is 5 mol % or less (exclusive of 0) relative to the element A.5. An optical wavelength conversion member comprising a sintered body containing claim 1 , as main components claim 1 , AlOand a component ...

GARNET MATERIALS FOR LI SECONDARY BATTERIES AND METHODS OF MAKING AND USING GARNET MATERIALS

Set forth herein are garnet material compositions, e.g., lithium-stuffed garnets and lithium-stuffed garnets doped with alumina, which are suitable for use as electrolytes and catholytes in solid state battery applications. Also set forth herein are lithium-stuffed garnet thin films having fine grains therein. Disclosed herein are novel and inventive methods of making and using lithium-stuffed garnets as catholytes, electrolytes and/or anolytes for all solid state lithium rechargeable batteries. Also disclosed herein are novel electrochemical devices which incorporate these garnet catholytes, electrolytes and/or anolytes. Also set forth herein are methods for preparing novel structures, including dense thin (<50 um) free standing membranes of an ionically conducting material for use as a catholyte, electrolyte, and, or, anolyte, in an electrochemical device, a battery component (positive or negative electrode materials), or a complete solid state electrochemical energy storage device. Also, the methods set forth herein disclose novel sintering techniques, e.g., for heating and/or field assisted (FAST) sintering, for solid state energy storage devices and the components thereof. 1123-. (canceled)124. A thin and free standing sintered garnet polycrystalline film , wherein the film thickness is less than 100 μm and greater than 10 nm , wherein the film has grains having a dgrain size less than 10 μm , and wherein the film is not adhered or fixed to a substrate , and wherein the film is at least 1 cm in length.125. The thin and free standing sintered garnet crystalline film of claim 124 , wherein the film is at least 10 cm in length.126. The thin and free standing sintered garnet crystalline film of claim 124 , wherein the form factor of the thin and free standing sintered garnet crystalline film has a top surface area of 10 cm.127. The thin and free standing sintered garnet crystalline film of claim 124 , wherein the film thickness is less than 50 μm and greater than ...

METHOD OF FORMING HIGH THERMAL CONDUCTIVITY COMPOSITE DIELECTRIC MATERIALS

Disclosed herein are embodiments of materials having high thermal conductivity along with a high dielectric constants. In some embodiments, a two phase composite ceramic material can be formed having a contiguous aluminum oxide phase with a secondary phase embedded within the continuous phase. Example secondary phases include calcium titanate, strontium titanate, or titanium dioxide. 1. A method of forming a composite ceramic material , the method comprising:{'sub': 3', '3, 'mixing together materials that will form out a primary phase of aluminum oxide, a first secondary phase of CaTiOlocated within the primary phase, and a second secondary phase of LaAlOlocated within the primary phase, the materials forming the primary phase being generally non-reactive with materials forming the first and second secondary phases; and'}{'sup': −1', '−1, 'sintering the materials to form a composite ceramic having the primary phase and the first and second secondary phases, the composite ceramic having a dielectric constant of greater than 20 and a thermal conductivity of greater than 20 W·m·K.'}2. (canceled)3. The method of wherein the composite ceramic has a thermal conductivity of greater than 30 W·m·K.4. (canceled)5. The method of wherein the primary phase is generally contiguous.6. The method of wherein the composite ceramic has a dielectric constant of greater than 25.7. The method of wherein the composite ceramic has a dielectric constant of greater than 35.8. The method of wherein the composite ceramic has a temperature drift of resonant frequency lower than 1000 ppm/Degree C.9. The method of further comprising machining the composite ceramic.10. The method of further comprising forming a radiofrequency component from the composite ceramic.11. A method of forming a composite ceramic material claim 9 , the method comprising:{'sub': 3', '2', '6, 'mixing together materials that will form out a primary phase of aluminum oxide, a first secondary phase of CaTiOlocated within the ...

DUAL-PHASE HIGH THERMAL CONDUCTIVITY COMPOSITE DIELECTRIC MATERIALS

Disclosed herein are embodiments of materials having high thermal conductivity along with a high dielectric constants. In some embodiments, a two phase composite ceramic material can be formed having a contiguous aluminum oxide phase with a secondary phase embedded within the continuous phase. Example secondary phases include calcium titanate, strontium titanate, or titanium dioxide. 1. A radiofrequency component formed from a ceramic material comprising:a primary phase of aluminum oxide;{'sub': '3', 'a first secondary phase of CaTiO; and'}{'sub': '3', 'sup': −1', '−1, 'a second secondary phase of LaAlO, the first and second secondary phases located within the primary phase forming a composite ceramic material, the composite ceramic material having a dielectric constant of greater than 20 and a thermal conductivity of greater than 20 W·m·K.'}2. (canceled)3. (canceled)4. The radiofrequency component of wherein the radiofrequency component is incorporated into solid state lighting.5. The radiofrequency component of wherein the radiofrequency component is incorporated into a cellular tower.6. The radiofrequency component of wherein the primary phase is generally contiguous.7. The radiofrequency component of wherein the composite ceramic material has a dielectric constant of greater than 25.8. The radiofrequency component of wherein the composite ceramic material has a dielectric constant of greater than 35.9. The radiofrequency component of wherein the composite ceramic material and a thermal conductivity of greater than 30 W·m·K.10. A radiofrequency component formed from a ceramic material comprising:a primary phase of aluminum oxide;{'sub': '3', 'a first secondary phase of CaTiO; and'}{'sub': 2', '6, 'sup': −1', '−1, 'a second secondary phase of LgMgTiO, the first and second secondary phases located within the primary phase forming a composite ceramic material, the composite ceramic material having a dielectric constant of greater than 20 and a thermal conductivity ...

Internal cooling circuits for cmc and method of manufacture

A method for forming a ceramic matrix composite (CMC) component with an internal cooling channel includes partially densifying a first fiber preform to form a portion of a final ceramic matrix volume, machining a first channel into a surface of the partially densified first fiber preform, covering the first channel with a fibrous member to form a near net shape fiber preform with an internal passage formed by the first channel and the fibrous member, and densifying the near net shape fiber preform.

Transparent Polycrystalline Ceramic Material

A high performance transparent polycrystalline ceramic material is provided. The transparent polycrystalline ceramic material has a nitrogen-containing isotropic lattice structure and having 80% optical transmission at a wavelength between 3.86 and 4.30 microns through said material at 11 mm of thickness.