ПЬЕЗОЭЛЕКТРИЧЕСКИЙ И/ИЛИ ПИРОЭЛЕКТРИЧЕСКИЙ КОМПОЗИЦИОННЫЙ ТВЕРДЫЙ МАТЕРИАЛ, СПОСОБ ЕГО ПОЛУЧЕНИЯ И ПРИМЕНЕНИЕ ТАКОГО МАТЕРИАЛА

Изобретение относится к пьезоэлектрическому и/или пироэлектрическому композиционному материалу. Сущность: материал включает диэлектрическую матрицу (11), наполнитель по меньшей мере из одного неорганического пьезоэлектрического и/или пироэлектрического материала. Наполнитель включает нитевидные наночастицы (12), распределенные по всему объему твердой диэлектрической матрицы (11) с количеством по объему менее 50%. Основные направления удлинения нитевидных наночастиц (12) неорганического наполнителя, распределенного в диэлектрической матрице (11), имеют по существу изотропное распределение в твердой диэлектрической матрице (11). Изобретение также относится к способу изготовления и применения такого гибридного материала для получения конструкционных деталей и пленок на носителе, полученных осаждением на поверхности такого субстрата. Технический результат: высокий пьезоэлектрический и/или пироэлектрический отклик при сниженной доле функционального наполнителя, обеспечение сочетания пластичности ...

ПРОЦЕСС И СОСТАВ ДЛЯ ПРИСОЕДИНЕНИЯ ПЕНОКЕРАМИКИ С СОХРАНЕНИЕМ СТРУКТУРНЫХ И ФИЗИЧЕСКИХ ХАРАКТЕРИСТИК ПО ПОВЕРХНОСТИ СЦЕПЛЕНИЯ

Группа изобретений относится к керамическому связующему материалу, к композиционной структуре, включающей связующий материал, и к способу формирования отвержденной керамической структуры. Керамический связующий материал содержит по меньшей мере один волокнистый материал, флюсующий агент и загущающий агент, причем волокнистый материал имеет коэффициент теплового расширения , аналогичный коэффициенту теплового расширения по меньшей мере одного компонента подложки. Композиционная структура содержит первую и вторую подложки с различными коэффициентами теплового расширения, связующий материал и волокнистый материал. Способ формирования отвержденной керамической структуры включает операции по нанесению связующего материала, нагрев керамической структуры, при этом керамический связующий материал обжигают при заданной температуре для скрепления двух смежных торцов подложки. Технический результат, достигаемый при использовании группы изобретений, заключается в том, чтобы обеспечить скрепление керамических ...

КЛЕЯЩАЯ И ПОКРЫВАЮЩАЯ ТЕПЛОСТОЙКАЯ КОМПОЗИЦИЯ, ПОКРЫТИЕ ДЛЯ ИЗЛОЖНИЦЫ, ПОЛОТНО, СПОСОБ НАНЕСЕНИЯ ПОКРЫТИЯ И СПОСОБ ПОЛУЧЕНИЯ ТЕПЛОСТОЙКОГО ПОКРЫТИЯ В ВИДЕ ПОЛОТНА ИЗ ЭТОЙ КОМПОЗИЦИИ

Изобретение относится к клеящим и покрывающим композициям, обладающих хорошей теплостойкостью и превосходным сопротивлением износу, а также большим сроком службы после отверждения. Сущность изобретения: композицию изготавливают из двух компонентов: порошковой смеси, содержащей оксид циркония 20 - 70 мас. ч., алюминат натрия 1 - 10 мас. ч., оксид иттрия 0,4 - 10,5 мас. ч., диоксид кремния 9,5 - 78,6 мас. ч., и связующего - силиката натрия 12,36 - 84,55 мас. ч., в который добавлено 5 - 50,7 мас. ч. воды. Для использования в качестве покрытия для изложницы в композицию добавляют волокнистый теплостойкий материал в количестве 2 - 17 мас. ч. С помощью композиции может быть получено теплостойкое покрытие в виде полотна. 5 с.п. ф-лы.

СОЕДИНИТЕЛЬНЫЕ ЭЛЕМЕНТЫ ДЛЯ ЭЛЕКТРОДОВ ИЗ УГЛЕРОДНЫХ МАТЕРИАЛОВ И СПОСОБ ИХ ИЗГОТОВЛЕНИЯ

... 1. Соединительные элементы для электродов из углеродных материалов, отличающиеся тем, что они содержат углеродные волокна с активированной окислением поверхностью и дополнительно науглероженным покрытием, причем науглероженное покрытие является продуктом науглероживания покрывающего средства, выбранного из группы: воск, пек, природные смолы, термопластичные и термореактивные полимеры. 2. Соединительные элементы по п.1, отличающиеся тем, что углеродистые волокна имеют модуль упругости от 200 до 250 ГПа. 3. Соединительные элементы по п.1, отличающиеся тем, что имеют коэффициент линейного термического расширения от -0,5 до +0,1 мкм/(К·м) в направлении, параллельном боковой поверхности и от 1,7 до 2,1 мкм/(К·м) в перпендикулярной ему плоскости. 4. Соединительные элементы по п.1, отличающиеся тем, что углеродистые волокна имеют среднюю длину от 0,5 до 40 мм. 5. Соединительные элементы по п.1, отличающиеся тем, что массовая доля углеродных волокон в них составляет от 0,2 до 10%. 6. Соединительные ...

ВОЛОКНА НА ОСНОВЕ ОКСИДА ЦИРКОНИЯ/ОКСИДА МЕТАЛЛА

... 1. Способ получения волокна на основе циркония/оксида металла, включающий i) смешивание раствора соли металла или коллоидной дисперсии оксида металла, где упомянутый металл выбирают из группы, состоящей по меньшей мере из одного из металлов Группы IIA, переходного металла, металлов Группы IIIA и металлов Группы IIIB, с коллоидной дисперсией аморфного цирконийсодержащего полимера согласно формуле (I) [Zr4(OH)12(X)2(H2O)4]n (X)2n· 2nH2O, где Х представляет анион, совместимый с цирконийсодержащим полимером; n представляет целое число от 1 до менее 200, для создания смешанной коллоидной дисперсии; формование смешанной коллоидной дисперсии в волокно на основе циркония/металла. 2. Способ по п.1, в котором Х выбирают из группы, состоящей из NO3-, Cl- и ClCH2COO-. 3. Способ по п.2, дополнительно отличающийся тем, что упомянутая коллоидная дисперсия цирконийсодержащего полимера имеет соотношение Х к цирконию в диапазоне от около 1,0-0,98 до около 1,0-1,3 для поддержания упомянутой коллоидной дисперсии ...

Способ изготовления изделий из композитного C/C-SIC материала и продуктов на их основе

Группа изобретений относится к формованию керамических изделий, содержащих углеродные волокна, в частности к изготовлению изделий из композитного C/C-SiC материала. Способ включает следующие стадии: изготовление композитного порошка из углеродного волокна и фенольной смолы методом испарения растворителя, в соответствии с трехмерной моделью изделия формование из композитного порошка из углеродного волокна исходной формованной заготовки с помощью способа 3D-печати; первичную обработку посредством уплотнения исходной сформованной заготовки для получения пористого тела С/С, проведение реакции силицирования в расплаве, высокотемпературной десиликации и вторичного уплотнения пористого тела С/С для получения готового C/C-SiC изделия. Обеспечивается возможность получения изделия из композитного C/C-SiC материала сложной структуры с коротким циклом и низкими затратами, а готовое изделие из композитного C/C-SiC материала имеет низкое содержание остаточного кремния и превосходные технические характеристики ...

КЕРАМИЧЕСКАЯ КОМПОЗИЦИЯ И СПОСОБ ПОЛУЧЕНИЯ УКАЗАННОЙ КОМПОЗИЦИИ

ПОЛУЧЕНИЕ КОМПОЗИЦИОННЫХ МАТЕРИАЛОВ С КЕРАМИЧЕСКОЙ МАТРИЦЕЙ, СОДЕРЖАЩИХ УГЛЕРОДНЫЕ НАНОТРУБКИ И ГРАФЕН

ПЬЕЗОЭЛЕКТРИЧЕСКИЙ И/ИЛИ ПИРОЭЛЕКТРИЧЕСКИЙ КОМПОЗИЦИОННЫЙ ТВЕРДЫЙ МАТЕРИАЛ, СПОСОБ ЕГО ПОЛУЧЕНИЯ И ПРИМЕНЕНИЕ ТАКОГО МАТЕРИАЛА

... 1. Пьезоэлектрический и/или пироэлектрический композиционный твердый материал, названный гибридным материалом, содержащий:- твердую диэлектрическую матрицу (11),- неорганический наполнитель, распределенный в твердой диэлектрической матрице (11), где неорганический наполнитель состоит из материала, выбранного из группы, состоящей из пьезоэлектрических материалов, пироэлектрических материалов, и пьезоэлектрических и пироэлектрических материалов,в котором неорганический наполнитель содержит твердые наночастицы, названные нитевидными наночастицами (12), имеющие:- длину, продолжающуюся в основном направлении удлинения нитевидных наночастиц (12),- два размера, названные ортогональными размерами, продолжающиеся в двух поперечных направлениях, которые являются взаимно перпендикулярными и ортогональными по отношению к основному направлению удлинения нитевидных наночастиц (12), где ортогональные размеры меньше длины и меньше 500 нм, и- два соотношения, названные соотношениями сторон, между длиной ...

KERAMISCHE ZUSAMMENSETZUNG

FEUERFESTE ISOLIERUNGSZUSAMMENSETZUNG UND VERFAHREN ZU IHRER HERSTELLUNG

Keramischer Verbundwerkstoff.

VERFAHREN ZUR HERSTELLUNG EINES KARBONHALTIGEN FASERSTOFFS.

HERSTELLUNGSVERFAHREN EINES WABENFILTERS ZUR REINIGUNG VON ABGAS

Mehrschichtige keramische Platine, Verfahren zu ihrer Herstellung und ihre Anwendung.

Verfestigte Faserbündel

Die Erfindung betrifft ein Verfahren zur Herstellung von verfestigten Faserbündeln, umfassend die Schritte a) Auftragen einer Schmelze oder Lösung auf eine flächige Trägerbahn unter Bildung einer viskosen Beschichtung, b) Aufbringen paralleler Filamente auf diese so beschichtete Trägerbahn unter Zugspannung, c) Eindrücken der Filamente in die viskose Beschichtung unter Bildung eines Imprägnats, d) optional teilweise Verfestigung der Beschichtung bis zu einem plastisch verformbaren Zustand des Imprägnats durch mindestens einen der Schritte Verdampfen des Lösungsmittels, thermische Härtung, und Abkühlung, wobei diese Schritte nur in dem Maß ausgeführt werden, dass ein plastisch verformbarer Zustand erhalten bleibt, e) Aufrollen des Imprägnats auf einen Wickelkern zu einem Wickel unter Beibehaltung einer Wickelspannung der Filamente in dem Imprägnat, f) optional Fixierung des äußeren Wickels auf dem Wickelkern mittels wenigstens einer Manschette und/oder durch wenigstens ein Klebeband, g) ...

Verfahren zum Herstellen eines hochfesten Verbundkörpers aus Glas und Fasern

Verfahren zum Herstellen eines hochfesten Verbundkörpers aus Glas und Fasern, mit den folgenden Verfahrensschritten: 1.1 einem Kieselglaspulver werden Fasern zugesetzt, die eine gegenüber Glas erhöhte Festigkeit aufweisen; 1.2 der Anteil der Fasern beträgt zwischen 10 und 20 Gew.%, bezogen auf die Gesamtmenge aus Kieselglas und Fasern; 1.3 wobei die Fasern der Aufschlämmung aus Kieselglas orientiert oder in zufälliger Ausrichtung zugesetzt werden; 1.4 aus der Gesamtmenge von Kieselglas und Fasern wird ein Vorformling nach dem Schlickergussverfahren hergestellt; 1.5 der Vorformling wird gesintert, so dass der Verbundkörper entsteht, 1.6 wobei der Glaskörper porös ist.

Faserverstärkte keramische Verbundwerkstoffe

Faserverstärkte keramische Verbundwerkstoffe, dadurch gekennzeichnet, daß sie mindestens zwei Lagen aus multidirektionalem Fasergewebe als Verstärkung enthalten, wobei mindestens 5% der Fläche jeder Fasergewebelage von Matrixmaterial durchsetzt ist, Reibscheiben, die diese als Kern- oder Tragzone enthalten, Verfahren zu deren Herstellung und deren Verwendung als Brems- oder Kupplungsscheiben.

Composite material, components comprising same and method of using same

A composite material comprises 50 to 95 mass % grains of primary material selected from the group consisting of talc, mica, graphite and hexagonal boron nitride, and 0.01 to 40 mass % fibres having a length of 0.05 to 20 mm, and a ratio of length todiameter of at least 5. The grains of the primary material have a mean size of 3 to 150 microns. Preferably the composite comprises 0.01 to 40 mass % grains of secondary material selected from ceramic material, cubic boron nitride (cBN) or diamond. The fibres may comprise carbon, metal or ceramic material, and may be continuous fibres, single fibres, tangled fibres, chopped fibres or multi-fibres. Preferably the composite material comprises an inorganic binder. The composite material may be used as a component for an ultra-high pressure press, such as a gasket 10, containment vessel, electrically conducting heater element, an electrical insulation component or a reaction component.

CERAMIC CORE MOLDING COMPOSITION

Silicon carbide fibers essentially devoid of whiskers and method for preparation thereof

Nanotube and/or nanofibre synthesis

A method of producing nanotubes and/or nanofibres by the catalytic decomposition of a gas feedstock on a catalyst is disclosed is characterised in that the catalyst is impregnated and dispersed within a porous matrix. The porous matrix may be fibrous, a carbon based material, a ceramic based material or polymeric. The nanotubes/nanofibres may be removed from the matrix by dissolving, reacting, melting or vaporisisng. The carbon nanotubes are grown using ethylene and hydrogen as reactants. The product formed finds use as a filter, a heat spreader, packaging, a gas diffusion layer for a fuel cell, and on electromagnetic shield.

CERAMIC CORE MOLDING COMPOSITION

Coating for ceramic composites

A coating composition for use with ceramic composites to reduce gas permeability of the,composites as well as provide an adhesive force to the composites. The coating composition comprises an aqueous dispersion of an aluminum phosphate precursor, silicon carbide, and aluminoborosilicate. The ceramic composite to which the coating may be applied comprises a base fabric of aluminoborosilicate fibres, a carbonaceous layer on said base fabric and a silicon carbide layer coated over the carbonaceous layer.

High temperature thermal insulation material and method of making same

A thermal insulation material at high temperature comprising insulating mineral fibres bonded in a matrix, wherein the mineral fibres have a melting point higher than 1.000 DEG C. and represent 15 to 60% of the weight of the material, and wherein the matrix is formed, at least in part, by pyrolytic carbon which represents 18 to 40% of the weight of the material. A method for making such a material comprises dispersing a carbon-containing material such as a resin made of fibrous reinforcement, shaping by moulding the mixture thus obtained and pyrolysis of the carbon-containing material.

Method for preparing a SiC whisker-reinforced composite material

The invention provides a method for preparing a SiC whisker-reinforced composite material. A matrix material such as a metal, an alloy or a plastic is introduced into a fibrous base consisting of a SiC whisker sponge-like cake. The resultant structure is compressed into a desired shape as needed. The fibrous base is prepared by heating a mixture of silica gel or ashed rice hulls with a furnace carbon black and an additional amount of NaCl as a space forming agent for forming spaces conducive to whisker growth.

CERAMIC COMPOSITES

CERAMIC COMPOSITE

INSULATING REFRACTORY PRODUCTS HAVING HIGH POROSITY AND THEIR METHOD OF PREPARATION

... 1498158 Refractory products GROUPEMENT POUR LES ACTIVITES ATOMIQUES ET AVANCEES SA 22 Dec 1975 [15 Jan 1975 21 Nov 1975] 52503/75 Headings C1H and C1J An insulating isotropic refractory product having a coefficient of thermal conductivity about 0À1 Kcal/m./‹ C./hr, a Young's Modulus of about 20,000 kg/sq. cm. and a tensile strength of about 12 kg/sq. cm. is prepared according to the following steps: (i) dry dispersing in calcium aluminate cement of ceramic fibres containing a percentage of silica less than 15%, the percentage of ceramic fibres in relation to the total weight of the dry mixture being at least equal to 60% and not more than 70% by weight; (ii) forming of concrete by adding water and putting in a mould; stripping from the mould after the beginning of the setting; (iii) drying outside the mould at a temperature increasing by 10‹ C. per hour with prolonged stages at 100‹ C. and 300‹ C.; rising at the same rate from 300‹ C. to 800‹ C.; (iv) baking at 800‹ C. in the open, setting ...

FIBER-REINFORCED COMPOUND CERAMIC(S) AND PROCEDURE FOR THEIR PRODUCTION

CONNECTING PIECES FOR ELECTRODES FROM CARBON MATERIALS

CERAMIC(S) GRP COMPONENTS MATERIAL AND MANUFACTURING PROCESS FOR IT

MOUNTING PLATE MATERIAL FOR A KATALYSATORTRÄGER AND CATALYTIC CONVERTER

PROCEDURE FOR MAKING A FRICTION BODY OF SILICON-INFILTRATED, CARBON FIBER STRENGTHENING POROUS CARBON AND USE OF SUCH A FRICTION BODY

PROCEDURE FOR THE PRODUCTION OF CERAMIC(S) BRAKE DISKS WITH A DEPOSITOR IN GRÜNLING BEFORE PYROLYSIS

ROTARY BARREL FURNACE WITH FIREPROOF AGITATING BODIES FOR THE UMSCHMELZEN OF ALUMINUM

HONEYCOMB STRUCTURAL BODY

HONIGWABENSTRUKTUR AND PROCEDURE FOR THE PRODUCTION

GROUPS OF CERAMIC HOLLOW FIBERS, PROCEDURES FOR THEIR PRODUCTION AND THEIR USE

HONEYCOMB FILTER

KERAMISCHE MASSEN, VERFAHREN ZU DEREN HERSTELLUNG UND DEREN VERWENDUNG

BODY WITH HONEYCOMB STRUCTURE AND ASSOCIATED MANUFACTURING PROCESS

ON ISOTROPIC PITCH BASED HEAT-INSULATING MATERIALS

CERAMIC MASSES, PROCEDURES FOR THEIR PRODUCTION AND THEIR USE

HONEYCOMB STRUCTURE

SILICIUMCARBIDFASERVERSTAERKTER KERAMIKVERBUNDSTOFF

WITH DIAMOND MOLDED ARTICLES AND YOUR PRODUCTION COATED

PRECISION MOLD AND MANUFACTURING PROCESS

MULTILEVEL CERAMIC(S) GROUP

FIBER-REINFORCED COMPOUND BODY FOR PROTECTION ARMORING, ITS PRODUCTION AND USES

PROCEDURES FOR THE PRODUCTION OF A MEANS CARBON SHORT FIBER STRENGTHENED SILICON CARBIDE OF COMPOSITE MATERIAL

REFRACTORY FIBRES

High temperature resistant fibres

Integral titanium boride coatings on titanium surfaces and associated methods

Metal and ceramic nanofibers

Provided herein are nanofibers and processes of preparing nanofibers. In some instances, the nanofibers are metal and/or ceramic nanofibers. In some embodiments, the nanofibers are high quality, high performance nanofibers, highly coherent nanofibers, highly continuous nanofibers, or the like. In some embodiments, the nanofibers have increased coherence, increased length, few voids and/or defects, and/or other advantageous characteristics. In some instances, the nanofibers are produced by electrospinning a fluid stock having a high loading of nanofiber precursor in the fluid stock. In some instances, the fluid stock comprises well mixed and/or uniformly distributed precursor in the fluid stock. In some instances, the fluid stock is converted into a nanofiber comprising few voids, few defects, long or tunable length, and the like.

Inorganic fibrous molded refractory article, method for producing inorganic fibrous molded refractory article, and inorganic fibrous unshaped refractory composition

Disclosed is an inorganic fibrous molded refractory article having high biosolubility, which is capable of achieving desired heat resistance without containing ceramic fibers such as alumina silicate fibers, alumina powder and silica powder and is reduced in the production cost and the production price. Specifically disclosed is an inorganic fibrous molded refractory article which is characterized by being formed from a material that contains 2-95% by mass of biosoluble inorganic fibers having a solubility in physiological saline at 40C of not less than 1% by mass, 2-95% by mass of an inorganic powder having a needle-like crystal structure and 3-32% by mass of a binder. More specifically, the inorganic powder having a needle-like crystal structure has an average length of 1-3,000 m and an aspect ratio of 1-1,000.

CORDIERITE CERAMICS CONTAINING SIC WHISKER REINFORCEMENT

Graphite-based thermal dissipation component

CRACK-RESISTANT DRY REFRACTORY

PROCESS FOR THE MANUFACTURE OF SLABS AND PANELS OF CERAMIC MATERIAL AND PRODUCT OBTAINED THEREFROM

Compression/injection molding of polymer-derived fiber reinforced ceramic matrix composite materials

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.

WHISKER-REINFORCED CERAMIC CONTAINING ALUMINUM OXYNITRIDE AND METHOD OF MAKING THE SAME

A ceramic body (20), as well as a method for making the same, wherein the ceramic body contains aluminum oxynitride and whiskers, (and optionally) one or more of titanium carbonitride, and/or alumina, and/or zirconia, and/or other component(s).

MANUFACTURE OF CARBON SHAPED ARTICLES

CNT-INFUSED FIBERS IN CARBON-CARBON COMPOSITES

A carbon/carbon (C/C) composite includes a carbon matrix and a non- woven, carbon nanotube (CNT)-infused carbon fiber material. Where woven materials are employed, CNTs are infused on a parent carbon fiber material in a non- woven state. A C/C composite includes a barrier coating on the CNT-infused fiber material. An article is constructed from these (C/C) composites. A method of making a C/C composite includes winding a continuous CNT-infused carbon fiber about a template structure and forming a carbon matrix to provide an initial C/C composite or by dispersing chopped CNT-infused carbon fibers in a carbon matrix precursor to provide a mixture, placing the mixture in a mold, and forming a carbon matrix to provide an initial C/C composite.

NONCRYSTALLINE COMPOSITE ALKALI METAL TITANATE COMPOSITION AND FRICTION MATERIAL

A noncrystalline composite alkali metal titanate composition which is chemically stable, outstanding in resistance to hygroscopicity and suited as base materials for friction materials. The said composition comprises at least 60 wt.% of an alkali metal titanate represented by the general formula M2O.cndot.nTiO2 wherein M is one or at least two alkali metal elements and n is a number of 1 to 4, and at least 10 wt.% of SiO2, M2O/SiO2 being equal to or less than 2.5. When desired, it is possible to incorporate into the composition an oxide of at least one element selected from the group consisting of B, Mg, Al, P, Ca and Zn, and/or an oxide of at least one element selected from the group consisting of V, Cr, Mn, Fe, Co, Ni, Cu, Y, Zr, Nb and Ba.

PIEZOELECTRIC AND/OR PYROELECTRIC COMPOSITE SOLID MATERIAL, METHOD FOR OBTAINING SAME AND USE OF SUCH A MATERIAL

L'invention concerne un matériau, dit matériau hybride, solide composite piézoélectrique et/ou pyroélectrique comprenant : une matrice (11) diélectrique solide, une charge d'au moins un matériau inorganique piézoélectrique et/ou pyroélectrique, caractérisé en ce que ladite charge comprend des nanoparticules (12) filiformes réparties dans le volume de la matrice (11) diélectrique solide avec une quantité en volume inférieure à 50% et en ce que; les directions principales d'allongement des nanoparticules (12) filiformes de la charge inorganique répartie dans la matrice (11) diélectrique présentent une distribution sensiblement isotrope dans la matrice (11) diélectrique solide. L'invention s'étend à un procédé de fabrication et à l'utilisation d'un tel matériau hybride pour la réalisation de pièces structurelles et de films supportés déposés sur la surface d'un tel support pour : la détection de contraintes mécaniques par effet piézoélectrique direct, la détection de variations de température ...

PROCESS FOR PRODUCING INORGANIC FIBER

A process for producing an inorganic fiber superior in stretchability, which comprises; heating either a solution of a polymetalloxane in an organic solvent, the polymetalloxane content in the solution being at least 85% by weight and the viscosity of the solution at 25.degree.C being at least 6000 poises, or a solid state polymetalloxane to prepare a spinning liquid having a viscosity of 1 to 3000 poises; spinning the spinning liquid to form a precursor fiber; and baking the precursor fiber.

METHOD FOR PREPARING CONFIGURED SILICON CARBIDE WHISKER-REINFORCED ALUMINA CERAMIC ARTICLES

METHOD FOR PREPARING CONFIGURED SILICON CARBIDE WHISKER-REINFORCED ALUMINA CERAMIC ARTICLES A ceramic article of alumina reinforced with silicon carbide whiskers suitable for the fabrication into articles of complex geometry are provided by pressureless sintering and hot isostatic pressing steps. In accordance with the method of the invention a mixture of 5 to 10 vol.% silicon carbide whiskers 0.5 to 5 wt.% of a sintering aid such as yttria and the balance alumina powders is ballmilled and pressureless sintered in the desired configuration an inert atmosphere at a temperature of about 1800.degree.C to provide a self-supporting configured composite of a density of at least about 94% theoretical density. The composite is then hot isostatically pressed at a temperature and pressure adequate to provide configured articles of at least about 98% of theoretical density which is sufficient to provide the article with sufficient strength and fracture toughness for use in most structural applications ...

FIBER-REINFORCED SILICON NITRIDE COMPOSITE CERAMICS

Tough composites of polymer derived silicon carbide fibers in silicon nitride matrices, especially reaction bonded silicon nitride matrices, can be made by precoating the fibers with pyrolytic carbon and controlling the nitridation or other process which forms the silicon nitride matrix so that a thickness of at least 5 nanometers of carbon remains in the composite after it is formed. Failure of such composites is noncatastrophic. Alternatively, with at least some specific types of polymer derived silicon carbide fibers, composites with non-catastrophic failure can he made by controlling the nitriding conditions to produce an essentially void space around the fibers in the final composites. As still another alternative, the space around the fibers may be partially filled with silicon nitride whiskers generated during the nitridation process.

HIGH TEMPERATURE THERMAL INSULATION MATERIAL AND METHOD FOR MAKING SAME

The invention provides a thermal insulation material at high temperature comprising insulating mineral fibres bonded in a matrix, wherein: the mineral fibres have a melting point higher than 1000.degree.C and represent 15 to 60% of the weight of the material; and the matrix is formed, at least in part, by pyrolytic carbon which represents 18 to 40% of the weight of the material.

MANUFACTURE OF CARBON SHAPED ARTICLES

COATED CERAMIC FILLER MATERIALS

Coated ceramic filler materials comprised of ceramic particles, fibers, whiskers, etc. having at least two substantially continuous coatings thereon are provided. The coatings are selected so that the interfacial shear strength between the ceramic filler material and the first coating, between coatings, or between the outer coating and the surrounding matrix material, are not equal so as to permit debonding and pull-out when fracture occurs. The resultant, multi-coated ceramic filler materials may be employed to provide ceramic matrix composites with increased fracture toughness. The ceramic filler materials are designed to be particularly compatible with ceramic matrices formed by directed oxidation of precursor metals.

POROUS CARBON BASE MATERIAL, METHOD FOR PREPARATION THEREOF, GAS-DIFFUSING MATERIAL, FILM-ELECTRODE JOINTED ARTICLE, AND FUEL CELL

A porous carbon base material, which comprises a sheet containing carbon short fibers dispersed randomly and a carbonized resin, wherein the carbon short fibers are bound by the carbonized resin and the volume of pores having a pore diameter of 10 .mu.m or less is 0.05 to 0.16 cc/g; and a method for producing the porous carbon base material, which comprises transporting a precursor fiber sheet comprising carbon short fibers dispersed randomly and a resin intermittently to a space between heated plates, subjecting the precursor to a heating and pressuring treatment by the heated plates while the transformation stops, carrying out the transportation of the sheet after the treatment, and then carrying out a heat treatment, to thereby carbonize the resin in the sheet.

PRODUCTION OF FIBRES WITH REDUCED SHOT FORMATION

IMPROVED CEMENT TO MAKE THERMAL SHOCK RESISTANT CERAMIC HONEYCOMB STRUCTURES AND METHOD TO MAKE THEM

A ceramic honeycomb structure comprised of at least two separate smaller ceramic honeycombs that have been adhered together by a cement comprised of inorganic fibers and a binding phase wherein the smaller honeycombs and fibers are bonded together by the binding phase which is comprised of an amorphous silicate, aluminate or alumino-silicate glass and the cement has at most about 5% by volume of other inorganic particles. The cement may be made in the absence of other inorganic and organic additives while achieving a shear thinning cement, for example, by mixing oppositely charged inorganic binders in water together so as to make a useful cement for applying to the smaller honeycombs to be cemented.

CERAMIC-CERAMIC COMPOSITE FILTER

... 2109089 9220638 PCTABS00017 A ceramic fiber-ceramic composite filter having a support composed of ceramic fibers, preferably texturized, a carbonaceous layer thereover, and a silicon carbide coating over the carbonaceous layer and coated on substantially all of the fibers. A strong, tough, lightweight filter is achieved which is especially useful in high temperature gas environments.

CERAMIC MATERIAL

FS 1403 CERAMIC MATERIAL The invention relates to composite ceramic materials strengthened by the incorporation of ceramic fibres and to a method of making such materials. A novel composite ceramic material comprises an alumina matrix (11) containing mullite formations (12) formed from a colloidal silica filler and alumina fibres (10), part at least of the mullite growth (12) being on the surface of the fibres (10). The composite ceramic material is made by forming an aqueous slurry containing a dispersion of the fibres, filler, colloidal silica and rheological agents, forming the slurry to the desired shape and firing the product. The ceramic matrix material is particularly suitable for the manufacture of ceramic foam filters.

CERAMIC COMPOSITE VALVE FOR INTERNAL COMBUSTION ENGINES AND THE LIKE

A ceramic composite valve for an internal combustion engine or the like is disclosed. The valve includes (a) an elongated valve stem shaped for insertion in the valve guide of an engine and comprising a ceramic sleeving which is packed with an axially aligned unidirectional cluster of ceramic reinforcing fibers; and (b) a ceramic bell shaped for mating with the valve seat of an engine and containing discontinuous ceramic fibers; one end of said sleeving being molded into the bell to form a valve-shaped structure; and said valve shaped structure being impregnated and rigidized with a matrix of carbon, other ceramic material, or both carbon and other ceramic material, and coated with a hard ceramic coating which is resistant to oxidation and wear. Also disclosed are various preform valves, and a method of making ceramic valves and preform valves.

FIBRE-REINFORCED COMPOSITE CERAMICS AND METHOD OF PRODUCING THE SAME

The invention concerns fibre-reinforced composite ceramics with high- temperature fibres, in particular based on Si/C/B/N, which are bound in term s of reaction to an Si-based matrix. These composite ceramics are produced by impregnating bundles of fibrous material comprising Si/C/B/N fibres with a binder which is suitable for pyrolysis and solidifying the binder, the fibro us material bundles then optionally being conditioned with a silicating protective layer suitable for pyrolysis, such as for example phenolic resin or polycarbosilane. Subsequently a mixture of fibrous material bundles, fillers , such as for example SiC and carbon in the form of graphite or carbon black, and binders is produced. The mixture is then compacted to form a green compa ct which is then pyrolysed under vacuum or protective gas in order to produce a porous shaped body which is then infiltrated, preferably under vacuum, with molten silicon. In this way, fibre-reinforced composite ceramics which have greatly improved ...

PROTETHI ELEMENT.

SILICON CARBIDE-FIBER-REINFORCED CERAMIC(S) COMPOUND MATERIAL.

Composant horloger flexible et mouvement d'horlogerie comportant un tel composant.

L'invention concerne un composant horloger flexible, notamment pour mécanisme oscillateur ou pour barillet d'un mouvement horloger, le composant comportant au moins une partie réalisée en une matière composite (1), la matière composite (1) comprenant une matrice (2) et une multitude de nano-fils (3) répartis dans la matrice (2), les nano-fils (3) étant juxtaposés, la matrice (2) comportant un matériau (4) de remplissage des interstices entre les nano-fils (3) pour les joindre les uns aux autres, chaque nano-fil (3) formant un tube plein monobloc.

Composant horloger flexible pour mécanisme oscillateur, comprenant un matériau de compensation thermique.

L'invention concerne un composant horloger flexible pour mécanisme oscillateur d'un mouvement horloger, le composant comportant au moins une partie réalisée en une matière composite (1), la matière composite (1) comprenant une matrice (2) et une multitude de nanotubes ou de nano-fils (3) répartis dans la matrice (2), les nanotubes ou nano-fils (3) étant juxtaposés et disposés de manière sensiblement parallèles à un axe (A) sensiblement perpendiculaire au plan (P) du composant, la matrice comportant un matériau de remplissage (4) flexible pour remplir les interstices entre les nanotubes ou nano-fils (3), le matériau de remplissage (4) comprenant au moins en partie un matériau de compensation thermique dont le coefficient de thermoélasticité est de signe opposé à celui des autres matériaux de la matière composite (1).

Composant horloger rigide pour mécanisme oscillateur ou pour mécanisme d'échappement et mouvement d'horlogerie comportant un tel composant.

L'invention concerne un composant horloger rigide pour mécanisme oscillateur ou pour mécanisme d'échappement d'un mouvement horloger, le composant comportant au moins une partie réalisée en une matière composite (1), la matière composite (1) comprenant une matrice (2) et une multitude de nanotubes ou de nano-fils (3) répartis dans la matrice (2), les nanotubes ou nano-fils (3) étant juxtaposés et disposés de manière sensiblement parallèles à un axe (A) sensiblement perpendiculaire au plan (P) du composant, la matrice (2) comporte un matériau rigide (4) pour remplir les interstices et joindre les nanotubes ou nano-fils (3) les uns aux autres, le matériau (4) ayant des propriétés mécaniques rigides pour s'opposer à la déformation élastique du composant.

Procédé de fabrication d'un composant horloger en matériau composite.

La présente invention concerne un procédé de fabrication d'un composant horloger (50) en matériau composite à matrice céramique comportant les étapes suivantes : déposer dans un moule une succession de couches (10, 20, 30, 40) comprenant chacune une poudre céramique (12), au moins une couche (10, 20, 30, 40) comportant en outre des fibres mélangées à la poudre céramique (12), les fibres étant disposées de manière aléatoire; effectuer une opération de frittage FAST/SPS; démouler le composant horloger fritté comportant la succession de couches (10, 20, 30, 40), et optionnellement usiner le composant fritté aux dimensions finales du composant horloger (50). Les fibres sont visibles en surface du composant horloger (50).

SELF-ALIGNING CONCRETE

ПРИМЕНЕНИЕ ЭЛЕМЕНТОВ ИЗ УПРОЧНЕННОГО ВОЛОКНАМИ КОМПОЗИЦИОННОГО МАТЕРИАЛА С КЕРАМИЧЕСКОЙ МАТРИЦЕЙ

... 1. Применение элементов из упрочненного волокнами композиционного материала с керамической матрицей, содержащей, по меньшей мере, 10 мас.% карбида кремния и, по меньшей мере, 5 мас.% углерода, причем доля углеродных и/или графитовых волокон относительно массы волокон составляет, по меньшей мере, 5 мас.%, для частичного или полного поглощения, по меньшей мере, ударной, концентрированной нагрузки, причем, по меньшей мере, один из размеров элемента в направлении перпендикулярно нагрузке составляет, по меньшей мере, 3 см. 2. Применение по п.1 для частичного или полного поглощения, по меньшей мере, ударной, концентрированной нагрузки, причем керамическая матрица композиционного материала содержит также фазы углерода и/или кремния. 3. Применение, по меньшей мере, по любому из пп.1 или 2 для частичного или полного поглощения, по меньшей мере, ударной, концентрированной нагрузки, причем композиционные материалы, из которых состоят элементы, содержат также или лишь исключительно волокна из окиси ...

REFRACTORY MAGNESIA CEMENT

Inorganic fiber, fiber structure and method for producing same

The invention relates to an inorganic fibers consisting substantially of silicon, carbon, oxygen and a transition metal, having a fiber size of no greater than 2 [mu]m and having fiber lengths of 100 [mu]m or greater.

Coating for ceramic composites.

COMPOSITE ROLL ANNEALING LINE

CONTAINER AND METHOD FOR SEALING A CONTAINER OPENING

단열재

... 경량이며 열전도율 증가가 억제된 다공질 소결체로 이루어지는 단열재, 즉, 고온에서의 단열 특성을 유지하면서, 경량이며, 시공시의 핸들링성을 향상시킬 수 있는 단열재를 제공한다. 본 발명의 단열재의 하나의 양태는, 기공률이 70 체적% 이상 91 체적% 미만인 다공질 소결체로 이루어지고, 구멍 직경 0.8 ㎛ 이상 10 ㎛ 미만의 기공이, 전체 기공 체적 중, 10 체적% 이상 70 체적% 이하를 차지하면서, 또한 구멍 직경 0.01 ㎛ 이상 0.8 ㎛ 미만의 기공이, 전체 기공 체적 중, 5 체적% 이상 30 체적% 이하를 차지하고, 상기 다공질 소결체가, MgAl2O4(스피넬) 원료와, 무기 재료로 이루어지는 섬유로 형성된 것이고, 1000℃ 이상 1500℃ 이하에서의 열전도율이 0.40 W/(m·K) 이하이며, 상기 다공질 소결체에 있어서의 Mg에 대한 Si의 중량비가 0.15 이하이다.

HONEYCOMB FILTER

금속 및 세라믹 나노 섬유들

... 나노 섬유들(nanofibers) 및 나노 섬유들을 제조하기 위한 방법들이 여기에 제공된다. 어떤 예들에서, 상기 나노 섬유들은 금속 및/또는 세라믹 나노 섬유들이다. 어떤 실시 예들에서, 상기 나노 섬유들은 고품질, 고성능 나노 섬유들, 매우 연속적인 나노 섬유들, 또는 이와 유사한 것이다. 어떤 실시 예들에서, 상기 나노 섬유들은 증가된 코히어런스(coherence), 증가된 길이, 거의 없는 공동들(voids) 및/또는 결함들(defects), 및/또는 다른 유리한 특성들을 가진다. 어떤 예들에서, 나노 섬유들이 유체 원료(fluid stock) 내에 높은 로딩(loading)의 나노 섬유 전구체(precursor)를 가지는 상기 유체 원료를 전자 방사(electrospinning)함으로써 생성된다. 어떤 예들에서, 상기 유체 원료는 유체 원료 내에 잘 혼합된 및/또는 균일하게 분포된 전구체를 포함한다. 어떤 예들에서, 상기 유체 원료는 공동들과 결함들을 거의 가지지 않고 길거나 조정 가능한 길이 등을 가지는 나노 섬유로 변환된다.

Refractory material with stainless steel and organic fibers

A refractory includes a cement, a binder and a matrix. The matrix comprises both stainless steel fibers and organic fibers. The refractory can be easily cast, without additional steel reinforcement, into large fire wall 16 panels 10 capable of meeting the requirements of testing conducted in accordance with ASTM E-119, Standard Test Methods for Fire Tests of Building Construction and Materials in support of IEEE Std. 979-1994, Guide for Substation Fire Protection . The fire wall 16 assembly withstood the fire endurance test without passage of flame and gases hot enough to ignite cotton waste during a four-hour fire exposure. The assembly also withstood a 45 psi water stream for five minutes immediately following the four-hour fire exposure period. This is a stringent mechanical requirement, as all fire walls 16 must maintain their integrity before, during and after a fire, per the Universal Building Code's definition of a true fire wall 16.

Biosoluble inorganic fiber

An inorganic fiber having the following composition: 71 wt % to 80 wt % of SiO 2 , 18 wt % to 27 wt % of CaO, 0 to 3 wt % of MgO, and 1.1 wt % to 3.4 wt % of Al 2 O 3 , wherein the amount of each of ZrO 2 and R 2 O 3 (R is selected from Sc, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y or mixtures thereof) is 0.1 wt % or less, the amount of each alkaline metal oxide is 0.2 wt % or less and the total amount of SiO 2 , CaO, MgO and Al 2 O 3 is 99 wt % or more.

Composite Material of Electroconductor Having Controlled Coefficient of Thermical Expansion

The present invention relates to a composite material comprising a ceramic component, characterized in that it has a negative coefficient of thermal expansion, and carbon nanofilaments, to its obtainment process and to its uses as electrical conductor in microelectronics, precision optics, aeronautics and aerospace.

Carbon nanotube and nanofiber film-based membrane electrode assemblies

A membrane electrode assembly (MEA) for a fuel cell comprising a catalyst layer and a method of making the same. The catalyst layer can include a plurality of catalyst nanoparticles, e.g., platinum, disposed on buckypaper. The method can include the steps of placing buckypaper in a vessel with a catalyst-precursor salt and a fluid. The temperature and pressure conditions within the vessel are modified so as to place the fluid in the supercritical state. The supercritical state of the supercritical fluid containing the precursor salt is maintained for period of time to impregnate the buckypaper with the catalyst-precursor salt. Catalyst nanoparticles are deposited on the buckypaper. The supercritical fluid and the precursor are removed to form a metal catalyst impregnated buckypaper.

Sheet-like fiber structure, and battery, heat insulation material, waterproof sheet, scaffold for cell culture, and holding material each using the sheet-like fiber structure

A sheet-like fiber structure including a plurality of fibers made of amorphous silicon dioxide. The plurality of fibers are intertwined with each other and thus connected to each other, thereby forming void portions. Consequently, the sheet-like fiber structure has not only liquid permeability and voltage resistance but also high heat resistance and chemical resistance. The sheet-like fiber structure is therefore applicable to a separator for preventing a short circuit between electrodes, a scaffold for cell culture, to holding a biomolecule, or the like.

Method for laying carbon nanotube film

A method for laying carbon nanotube film includes following steps. A carbon nanotube film is provided. The carbon nanotube film includes a number of carbon nanotube strings substantially parallel to each other and extending along a first direction. The carbon nanotube film is stretched along a second direction substantially perpendicular with the first direction to form a deformation along the second direction. The carbon nanotube film is placed on a surface of a substrate. The deformation along the second direction is kept.

Corrugated carbon fiber preform

In one example, a method includes mixing a plurality of carbon fibers in a liquid carrier to form a mixture, depositing the carbon fiber mixture in a layer, forming a plurality of corrugations in the carbon fiber layer, and rigidifying the corrugated carbon fiber layer to form a corrugated carbon fiber preform. In another example, a method includes substantially aligning a first ridge on a first surface of a first corrugated carbon fiber preform and a first groove on a first surface of a second corrugated carbon fiber preform, bringing the first surface of the first corrugated carbon fiber preform into contact with the first surface of the second corrugated carbon fiber preform, and densifying the first corrugated carbon fiber preform and the second carbon fiber preform to bond the first corrugated carbon fiber preform and the second carbon fiber preform.

Method for fabricating a ceramic material

A method for fabricating a ceramic material includes impregnating a porous structure with a mixture that includes a preceramic polymer and a filler. The filler includes at least one free metal. The preceramic polymer material is then rigidized to form a green body. The green body is then thermally treated to convert the rigidized preceramic polymer material into a ceramic matrix located within pores of the porous structure. The same thermal treatment or a second, further thermal treatment is used to cause the at least one free metal to move to internal porosity defined by the ceramic matrix or pores of the porous structure.

Method of forming ceramic coatings and ceramic coatings and structures formed thereby

A method of forming a ceramic coating, the resulting ceramic coating, and structures produced by forming the ceramic coating on a ceramic fiber shape. The method includes forming an aqueous mixture containing water, an alumino-silicate precursor, and a dispersion of a ceramic fiber material. The alumino-silicate precursor contains a colloidal suspension of silica particles, silica fume particles, and micron-sized and submicron-sized alumina particles. The ceramic fiber material includes micron-sized and submicron-sized ceramic fibers. The aqueous mixture is applied to a surface of a ceramic fiber shape, after which the aqueous mixture is cured to form a ceramic coating that contains the ceramic fiber material dispersed in an alumino-silicate matrix.

Refractory metal ceramics and methods of making thereof

A composition having nanoparticles of a refractory-metal carbide or refractory-metal nitride and a carbonaceous matrix. The composition is not in the form of a powder. A composition comprising a metal component and an organic component. The metal component is nanoparticles or particles of a refractory metal or a refractory-metal compound capable of decomposing into refractory metal nanoparticles. The organic component is an organic compound having a char yield of at least 60% by weight or a thermoset made from the organic compound. A method of combining particles of a refractory metal or a refractory-metal compound capable of reacting or decomposing into refractory-metal nanoparticles with an organic compound having a char yield of at least 60% by weight to form a precursor mixture.

Honeycomb structure comprising a cement skin composition with crystalline inorganic fibrous material

Disclosed is a honeycomb support structure comprising a honeycomb body and an outer layer or skin formed of a cement that includes an inorganic filler material having a first coefficient of thermal expansion from 25° C. to 600° C. and a crystalline inorganic fibrous material having a second coefficient of thermal expansion from 25° C. to 600° C.

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.

Carbon composite material

A carbon composite material which comprises Lyocell-based carbon fiber and a carbon matrix is provided. The carbon composite material has excellent physical properties, including low thermal conductivity, excellent interfacial adhesion and excellent strength, compared to carbon composite materials prepared using conventional polyacrylonitrile-based carbon fiber, pitch-based carbon fiber or the like. In addition, the carbon composite material is environmentally friendly and has low production costs compared to carbon composite materials comprising conventional rayon-based carbon fiber produced using a highly toxic carbon disulfide solvent.

Ceramic matrix composite, method of making a ceramic matrix composite, and a pre-preg composite ply

A composite, method of making the composite and a pre-pre composite ply are provided. The composite includes a first layer, a second layer and a third layer. The first layer includes at least one ply of unidirectional tape. The second layer is adjacent the first layer and includes at least one composite ply. The at least one composite ply includes a thin continuous matrix ply sheet having a plurality of randomly oriented unidirectional tape segments thereon. The third layer is adjacent the second layer and includes at least one ply of unidirectional tape. The ceramic matrix composite provides about 15% to about 20% strength relative to a composite comprising all unidirectional plies and the ceramic matrix composite has a bending length of 3 cm to 25 cm based on a Shirley stiffness test.

PROCESS FOR OBTAINING COMPOSITE, ULTRA-REFRACTORY, FIBRE-REINFORCED CERAMIC MATERIALS

The present invention relates to a process for preparing a composite, ultra-refractory, fibre-reinforced ceramic material obtained through the infiltration of carbon and/or silicon carbide fibres with a ceramic suspension comprising yttrium, lanthanum and/or scandium compounds, and the subsequent densification of the composite. The fibre-reinforced UHTC compounds obtained by the process can be used for making items intended for use in extreme temperature and pressure conditions. 1. A process for preparing a composite , ultra-refractory , fibre-reinforced ceramic material comprising:(i) infiltrating a plurality of fibres selected from carbon fibres, silicon carbide fibres and combinations thereof, with a ceramic suspension, thereby obtaining an infiltrated composite material, and drying the infiltrated composite material, wherein the ceramic suspension comprises:(A) a mixture of solid ceramic phases comprising:{'sub': 2', '2', '2', '2', '2, '(a) an amount greater than or equal to 55 vol. % of an ultra-refractory ceramic component selected from the group consisting of ZrB, HfB, TaB, TiB, NbB, ZrC, HfC, TiC, NbC, TaC and mixtures thereof;'}(b) 0-30 vol. % of SiC;(c) 0.1-15 vol. % of at least one compound selected from the group consisting of scandium, yttrium, lanthanum compounds and mixtures thereof; and(B) a dispersant selected from the group consisting of water, organic solvents, liquid organic precursors of SiC, liquid organic precursors of carbon and mixtures thereof;(ii) consolidating the dried composite material at a temperature comprised in the range 1700°-2000° C.2. The process according to claim 1 , wherein the fibres are carbon fibres.3. The process according to claim 1 , wherein the ceramic suspension comprises:(A) a mixture of solid ceramic phases comprising:{'sub': 2', '2', '2', '2', '2, '(a) 55-96 vol. %, of an ultra-refractory ceramic component selected from the group consisting of ZrB, HfB, TaB, TiB, NbB, ZrC, HfC, TiC, NbC, TaC and mixtures thereof ...

Fabrication and application of nanofiber ribbons and sheets and twisted and non-twisted nanofiber yarns

A nanofiber forest on a substrate can be patterned to produce a patterned assembly of nanofibers that can be drawn to form nanofiber sheets, ribbons, or yarns.

A CVI DENSIFICATION INSTALLATION INCLUDING A HIGH CAPACITY PREHEATING ZONE

A thermochemical treatment installation includes a reaction chamber, at least one gas inlet, and a gas preheater chamber situated between the gas inlet and the reaction chamber. The preheater chamber has a plurality of perforated distribution trays held spaced apart one above another. The preheater chamber also includes, between at least the facing distribution trays, a plurality of walls defining flow paths for a gas stream between said trays. 1. A thermochemical treatment installation comprising a reaction chamber , at least one gas inlet , and a gas preheater chamber situated between the gas inlet and the reaction chamber said preheater chamber having a plurality of perforated distribution trays held spaced apart one above another , wherein the preheater chamber also includes , between at least two facing distribution trays , a plurality of walls defining flow paths for a gas stream between said trays , each wall extending vertically between said at least two facing distribution trays.2. An installation according to claim 1 , wherein the distribution trays are disk-shaped and wherein at least some of the walls extend between said trays in a radial direction.3. An installation according to claim 1 , wherein at least some of the walls present an undulating shape.4. An installation according to claim 1 , wherein the walls present thermal conductivity that is greater in a direction parallel to the distribution trays than in a direction perpendicular to said perforated trays.5. An installation according to claim 4 , wherein the walls are made of composite material having fiber reinforcement densified by a matrix claim 4 , and wherein the reinforcing fibers extend for the most part in a direction parallel to the distribution trays.6. An installation according to claim 4 , wherein the walls are made of graphite.7. An installation according to claim 2 , wherein the number of walls is greater in the vicinity of the peripheries of the distribution trays than in the centers ...

Heat insulator

One aspect of the heat insulator of the present invention includes a porous sintered body having a porosity of 70 vol % or more and less than 91 vol %, and pores having a pore size of 0.8 μm or more and less than 10 μm occupy 10 vol % or more and 70 vol % or less of the total pore volume, while pores having a pore size of 0.01 μm or more and less than 0.8 μm occupy 5 vol % or more and 30 vol % or less of the total pore volume. The porous sintered body is formed from an MgAl 2 O 4 (spinel) raw material and fibers formed of an inorganic material, the heat conductivity of the heat insulator at 1000° C. or more and 1500° C. or less is 0.40 W/(m·K) or less, and the weight ratio of Si relative to Mg in the porous sintered body is 0.15 or less.

Whisker-reinforced hybrid fiber by method of base material infusion into whisker yarn

A hybrid fiber consists of a continuous phase base material that permeates the length of the hybrid fiber and a plurality of fibrils or nanotubes that are dispersed throughout the hybrid fiber interior in the form of a yarn woven from the plurality of fibrils or nanotubes. The method of making the hybrid fiber involves coating the yarn with the continuous phase base material and infusing the continuous phase base material into the plurality of fibrils or nanotubes that form the yarn.

Manufacturing of single or multiple panels

A method of manufacturing of a structured cooling panel includes cutting of desized 2D ceramic into tissues; slurry infiltration in the tissues by at least one knife blade coating method; laminating the tissues in a multi-layer panel, with slurry impregnation after each layer, wherein the tissue has combined fibres and/or pre-build cooling holes; drying; de-moulding; sintering the multi-layer panel, wherein part of the combined fibres burns out during the sintering process leaving a negative architecture forming the cooling structure and/or the pre-build cooling holes define the cooling structure; finishing, using of i) post-machine, and/or ii) surface smoothening/rework, and/or iii) coating application, and/or other procedures.

SEED CRYSTAL HOLDER FOR PULLING UP SINGLE CRYSTAL AND METHOD OF MANUFACTURING SILICON SINGLE CRYSTAL USING THE SAME

A seed crystal holder for pulling up a single crystal is made of a carbon fiber-reinforced carbon composite material, and has a substantially cylindrical shape with a hollow space having a shape matching an outer shape of a substantially rod-shaped seed crystal. A direction of carbon fibers at a part in contact with at least an outer peripheral surface of the seed crystal has isotropy as viewed from a central axis of the hollow space. 1. A method of manufacturing a silicon single crystal by Czochralski (CZ) method , comprising:setting a seed crystal to a seed crystal holder;lowering the seed crystal holder to dip the seed crystal into a silicon melt; andpulling up the seed crystal with the seed crystal holder to grow the silicon single crystal,wherein the seed crystal holder is made of a carbon fiber-reinforced carbon composite material and has a substantially cylindrical shape with a hollow space having a shape matching an outer shape of a substantially rod-shaped seed crystal, a core part in which a direction of carbon fibers has isotropy as viewed from a center axis of the hollow space; and', 'a clad part in which the direction of the carbon fibers has anisotropy as viewed from the center axis of the hollow space, and, 'wherein the seed crystal holder includeswherein the core part is provided at least at a part contacting an outer peripheral surface of the seed crystal.2. The method of manufacturing the silicon single crystal as claimed in claim 1 , wherein the direction of the carbon fibers constituting the core part has a circumferential direction component.3. The method of manufacturing the silicon single crystal as claimed in claim 2 , wherein the direction of the carbon fibers constituting the core part has a component parallel to the center axis.4. The method of manufacturing the silicon single crystal as claimed in claim 1 , wherein the seed crystal holder includes:a cylindrical upper section having a first hole diameter,a cylindrical intermediate section ...

METHOD OF DEPOSITING NANOSCALE MATERIALS WITHIN A NANOFIBER NETWORK AND NETWORKED NANOFIBERS WITH COATING

Provided herein is a method of making a conductive network by combining uncoated carbon nanotubes and carbon nanotubes coated with an electroactive substance to create an electrically conductive network; and redistributing at least a portion of the electroactive substance. Also provided herein is an electrically conductive network with an active material coating; first carbon nanotubes coated with the active material coating; and second carbon nanotubes partially coated with the active material coating, wherein at least a portion of the surfaces of the second carbon nanotubes directly contact surfaces of other second carbon nanotubes without the active material coating between these second carbon nanotubes, and wherein the first carbon nanotubes and the second carbon nanotubes are entangled to form an electrically conductive network. 1. A method of making a conductive network , comprising the steps of:(a) Combining uncoated carbon nanotubes and coated carbon nanotubes coated with an electroactive substance to create an electrically conductive network; and(b) redistributing at least a portion of the electroactive substance.2. The method of claim 1 , wherein the combining uncoated carbon nanotubes and the coated carbon nanotubes coated with an electroactive substance to create an electrically conductive network comprises:entangling the uncoated carbon nanotubes and the carbon nanotubes with the electroactive substance such that the entanglement creates an electrically conductive network of uncoated carbon nanotubes entangled with coated carbon nanotubes coated with the electroactive substance.3. The method of claim 1 , wherein the electroactive substance comprises a chemically active nanoscale solid substance.4. The method of claim 1 , wherein the redistributing at least a portion of the electroactive substance comprises:removing a portion of the electroactive substance from the coated carbon nanotubes coated with the electroactive substance into a solution, and ...

CERAMIC MATRIX COMPOSITE ARTICLES AND METHODS FOR FORMING SAME

A ceramic matrix composite article includes a melt infiltration ceramic matrix composite substrate comprising a ceramic fiber reinforcement material in a ceramic matrix material having a free silicon proportion, and a chemical vapor infiltration ceramic matrix composite outer layer comprising a ceramic fiber reinforcement material in a ceramic matrix material having essentially no free silicon proportion disposed on an outer surface of at least a portion of the substrate. 1. A ceramic matrix composite article comprising:a melt infiltration ceramic matrix composite substrate comprising a ceramic fiber reinforcement material in a ceramic matrix material having a free silicon proportion;a chemical vapor infiltration ceramic matrix composite outer layer comprising a ceramic fiber reinforcement material in a ceramic matrix material having no free silicon disposed on an outer surface of at least a portion of said substrate.2. The ceramic matrix composite article of wherein said substrate comprises generally silicon carbide and free silicon claim 1 , and said outer layer comprises generally pure silicon carbide.3. The ceramic matrix composite article of wherein said substrate comprises generally silicon carbide and free silicon claim 1 , and said outer layer comprises generally silicon carbide and free carbon.4. The ceramic matrix composite article of wherein said substrate comprises a first creep resistance claim 1 , said outer layer comprises a second creep resistance claim 1 , and said second creep resistance being greater than said first creep resistance.5. The ceramic matrix composite article of wherein said substrate comprises a first temperature capability claim 1 , said outer layer comprises a second temperature capability claim 1 , and said second temperature capability being greater than said first temperature capability.6. The ceramic matrix composite article of wherein said substrate comprises a prepreg melt infiltration ceramic matrix composite substrate.7. ...

COMPOSITE MATERIAL AND METHOD FOR MAKING

A method for making a composite material includes disposing a quantity of liquid comprising at least 90 weight percent molten boron within pores of a porous preform, the preform comprising a preform material; and reacting at least a portion of the molten boron with a portion of the preform material to form a solid ceramic reaction product, thereby forming a ceramic matrix composite material. An article comprises a composite material; the composite material comprises a fibrous phase disposed within a matrix. The matrix comprises silicon carbide, boron carbide, and boron silicide. 1. A method for making a composite material , the method comprising:disposing a quantity of liquid comprising at least 90 weight percent molten boron within pores of a porous preform, the preform comprising a preform material; andreacting at least a portion of the molten boron with a portion of the preform material to form a solid ceramic reaction product, thereby forming a ceramic matrix composite material.2. The method of claim 1 , wherein the preform material comprises silicon carbide claim 1 , carbon claim 1 , boron carbide claim 1 , boron nitride claim 1 , or a combination including one or more of the foregoing.3. The method of claim 1 , wherein the preform material comprises silicon carbide.4. The method of claim 1 , wherein the preform material comprises a plurality of fibers.5. The method of claim 4 , wherein the fibers further comprise at least one coating disposed on a surface of the fibers.6. The method of claim 5 , wherein the at least one coating comprises boron nitride claim 5 , silicon-doped boron nitride claim 5 , elemental carbon claim 5 , or a combination including one or more of the foregoing.7. The method of claim 1 , further comprisingforming a scaffold comprising fibers, the fibers comprising silicon carbide; anddisposing an additional material comprising silicon carbide on the scaffold via chemical vapor infiltration to form the preform.8. The method of claim 1 , ...

Ceramic Composite Materials and Methods

Provided herein are methods of making composite materials. The methods may include infiltrating a carbon nanoscale fiber network with a ceramic precursor, curing the ceramic precursor, and/or pyrolyzing the ceramic precursor. The infiltrating, curing, and pyrolyzing steps may be repeated one or more times. Composite materials also are provided that include a ceramic material and carbon nanoscale fibers.

CMC SYSTEM FOR IMPROVED INFILTRATION

A method is provided in which multiple layers are formed. Each of the layers includes at least a first set of ceramic fibers and a second set of ceramic fibers. The first set is arranged at an angle with respect to the second set. The first set and the second set define a plurality of pores therebetween. The layers are arranged on top of each other to form a porous preform. The pores of the layers arranged on top of each other are aligned. The pores define a plurality of channels extending continuously through the porous preform from a first side of the porous preform to a second side of the porous preform. Each channel comprises one inlet at the first side of the porous preform and one outlet at the second side of the porous preform. The porous preform is infiltrated with a matrix material. 1. A method comprising:forming a plurality of layers, each of the layers including at least a first set of ceramic fibers and a second set of ceramic fibers, wherein the first set is arranged at an angle with respect to the second set, wherein the first set and the second set define a plurality of pores therebetween;arranging the layers on top of each other to form a porous preform;aligning the pores of the layers arranged on top of each other, wherein the pores define a plurality of channels extending continuously through the porous preform from a first side of the porous preform to a second side of the porous preform, wherein the pores are aligned such that each channel extends orthogonal to the layers arranged on top of each other, and such that each channel is defined by a respective set of pores and has a uniform diameter that is equal to diameters of the respective set of pores, and wherein each channel comprises one inlet at the first side of the porous preform and one outlet at the second side of the porous preform; andinfiltrating the porous preform with a matrix material.26-. (canceled)7. The method of claim 1 , wherein the infiltrating the channels with the matrix ...

Uniformity of fiber spacing in cmc materials

A pliable tape is generally provided that includes: a plurality of fibers forming unidirectional arrays of tows encased within a matrix material, with four adjacent fibers in the tape define an interstitial spacing therebetween. The matrix material comprises filler particles dispersed between adjacent fibers in the tape. In one embodiment, the filler particles have a median particle size defining the interstitial spacing such that the interstitial spacing is about 0.75 to about 1.1 of the median particle size. In another embodiment, the filler particles have a median particle size that is related to the surface-to-surface spacing between adjacent fibers, with the ratio of the surface-to-surface spacing between adjacent fibers and the median particle size being about 0.3:1 to about 1:1. Methods are also provided for forming a ceramic matrix composite.

UNIFORMITY OF FIBER SPACING IN CMC MATERIALS

A pre-impregnated composite tape is provided that includes: a matrix material; a plurality of fibers forming unidirectional arrays of tows encased within the matrix material; and a plurality of filler particles dispersed between adjacent fibers in the tape. The fibers have a mean fiber diameter of about 5 microns and about 40 microns, and are included within the tape at a volume fraction of about 15% and about 40%. The plurality of filler particles have a log-normal volumetric median particle size, such that the tape has a ratio of the log-normal volumetric median particle size to the mean fiber diameter that is about 0.05:1 to about 1:1. A method is also provided for forming a ceramic matrix composite. 1. A pre-impregnated composite tape , comprising:a matrix material;a plurality of fibers forming unidirectional arrays of tows encased within the matrix material, wherein the fibers have a mean fiber diameter of about 5 microns to about 40 microns, and wherein the plurality of fibers are included within the tape at a volume fraction of about 15% to about 40%; anda plurality of filler particles dispersed between adjacent fibers in the tape, wherein the plurality of filler particles have a median particle size, and wherein the tape has a ratio of the median particle size to the mean fiber diameter that is about 0.05:1 to about 1:1.2. The tape of claim 1 , wherein the ratio of the median particle size of the filler powder to the mean fiber diameter is about 0.07:1 to about 0.7:1.3. The tape of claim 1 , wherein the ratio of the median particle size of the filler powder to the fiber diameter is about 0.1:1 to about 0.5:1.4. The tape of claim 1 , wherein the filler powder comprises SiC particles claim 1 , carbon particles claim 1 , boron particles claim 1 , BC particles claim 1 , SiNparticles claim 1 , MoSiparticles claim 1 , MoSiparticles claim 1 , silicide particles claim 1 , oxide particles claim 1 , polymer particles claim 1 , or a mixture thereof5. The tape of claim ...

Thermal Insulation

The present invention relates to inorganic fibres having a composition comprising: 65.7 to 70.8 wt % SiO 2 ; 27.0 to 34.2 wt % CaO; 0.10 to 2.0 wt % MgO; and optional other components providing the balance up to 100 wt %, wherein the sum of SiO 2 and CaO is greater than or equal to 97.8 wt %; and the other components, when present, comprise no more than 0.80 wt % Al 2 O 3 ; and wherein the amount of MgO and other components are configured to inhibit the formation of surface crystallite grains upon heat treatment at 1100° C. for 24 hours, wherein said surface crystallite grains comprise an average crystallite size in a range of from 0.0 to 0.90 μm.

CERAMIC MATRIX COMPOSITE ARTICLES AND METHODS FOR FORMING SAME

A ceramic matrix composite article includes a melt infiltration ceramic matrix composite substrate comprising a ceramic fiber reinforcement material in a ceramic matrix material having a first free silicon proportion, and a melt infiltration ceramic matrix composite outer layer comprising a ceramic fiber reinforcement material in a ceramic matrix material having a second free silicon proportion disposed on an outer surface of at least a portion of the substrate, or a polymer impregnation and pyrolysis ceramic matrix composite outer layer comprising a ceramic fiber reinforcement material in a ceramic matrix material having a second free silicon proportion disposed on an outer surface of at least a portion of the substrate. The second free silicon proportion is less than the first free silicon proportion. 1. A ceramic matrix composite article , comprising:a melt infiltration ceramic matrix composite substrate comprising a ceramic fiber reinforcement material in a ceramic matrix material having a first free silicon proportion; anda melt infiltration ceramic matrix composite outer layer comprising a ceramic fiber reinforcement material in a ceramic matrix material having a second free silicon proportion disposed on an outer surface of at least a portion of said substrate, or a polymer impregnation and pyrolysis ceramic matrix composite outer layer comprising a ceramic fiber reinforcement material in a ceramic matrix material having a second free silicon proportion disposed on an outer surface of at least a portion of said substrate; andwherein said second free silicon proportion being less than said first free silicon proportion.2. The ceramic matrix composite article of claim 1 , wherein said substrate comprises generally silicon carbide and free silicon claim 1 , and said outer layer comprises generally pure silicon carbide.3. The ceramic matrix composite article of claim 1 , wherein said substrate comprises generally silicon carbide and free silicon claim 1 , and ...

COMPOSITION AND METHOD TO FORM DISPLACEMENTS FOR USE IN METAL CASTING

A method to form a displacement includes disposing a powder blend (comprising a plurality of ground ceramic particles and a plurality of ground resin particles) into a mold, densifying the powder blend while in the mold, heating the mold to form a first displacement, impregnating said first displacement with a polymer precursor compound to form a second displacement, and heating the second displacement to form a third displacement. 1. A method for forming a displacement for a metallic casting , the method comprising:disposing a powder blend into a mold, the powder blend comprising a plurality of ground ceramic particles and a plurality of ground resin particles;densifying said powder blend while in said mold;heating said mold to form a first displacement;impregnating said first displacement with a polymer precursor compound to form a second displacement; andheating said second displacement at about 1000° C. for about 24 hours to form a third displacement.2. The method of claim 1 , wherein said impregnating comprises:immersing said first displacement in a liquid mixture comprising said polymer precursor compound;monitoring a weight increase of said first displacement;when a weight of said first displacement no longer increases with time, determining that said second displacement is formed.3. The method of claim 1 , further comprising:heating said first displacement at about 1000° C. for about 24 hours before the impregnating said first displacement with the polymer precursor compound to form the second displacement.4. The method of claim 1 , wherein the disposing includes disposing the power blend comprising the plurality of ground ceramic particles with a maximum dimension claim 1 , of a ground ceramic particle claim 1 , of less than about 150 microns.5. The method of claim 1 , wherein the disposing includes disposing the power blend comprising the plurality of ground resin particles with a maximum dimension claim 1 , of a ground resin particle claim 1 , of less ...

CRYSTALLINE SILICA FREE LOW BIOPERSISTENCE INORGANIC FIBER

An inorganic fiber containing silica, alumina, one or more alkali metal oxides, and one or more of alkaline earth metal oxides, transition metal oxides, or lanthanide series metal oxides. The inorganic fiber exhibits good thermal performance at use temperatures of 1260° C. and greater, retains mechanical integrity after exposure to the use temperatures, is free of crystalline silica upon devitrification, is alkali flux resistant, exhibits low bio-persistence in an acidic medium, and exhibits low dissolution in a neutral medium. Also provided are thermal insulation products incorporating the inorganic fibers, a method for preparing the inorganic fiber and a method of thermally insulating articles using thermal insulation prepared from the inorganic fibers. 1. An inorganic fiber comprising the fiberization product of(i) 15 to 50 mol percent silica;(ii) 10 to 28 mol percent alumina;(iii) 16.7 to 35 mol percent of an alkali metal oxide; and(iv) 15 to 35 mol percent of at least one transition metal oxide, at least lanthanide series metal oxide, or combinations thereof;wherein the amount of silica+alumina+alkali metal oxide is 80 mol percent or less;wherein a molar ratio of alkali metal oxide to the alumina is from 1.25 to 2;wherein the amount of alumina+alkali metal oxide is 30 mol percent or greater; andwherein the inorganic fiber exhibits a linear shrinkage after exposure to 1260 ° C. for 24 hours of 5% or less.2. The inorganic fiber of claim 1 , wherein said fiber does not exhibit crystalline silica phase as measured by x-ray diffraction (XRD) after exposure to 1260° C. for 24 hours.3. The inorganic fiber of claim 2 , wherein said inorganic fiber exhibits a 6 hour dissolution rate in an acidic medium that is greater than the 6 hour dissolution rate in a neutral or near neutral medium.4. The inorganic fiber of claim 1 , wherein the alkali metal oxide comprises dipotassium oxide.5. The inorganic fiber of claim 1 , wherein the amount of alumina+alkali metal oxide is 34 ...

BUNDLED YARN, HYDRAULIC COMPOSITION AND MOLDED BODY

The present invention relates to a bundled yarn, comprising plural fibers integrated by a sizing agent, wherein the sizing agent is a modified polyvinyl alcohol comprising a structural unit (X) derived from an unsaturated carboxylic acid or derivative thereof in an amount of 0.1 to 10% by mole, taking the amount of all monomer units as 100% by mole, which modified polyvinyl alcohol has a saponification degree of 85% by mole or higher. 1. A bundled yarn , comprising plural fibers integrated by a sizing agent ,wherein the sizing agent is a modified polyvinyl alcohol comprising a structural unit (X) derived from an unsaturated carboxylic acid or derivative thereof in an amount of 0.1 to 10% by mole, taking an amount of all monomer units as 100% by mole, which modified polyvinyl alcohol has a saponification degree of 85% by mole or higher.2. The bundled yarn according to claim 1 , wherein the modified polyvinyl alcohol has a viscosity-average polymerization degree of 100 to 5 claim 1 ,000.3. The bundled yarn according to claim 1 , wherein the saponification degree of the modified polyvinyl alcohol is 88 to 100% by mole.4. The bundled yarn according to claim 1 , wherein the unsaturated carboxylic acid or derivative thereof is at least one selected from the group consisting of a (meth)acrylic acid claim 1 , a (meth)acrylic acid alkyl ester claim 1 , and a (meth)acrylic acid metal salt.6. The bundled yarn according to claim 5 , wherein a molar amount ratio (X1/(X1+X2)) of the structural unit represented by Formula (X1) with respect to a total molar amount of the structural unit represented by Formula (X1) and the structural unit represented by Formula (X2) in the modified polyvinyl alcohol is 0.65 to 1.0.7. The bundled yarn according to claim 1 , wherein the plural fibers are polyvinyl alcohol fibers.8. The bundled yarn according to claim 1 , wherein the plural fibers have an average fiber diameter of 3 to 900 μm.9. The bundled yarn according to claim 1 , wherein the ...

Inorganic nanofiber and method for manufacturing same

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

Composite Articles Comprising Metal Carbide Fibers

A method of producing, from a continuous or discontinuous (e.g., chopped) carbon fiber, partially to fully converted metal carbide fibers. The method comprises reacting a carbon fiber material with at least one of a metal or metal oxide source material at a temperature greater than a melting temperature of the metal or metal oxide source material (e.g., where practical, at a temperature greater than the vaporization temperature of the metal or metal oxide source material). Additional methods, various forms of carbon fiber, metal carbide fibers, and articles including the metal carbide fibers are also disclosed. 1. An article comprising:metal carbide fibers dispersed in a matrix, the metal carbide fibers comprising metal carbide in fiber form, the metal carbide comprising at least one of aluminum carbide, beryllium carbide, calcium carbide, cerium carbide, chromium carbide, dysprosium carbide, erbium carbide, europium carbide, gadolinium carbide, hafnium carbide, holmium carbide, iron carbide, lanthanum carbide, lithium carbide, magnesium carbide, manganese carbide, molybdenum carbide, niobium carbide, neodymium carbide, praseodymium carbide, samarium carbide, scandium carbide, tantalum carbide, terbium carbide, thulium carbide, thorium carbide, titanium carbide, tungsten carbide, uranium carbide, vanadium carbide, ytterbium carbide, yttrium carbide, or zirconium carbide.2. The article of claim 1 , wherein the matrix comprises at least one of a ceramic material claim 1 , a refractory carbide material claim 1 , a metal material claim 1 , a polymer material claim 1 , or combinations thereof.3. The article of claim 1 , wherein the article is one of claim 1 , or a portion of an article selected from the group comprising a magnet claim 1 , laser claim 1 , maser claim 1 , recording device claim 1 , electrical motor claim 1 , chemical reducing agent claim 1 , ceramic capacitor claim 1 , battery electrode claim 1 , hydrogen storage device claim 1 , mercury vapor lamp claim 1 ...

METHOD OF DEPOSITING NANOSCALE MATERIALS WITHIN A NANOFIBER NETWORK AND NETWORKED NANOFIBERS WITH COATING

Provided herein is a method of manufacturing a nanoscale coated network, which includes providing nanofibers, capable of forming a network in the presence of a liquid vehicle and providing a nanoscale solid substance in the presence of the liquid vehicle. The method may also include forming a network of the nanofibers and the nanoscale solid substance and redistributing at least a portion of the nanoscale solid substance within the network to produce a network of nanofibers coated with the nanoscale solid substance. Also provided herein is a nanoscale coated network with an active material coating that is redistributed to cover and electrochemically isolate the network from materials outside the network. 18-. (canceled)9. A method of coating a network , comprising:providing a network of nanofibers in the presence of a liquid vehicle;providing a nanoscale solid substance on or in the network; andredistributing at least a portion of the nanoscale solid substance within the network.10. The method of claim 9 , wherein the providing the network of nanofibers comprises providing a network of carbon nanotubes.11. The method of claim 9 , wherein the providing the network of nanofibers comprises: providing a dispersion of carbon nanotubes in a liquid vehicle; and', 'removing the liquid vehicle to provide a conductive network of carbon nanotubes as the network of nanofibers., 'forming a conductive network of carbon nanotubes by12. The method of claim 9 , coating one or more carbon nanotubes with nanoscale solid substance to form one or more coated carbon nanotubes;', 'providing non-coated carbon nanotubes, and, 'providing a conductive network of one or more carbon nanotubes in electrical contact with one or more other carbon nanotubes comprises, 'wherein the providing the network of nanofibers comprises 'redistributing at least a portion of the nanoscale solid substance by moving nanoscale solid substance from the one or more coated carbon nanotubes to the non-coated carbon ...

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.

HIGH STRENGTH CERAMIC FIBERS AND METHODS OF FABRICATION

A method and apparatus for forming a plurality of fibers from (e.g., CVD) precursors, including a reactor adapted to grow a plurality of individual fibers; and a plurality of independently controllable lasers, each laser of the plurality of lasers growing a respective fiber. A high performance fiber (HPF) structure, including a plurality of fibers arranged in the structure; a matrix disposed between the fibers; wherein a multilayer coating is provided along the surfaces of at least some of the fibers with an inner layer region having a sheet-like strength; and an outer layer region, having a particle-like strength, such that any cracks propagating toward the outer layer from the matrix propagate along the outer layer and back into the matrix, thereby preventing the cracks from approaching the fibers. A method of forming an interphase in a ceramic matrix composite material having a plurality of SiC fibers, which maximizes toughness by minimizing fiber to fiber bridging, including arranging a plurality of SiC fibers into a preform; selectively removing (e.g., etching) silicon out of the surface of the fibers resulting in a porous carbon layer on the fibers; and replacing the porous carbon layer with an interphase layer (e.g., Boron Nitride), which coats the fibers to thereby minimize fiber to fiber bridging in the preform. 1. A high performance fiber (HPF) structure , comprising:a plurality of fibers arranged in the structure;a matrix disposed between the fibers; an inner layer region having a sheet-like strength;', 'an outer layer region, having a particle-like strength, such that any cracks propagating toward the outer layer from the matrix propagate along the outer layer and back into the matrix, thereby preventing the cracks from approaching the fibers., 'wherein a multilayer coating is provided along the surfaces of at least some of the fibers, the multilayer coating including2. The structure of claim 1 , wherein the inner layer region comprises graphitic carbon ...

COMPOSITE MATERIAL BASED ON C/SIC FIBERS WITH ULTRA REFRACTORY, HIGH TENACITY AND ABLATION RESISTANT MATRIX

The present invention relates to a process for the production of fiber-reinforced composite materials with an ultra-refractory, high tenacity, high ablation resistant matrix with self-healing properties, prepared from highly sinterable slurries. The composite material is produced using techniques of infiltration and drying at ambient pressure or under vacuum, and consolidated by sintering with or without the application of gas or mechanical pressure. 1. A process for the preparation of an ultra-refractory composite ceramic material comprising:(i) preparing at least one preform comprising fibers selected from among carbon fibers, silicon carbide fibers and mixtures thereof;(ii) infiltrating the at least one preform with a ceramic suspension comprising: [{'sub': 2', '2', '2, '≥70 vol. % of an ultra-refractory ceramic component selected from among ZrB, HfB, TaB, ZrC, HfC, TaC and mixtures thereof;'}, {'sub': 2', '3', '4, '≤10 vol. %, of a sintering aid selected from among ZrSi, SiNand mixtures thereof; and'}, '≤20 vol. %, of a Si compound selected from SiC, at least one organic precursor of SiC and mixtures thereof; and, '(a) a mixture of ceramic phases comprising(b) a dispersing medium selected from water, at least one organic solvent and mixtures thereof, thereby obtaining a composite material;{'sup': '5', '(iii) drying the composite material at a pressure less than or equal to about 1×10Pa; and'}(iv) consolidating the dried composite material at a temperature comprised in the range of 1700°−2000° C.2. The process according to claim 1 , wherein the fibers are carbon fibers.3. The process according to claim 1 , wherein the fibers are present in the ultra-refractory composite ceramic material in an amount comprised in the range of 30-70 vol. %.4. The process according to claim 1 , wherein the mixture of ceramic phases comprises ZrB.5. The process according to claim 1 , wherein the ultra-refractory ceramic component of step (ii) is a powder having a particle size ≤5 μm. ...

Methods for producing metal-coated carbon material and carbon-metal composite material using the same

Methods for producing a transition-metal-coated carbon material having a transition metal coating which has a high adhesion strength between the transition metal and the carbon material, and which is neither exfoliated nor detached in subsequent processing are provided. The transition-metal-coated carbon material may be obtained by adhering a compound containing transition metal ions onto a surface of a carbon material and by reducing the transition metal ions with carbon in the carbon material by a heat treatment, thereby to form elemental transition metal. Here, the transition metal is Fe, Co, Ni, Mn, Cu or Zn. Moreover, also provided is a carbon-metal composite material exhibiting an excellent mechanical strength and thermal conductivity, by improving affinity with a metal such as aluminium by use of the transition-metal-coated carbon material.

GRAPHENIC FIBERS, YARNS, COMPOSITES, AND METHODS OF MAKING THE SAME

Provided in certain embodiments are high performance graphene fibers and yarns, including components and precursors thereof, and composites comprising the same. Also provided herein are methods of manufacturing such fibers, yarns, composites, and components/precursors thereof. 1. A graphenic yarn comprising a plurality of bundled fibers , the plurality of bundled fibers comprising at least one graphenic fiber comprising one or more graphenic components , the graphenic fiber having an average thickness , the one or more of graphenic components having an average length and an average width , the average length being greater than the average width.2. The graphenic yarn of claim 1 , wherein the average length of the graphenic component is about 20 micron or more.3. A graphenic fiber comprising one or more graphenic components claim 1 , the one or more of graphenic components having an average length and an average width claim 1 , the average length being greater than the average width claim 1 , and the average length of the graphenic component being about 20 micron or more.4. A graphenic fiber comprising a graphenic component claim 1 , the graphenic fiber having an average thickness claim 1 , the graphenic component having a length and a width claim 1 , the ratio of the length to the width being at least 100 claim 1 , and the width of the of graphenic component being about 10 micron or more.5. The graphenic fiber or yarn of any one of the preceding claims claim 1 , wherein the one or more graphenic component has an average width of about 10 micron or more.6. The graphenic fiber or yarn of any one of the preceding claims claim 1 , wherein the one or more graphenic component has an average width of about 20 micron or more.7. The graphenic fiber or yarn of any one of the preceding claims claim 1 , wherein the one or more graphenic component has an average length of about 1 mm or more.8. The graphenic fiber or yarn of any one of the preceding claims claim 1 , wherein the ...

Single Phase Fiber Reinforced Ceramic Matrix Composites

Ceramic composite materials that are reinforced with carbide fibers can exhibit ultra-high temperature resistance. For example, such materials may exhibit very low creep at temperatures of up to 2700° F. (1480° C.). The present composites are specifically engineered to exhibit matched thermodynamically stable crystalline phases between the materials included within the composite. In other words, the reinforcing fibers, a debonding interface layer disposed over the reinforcing fibers, and the matrix material of the composite may all be of the same crystalline structural phase (all hexagonal), for increased compatibility and improved properties. Such composite materials may be used in numerous applications. 1. A composite comprising matched crystalline phases within the constituents of the composite , the composite comprising:reinforcing hexagonal carbide fibers within a matrix of a hexagonal material, wherein the reinforcing hexagonal carbide fibers include a hexagonal interface coating disposed over the reinforcing hexagonal carbide fibers, such that the hexagonal interface coating, the hexagonal carbide fibers, and the hexagonal material of the matrix all include hexagonal phase structures.2. The composite of claim 1 , wherein the reinforcing hexagonal carbide fibers comprise alpha silicon carbide fibers claim 1 , the alpha silicon carbide having a hexagonal phase structure.3. The composite of claim 1 , wherein the hexagonal interface coating comprises hexagonal boron nitride.4. The composite of claim 1 , wherein the hexagonal interface coating comprises at least one of hexagonal boron nitride claim 1 , hexagonal aluminum nitride claim 1 , or hexagonal molybdenum nitride.5. The composite of claim 1 , wherein the hexagonal material of the matrix comprises a hexagonal carbide material and/or a hexagonal nitride material.6. The composite of claim 1 , wherein the hexagonal material of the matrix comprises alpha silicon carbide having a hexagonal phase structure.7. The ...

Oxidized Carbon Nanotube Structures

Provided are oxidized carbon nanotube structures including aggregates, networks, assemblages, rigid porous structures, electrodes, and mats. Oxidized carbon nanotubes may be formed by conducting gas-phase oxidation on carbon nanotubes. Gas-phase oxidation may be conducted by contacting carbon nanotubes with gas-phase oxidizing agents, such as CO 2 , O 2 , steam, N 2 O, NO, NO 2 , O 3 , ClO 2 , and mixtures thereof. Near critical and supercritical water can also be used as oxidizing agents. Oxidized carbon nanotube structures may include a plurality of oxidized carbon nanotubes along with a supported catalyst, which was used to grow carbon nanotubes prior to oxidation. The supported catalyst may be subjected to gas-phase oxidation and may remain with the oxidized carbon nanotubes in oxidized carbon nanotube structures.

Non-woven micro-trellis fabrics and composite or hybrid-composite materials reinforced therewith

A non-woven fabric is provided which includes a three-dimensional array of fibers. The three-dimensional array of fibers includes an array of standing fibers extending perpendicular to a plane of the non-woven fabric and attached to a base substrate, where the base substrate is one or more of an expendable film substrate, a metal base substrate, or a mandrel substrate. Further, the three-dimensional array of fibers includes multiple layers of non-woven parallel fibers running parallel to the plane of the non-woven fiber in between the array of standing fibers in a defined pattern of fiber layer orientations. In implementation, the array of standing fibers are grown to extend from the base substrate using laser-assisted chemical vapor deposition (LCVD).

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.

METHODS TO FABRICATE NEEDLED PREFORMS WITH RANDOMLY ORIENTED SHORT LENGTH CARBON FIBERS

A method and apparatus for fabricating a short length carbon fiber preform with a through thickness reinforcement is disclosed herein. The starting media for fabricating a net shape (e.g., annular disc) may meet specific requirements including a sufficient fiber volume and a binding mechanism compatible with the needle-punching process. 1. A platen comprising:a shaped heat delivery assembly, wherein the shaped heat delivery assembly is configured to deliver heat to a blend of a plurality of short length carbon fiber bundles and a binder material to form a partially melted net shape preform; anda pressure delivery surface configured to apply pressure to the partially melted net shape preform, wherein the partially melted net shape preform is subsequently needled.2. The platen of claim 1 , wherein the partially melted net shape preform is at least one of an annular disc shape and a section of an annular shaped disc.3. The platen of claim 1 , wherein the platen is configured to move in a direction normal to a conveying surface and in a direction of the conveying of the conveying surface. This application is a divisional of U.S. Ser. No. 14/230,246, filed Mar. 31, 2014, entitled “METHODS TO FABRICATE NEEDLED PREFORMS WITH RANDOMLY ORIENTED SHORT LENGTH CARBON FIBERS,” which is hereby incorporated by reference in its entirety.This disclosure generally relates to textile preparation, and more particularly, to systems and methods associated with short carbon fibers preforming.Carbon/carbon (“C/C”) parts are employed in various industries. An exemplary use for C/C parts includes using the parts as friction disks such as aircraft brake disks, race car brake disks, clutch disks, and the like. C/C brake disks are especially useful in such applications because of the superior high temperature characteristics of C/C material. In particular, the C/C material used in C/C parts is a good conductor of heat, and thus, is able to dissipate heat away from the braking surfaces that is ...

Ceramic composition and method of making the composition

A method of making a ceramic composite comprises forming a wet ceramic composition comprising a plurality of discrete ceramic components and a fluxing agent dissolved in a solvent. At least a portion of the solvent is removed from the wet ceramic composition to form a dried ceramic composition comprising the plurality of discrete ceramic components coated with the fluxing agent. The dried ceramic composition is sintered to form the ceramic composite, the sintering being carried out at a sinter temperature sufficient to fuse the discrete ceramic components at bridging sites formed where two or more of the discrete ceramic components coated with fluxing agent are in physical contact.

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.

Aluminium-silicon carbide composite, and power-module base plate

To provide an aluminum-silicon carbide composite which is suitable for use as a power-module base plate. An aluminum-silicon carbide composite wherein a peripheral portion having, as a main component thereof, an aluminum-ceramic fiber composite containing ceramic fibers having an average fiber diameter of at most 20 μm and an average aspect ratio of at least 100, is provided on the periphery of a flat plate-shaped aluminum-silicon carbide composite having a plate thickness of 2 to 6 mm formed by impregnating, with a metal containing aluminum, a porous silicon carbide molded body having a silicon carbide content of 50 to 80 vol %, and wherein the proportion of the aluminum-ceramic fiber composite occupied in the peripheral portion is at least 50 area %.

FIBER COMPOSITE COMPONENT AND PRODUCTION METHOD

A method for producing a fiber composite component and a fiber composite component for high-temperature applications. In particular, a workpiece carrier for providing and handling workpieces in high-temperature furnaces for high-temperature treatments or the like, a dimensionally stable green body of the fiber composite component being realized from a matrix material reinforced with fibers, said fiber composite component being realized by means of a heat treatment of the green body, a fiber being extruded together with a slip as a matrix material from a nozzle and being spatially arranged in such a manner that the green body is realized by means of additive manufacturing. 21. A fiber composite component for high-temperature applications , in particular a workpiece carrier for providing and handling workpieces in high-temperature furnaces for high-temperature treatments or the like , the fiber composite component being realized from a dimensionally stable green body made from a matrix material reinforced with fibers , said fiber composite component being realized by means of a heat treatment of the green body , wherein the green body is realized by means of additive manufacturing by way of a spatial arrangement and of an extrusion of a fiber together with a slip as a matrix material from a nozzle. This application represents the national stage entry of PCT International Application No. PCT/EP2018/058005 filed Mar. 28, 2018, which claims priority of German Patent Application No. 10 2017 206 452.8, filed Apr. 13, 2017, the disclosures of which are incorporated by reference here in their entirety for all purposes.The disclosure relates to a fiber composite component as well as to a method for producing a fiber composite component for high-temperature applications, in particular a workpiece carrier for providing and handling workpieces in high-temperature furnaces for high-temperature treatments or the like, a dimensionally stable green body of the fiber composite ...

Formulations with active functional additives for 3d printing of preceramic polymers, and methods of 3d-printing the formulations

This invention provides resin formulations which may be used for 3D printing and pyrolyzing to produce a ceramic matrix composite. The resin formulations contain a solid-phase filler, to provide high thermal stability and mechanical strength (e.g., fracture toughness) in the final ceramic material. The invention provides direct, free-form 3D printing of a preceramic polymer loaded with a solid-phase filler, followed by converting the preceramic polymer to a 3D-printed ceramic matrix composite with potentially complex 3D shapes or in the form of large parts. Other variations provide active solid-phase functional additives as solid-phase fillers, to perform or enhance at least one chemical, physical, mechanical, or electrical function within the ceramic structure as it is being formed as well as in the final structure. Solid-phase functional additives actively improve the final ceramic structure through one or more changes actively induced by the additives during pyrolysis or other thermal treatment.

CARBONACEOUS METAL/CERAMIC NANOFIBERS

Provided herein are nanofibers and processes of preparing carbonaceous nanofibers. In some embodiments, the nanofibers are high quality, high performance nanofibers, highly coherent nanofibers, highly continuous nanofibers, or the like. In some embodiments, the nanofibers have increased coherence, increased length, few voids and/or defects, and/or other advantageous characteristics. In some instances, the nanofibers are produced by electrospinning a fluid stock having a high loading of nanofiber precursor in the fluid stock. In some instances, the fluid stock comprises well mixed and/or uniformly distributed precursor in the fluid stock. In some instances, the fluid stock is converted into a nanofiber comprising few voids, few defects, long or tunable length, and the like. 1. A plurality of nanofibers comprising a polymer component and a metal component , the metal component comprising a ceramic , a ceramic precursor , or a combination thereof , and the plurality of nanofiber comprising at least one weight part metal component for every one part polymer component.2. The plurality of nanofibers of claim 1 , wherein the metal of the metal component is selected from the group consisting of Ag claim 1 , Cu claim 1 , Ni claim 1 , Fe claim 1 , Co claim 1 , Pb claim 1 , Au claim 1 , Sn claim 1 , Al claim 1 , Zr claim 1 , Mn claim 1 , Be claim 1 , Cd claim 1 , Si claim 1 , Ti claim 1 , V claim 1 , Hf claim 1 , Sr claim 1 , Ba claim 1 , Ge claim 1 , and combinations thereof.3. The plurality of nanofibers of claim 2 , wherein the plurality of nanofibers comprises the ceramic claim 2 , and the ceramic is selected from the group consisting of AlO claim 2 , ZrO claim 2 , FeO claim 2 , CuO claim 2 , NiO claim 2 , ZnO claim 2 , CdO claim 2 , SiO claim 2 , TiO claim 2 , VO claim 2 , VO claim 2 , FeO claim 2 , SnO claim 2 , SnO claim 2 , CoO claim 2 , CoO claim 2 , CoO claim 2 , HfO claim 2 , BaTiO claim 2 , SrTiO claim 2 , and BaSrTiO.4. The plurality of nanofibers of claim 2 , ...

INORGANIC FIBER

An inorganic fiber containing silica and magnesia as the major fiber components and which further includes an intended iron oxide additive to improve the dimensional stability of the fiber. The inorganic fiber exhibits good thermal insulation performance at 1400° C. and greater, retains mechanical integrity after exposure to the use temperature, and which remains non-durable in physiological fluids. Also provided are thermal insulation product forms comprising a plurality of the inorganic fibers, methods of preparing the inorganic fiber and of thermally insulating articles using thermal insulation prepared from a plurality of the inorganic fibers. 1. An inorganic fiber comprising a fiberization product of about 70 weight percent or greater silica , magnesia , and greater than 5 to about 10 weight percent iron oxide , measured as FeO , wherein said inorganic fiber exhibits a shrinkage of 10% or less at 1400° C. for 24 hours.2. The inorganic fiber of claim 1 , wherein said inorganic fiber has an average diameter of greater than 4 microns.3. The inorganic fiber of claim 2 , wherein said inorganic fiber exhibits a shrinkage of 5% or less at 1400° C. for 24 hours.4. The inorganic fiber of claim 3 , wherein said inorganic fiber exhibits a shrinkage of 4% or less at 1400° C. for 24 hours.5. The inorganic fiber of claim 1 , wherein said inorganic fiber comprises the fiberization product of about 70 to about 80 weight percent silica claim 1 , about 15 to less than 25 weight percent magnesia claim 1 , and greater than 5 to about 10 weight percent iron oxide claim 1 , measured as FeO.6. The inorganic fiber of claim 5 , wherein said inorganic fiber comprises the fiberization product of about 70 to about 80 weight percent silica claim 5 , about 15 to about 25 weight percent magnesia claim 5 , greater than 5 to about 10 weight percent iron oxide claim 5 , measured as FeO claim 5 , and 1 weight percent or less calcia.7. The inorganic fiber of claim 5 , wherein said inorganic fiber ...

Method for Producing Inorganic Fiber-Bonded Ceramic Material

Provided is a method for producing an inorganic fiber-bonded ceramic material, which can produce, at a high yield, an inorganic fiber-bonded ceramic material with fewer defects, and with an end part and a central part equivalent to each other in microstructure and mechanical properties, and also makes it possible to increase the ceramic material in size. The method for producing an inorganic fiber-bonded ceramic material is characterized in that it includes: a first pressing step of setting, in a carbon die, a laminate to be surrounded by a ceramic powder, the laminate obtained by stacking a coated inorganic fiber shaped product including an inorganic fiber part of inorganic fibers that have a pyrolysis initiation temperature of 1900° C. or lower, and a surface layer of an inorganic substance for bonding the inorganic fibers to each other, and pressing the laminate at a temperature of 1000 to 1800° C. and a pressure of 5 to 50 MPa in an inert gas atmosphere; and a second pressing step of pressing a ceramic coated laminate obtained in the first pressing step at a temperature of 1600 to 1900° C., which is higher than that in the first pressing step, and at a pressure of 5 to 100 MPa in an inert gas atmosphere.

CONTINUOUS MULTIPLE TOW COATING REACTOR

A tow coating reactor system includes a reactor for receiving fiber tow, a wedge situated adjacent the reactor and configured to receive the tow at a tip end, such that as the tow moves across the wedge, the wedge spreads the tow into a plurality of sub-tows. 1. A tow coating reactor system comprising:a reactor for receiving fiber tow; anda wedge situated adjacent the reactor and configured to receive the tow at a tip end, such that as the tow moves across the wedge, the wedge spreads the tow into a plurality of sub-tows, wherein the wedge includes a plurality of longitudinal grooves, each of the plurality of longitudinal grooves configured to receive one of the plurality of sub-tows, and the wedge includes a plurality of fins within each of the plurality of longitudinal grooves.2. The tow-coating reactor system as recited in claim 1 , wherein the wedge includes a tapered portion including a tip in line with the fiber tow.3. The tow-coating reactor system as recited in claim 2 , wherein the wedge includes an untapered portion downstream of the tapered portion.4. The tow-coating reactor system as recited in claim 1 , wherein the wedge has a coating.5. The tow-coating reactor system as recited in claim 4 , wherein the coating is a diamond-like carbon coating.6. The tow-coating reactor system as recited in claim 1 , wherein the fiber tow has a tow center axis claim 1 , the wedge having a wedge center axis claim 1 , and the tow center axis and the wedge center axis are aligned.7. The tow-coating reactor system as recited in claim 1 , wherein the wedge includes a first half surface and a second half surface opposite the first half surface claim 1 , and the wedge is positioned such that one of the plurality of sub-tows runs across the first half surface claim 1 , and a second of the plurality of sub-tows runs across the second half surface.8. The tow-coating reactor system as recited in claim 1 , comprising a second wedge opposite the reactor from the first wedge.9. The ...

Article having ceramic wall with flow turbulators

An article includes a ceramic wall that defines at least a side of a passage. The ceramic wall includes a flow turbulator that projects into the passage. The flow turbulator is formed of ceramic matrix composite.

Nerve repair conduits incorporating silica fibers

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

Ceramic matrix composite turbine nozzle shell and method of assembly

A ceramic matrix composite turbine nozzle includes a primary outer nozzle platform; a primary inner nozzle platform; and an airfoil-shaped body extending between the primary inner and primary outer nozzle platforms. The body includes core plies defining a cavity; composite wrap plies circumscribing the core plies and defining an airfoil shape; a secondary outer nozzle platform in contact with the primary outer nozzle platform; and a secondary inner nozzle platform in contact with the primary inner nozzle platform. Each composite wrap ply has two layers of unidirectional fibers oriented transverse to each other and has first and second longitudinal edges. The first and second longitudinal edges are cut into fingers, which are folded in a transverse direction away from a turbine nozzle longitudinal axis and are interleaved between platform plies to define the secondary inner nozzle platform and the secondary outer nozzle platform.

WEAR-RESISTANT MATERIAL, LOCALLY-REINFORCED LIGHT METAL MATRIX COMPOSITES AND MANUFACTURING METHOD

A composition of the wear-resistant material of the present invention includes high-temperature resistant skeleton metal materials, ceramic fiber materials and ceramic particle materials with the mass ratio of (10-60):(1-30):(10-70). The high-temperature resistant skeleton metal materials are foam metal or high-temperature resistant metal fibers. The wear-resistant material is good in wear-resistance, high in tenacity, suitable for occasions with high requirements for wear-resistance and tenacity and capable of being locally attached to the surface of the light metal alloy matrix to improve the wear-resistance and tenacity of the light metal alloy matrix under high temperature conditions. The locally-reinforced light metal matrix composites of the present invention are the light metal alloy matrix locally-reinforced through the wear-resistant material. A manufacturing method of the locally-reinforced light metal matrix composites of the present invention is to metallurgically bond the wear-resistant layer with the light metal alloy matrix is through the squeeze casting technique. 1. A wear-resistant material , comprising high-temperature resistant skeleton metal materials , ceramic fiber materials and ceramic particle materials with the mass ratio of (10-60):(1-30):(10-70); the high-temperature resistant skeleton metal material are foam metal or high-temperature resistant metal fibers; the high-temperature resistant metal fibers comprise one or more of iron-based alloy fibers , nickel-based alloy fibers , copper-based alloy fibers , stainless steel fibers , steel wool fibers , titanium-based alloy fibers and cobalt-based alloy fibers; the ceramic fiber materials comprise one or more of alumina fibers , alumina silicate fibers , silicon dioxide fibers , zirconium oxide fibers , silicon carbide fibers , graphite fibers and carbon fibers; the ceramic particle materials comprise one or more of flyash particles , superfine slag powder particles , silicon carbide ...

Silica fiber compositions and methods of use

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

Monomer formulations and methods for 3d printing of preceramic polymers

This invention provides resin formulations which may be used for 3D printing and pyrolyzing to produce a ceramic matrix composite. The resin formulations contain a solid-phase filler, to provide high thermal stability and mechanical strength (e.g., fracture toughness) in the final ceramic material. The invention provides direct, free-form 3D printing of a preceramic polymer loaded with a solid-phase filler, followed by converting the preceramic polymer to a 3D-printed ceramic matrix composite with potentially complex 3D shapes or in the form of large parts. Other variations provide active solid-phase functional additives as solid-phase fillers, to perform or enhance at least one chemical, physical, mechanical, or electrical function within the ceramic structure as it is being formed as well as in the final structure. Solid-phase functional additives actively improve the final ceramic structure through one or more changes actively induced by the additives during pyrolysis or other thermal treatment.

A process for producing a three-dimensional green body by a fused filament fabrication (fff) process

The invention relates to a process for producing a three-dimensional green body by a fused filament fabrication process employing at least one filament, which comprises a core material (CM) coated with a layer of a shell material (SM), and a three-dimensional extrusion printer (3D printer). The three-dimensional extrusion printer 0 contains at least one nozzle and at least one mixing element. The invention further relates to three-dimensional objects and an extruded strand obtained by the process.

Inorganic fiber with improved shrinkage and strength

An inorganic fiber containing silica and magnesia as the major fiber components which further includes intended lithium oxide and strontium oxide additions to improve the thermal stability of the fiber. The inorganic fiber exhibits good thermal performance at 1260° C. and greater, retains mechanical integrity after exposure to the use temperature, and exhibits low biopersistence in physiological fluids. Also provided are thermal insulation product forms, methods of preparing the inorganic fiber and of thermally insulating articles using thermal insulation prepared from a plurality of the inorganic fibers.

SIC/ZRC COMPOSITE FIBER, PREPARATION METHOD AND USE THEREOF

Provided are a SiC/ZrC composite fiber, a preparation method and use thereof. The SiC/ZrC composite fiber has a diameter of 10 to 70 μm. The method includes mixing liquid polycarbosilane with a zirconium-containing polymer to obtain a hybrid spinning solution, and then performing electrospinning to obtain a SiC/ZrC composite fiber precursor, crosslinking and thermally treating the SiC/ZrC composite fiber precursor in a protective atmosphere to obtain the SiC/ZrC composite fiber. The SiC/ZrC composite fiber is continuous and uniform, has an adjustable diameter, and thus has outstanding tensile strength and breaking strength and excellent high-temperature resistance. Without use of any organic solvent or spinning agent, the method achieves short process flow and high yield, indicating wide application prospects. 1. A SiC/ZrC composite fiber , wherein the SiC/ZrC composite fiber has a diameter of 10 to 70 μm.2. The SiC/ZrC composite fiber according to claim 1 , wherein the diameter of the SiC/ZrC composite fiber is 12 to 40 μm.3. A preparation method of the SiC/ZrC composite fiber according to claim 1 , comprising steps of:(1) under protection of an inert atmosphere, mixing liquid polycarbosilane with a zirconium-containing polymer to obtain a hybrid spinning solution, and performing electrospinning to obtain a SiC/ZrC composite fiber precursor; and(2) crosslinking and thermally treating the SiC/ZrC composite fiber precursor obtained in step (1) in a protective atmosphere to obtain the SiC/ZrC composite fiber.4. The preparation method according to claim 3 , wherein the zirconium-containing polymer in step (1) comprises any one of or a combination of at least two of polyzirconoxane claim 3 , zirconium acetylacetonate claim 3 , or tetraallylamine zirconium.5. The preparation method according to claim 3 , wherein a mass ratio of the liquid polycarbosilane to the zirconium-containing polymer in step (1) is (1-5):1.6. The preparation method according to claim 3 , wherein ...

Low-thickness thermostructural composite material part, and manufacture method

A thermostructural composite material part including carbon or ceramic fiber reinforcement densified by a matrix having at least one thin portion in which: the thickness of the part is less than 2 mm, or indeed less than 1 mm; the fiber reinforcement is made as a single thickness of multilayer fabric made of spread yarns having a weight of not less than 200 tex; the fiber volume ratio lies in the range 25% to 45%; and the ratio between the number of layers of the multilayer fabric and the thickness in millimeters of the part is not less than four.

Ceramic Composite Structures and Processing Technologies

Methods, systems, and processes are used to prepare novel ceramic composite structures that are strong, durable, light-weight, high performance and suitable for a myriad of industrial applications, including, but not limited to, ceramic plates of material suitable for use as ballistic armor. The low manufacturing costs of the processes disclosed provide cheaper, faster ways of producing ceramic matrix composites at lower temperatures and allow for the existence of composite materials and structures which currently are not available.

Method of making a fiber preform for ceramic matrix composite (cmc) fabrication utilizing a fugitive binder

A method of making a fiber preform for ceramic matrix composite (CMC) fabrication comprises laminating an arrangement of fibers between polymer sheets comprising an organic polymer, which may function as a fugitive binder during fabrication, to form a flexible prepreg sheet. A plurality of the flexible prepreg sheets are laid up in a predetermined geometry to form a stack, and the stack is heated to soften the organic polymer and bond together the flexible prepreg sheets into a bonded prepreg structure. Upon cooling of the bonded prepreg structure, a rigid preform is formed. The rigid preform is heated at a sufficient temperature to pyrolyze the organic polymer. Thus, a porous preform that may undergo further processing into a CMC is formed.

METHOD FOR FABRICATING A CERAMIC MATERIAL

A ceramic article includes a ceramic matrix composite that has a porous reinforcement structure and a ceramic matrix within pores of the porous reinforcement structure. The ceramic matrix composite includes a surface zone comprised of an exterior surface of the ceramic matrix composite and pores that extend from the exterior surface into the ceramic matrix composite. A glaze material seals the surface zone within the pores of the surface zone and on the exterior surface of the surface zone as an exterior glaze layer on the ceramic matrix composite. The glaze material is a glass or glass-ceramic material. The ceramic matrix composite includes an interior zone under the surface zone, and the interior zone is free of any of the glaze material and has a greater porosity than the surface zone. 1. A ceramic article comprising:a ceramic matrix composite including a porous reinforcement structure and a ceramic matrix within pores of the porous reinforcement structure, the ceramic matrix composite including a surface zone comprised of an exterior surface of the ceramic matrix composite and pores that extend from the exterior surface into the ceramic matrix composite; anda glaze material sealing the surface zone within the pores of the surface zone and on the exterior surface of the surface zone as an exterior glaze layer on the ceramic matrix composite, wherein the glaze material is a glass or glass-ceramic material, and the ceramic matrix composite including an interior zone under the surface zone, the interior zone being free of any of the glaze material and having a greater porosity than the surface zone.2. The ceramic article as recited in claim 1 , wherein the glaze material includes borosilicate glass (BSG) of composition claim 1 , by weight claim 1 , boron oxide claim 1 , BO claim 1 , 10-30%; aluminum oxide claim 1 , AlO claim 1 , 0-4%; sodium oxide claim 1 , NaO claim 1 , 0-8%; and silicon dioxide claim 1 , SiO claim 1 , 65-85%.3. The ceramic article as recited in ...

FIBER WITH ELEMENTAL ADDITIVE(S) AND METHOD OF MAKING

A multi-composition fiber is provided including a primary fiber material and an elemental additive material deposited on grain boundaries between adjacent crystalline domains of the primary fiber material. A method of making a multi-composition fiber is also provided, which includes providing a precursor laden environment, and promoting fiber growth using laser heating. The precursor laden environment includes a primary precursor material and an elemental precursor material. 1. A method of making a multi-composition fiber , the method comprising:providing a precursor laden environment;promoting fiber growth using laser heating; andwherein the precursor laden environment comprises a primary precursor material and an elemental precursor material.2. The method of claim 1 , wherein the primary fiber material is a refractory-grade claim 1 , inorganic primary fiber material.3. The method of claim 1 , wherein the primary precursor material comprises a precursor for a material selected from a group consisting of silicon carbide claim 1 , boron carbide claim 1 , silicon nitride claim 1 , zirconium carbide claim 1 , hafnium diboride claim 1 , hafnium carbide claim 1 , tantalum carbide claim 1 , niobium carbide claim 1 , tantalum diboride claim 1 , zirconium diboride claim 1 , tungsten diboride claim 1 , hafnium nitride claim 1 , tantalum nitride claim 1 , zirconium nitride claim 1 , and combinations thereof.4. The method of claim 1 , wherein the elemental precursor material comprises a precursor for a material selected from a group consisting of hafnium claim 1 , tantalum claim 1 , niobium claim 1 , yttrium claim 1 , lanthanum claim 1 , cerium claim 1 , zirconium claim 1 , molybdenum claim 1 , tungsten claim 1 , and combinations thereof.5. The method of claim 1 , wherein the precursor laden environment comprises a material selected from a group consisting of gases claim 1 , liquids claim 1 , critical fluids claim 1 , supercritical fluids claim 1 , and combinations thereof.6. ...

Process for Producing a Silicon Carbide-Containing Body

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

Method of making ceramic nanofibers

Continuous ceramic (e.g., silicon carbide) nanofibers ( 502, 602, 604, 606, 608, 702, 704, 1102, 1104 ) which are optionally p or n type doped are manufactured by electrospinning a polymeric ceramic precursor to produce fine strands of polymeric ceramic precursor which are then pyrolized. The ceramic nanofibers may be used in a variety of applications not limited to reinforced composite materials ( 400 ), thermoelectric generators ( 600, 700 ) and high temperature particulate filters ( 1200 ).

METHOD FOR PREPARING INVERSE OPAL COLLOIDAL CRYSTAL FIBERS

The present invention discloses a method for preparing inverse opal photonic crystal fibers. In this method, by means of vertical deposition of colloidal spheres (micron scale or nanoscale), of polystyrene shell-core structured spheres and silica particles, the inverse opal colloidal crystal fiber stripes having a length of about 3.5 cm as well as an adjustable width and thickness is obtained. The invention provides a convenient method and achieves inverse opal photonic crystal fiber stripes with a high yield and a controllable size, and there is no crack on the surface of the fibers or inside the fibers. Furthermore, the inverse opal photonic crystal stripes of the invention can be peeled off from the surface of a glass slide and used conveniently. 1. A method for preparing non-crack inverse opal colloidal crystal fibers , comprising steps of:(1) forming a layer of a copolymer of methyl methacrylate (MMA) and acrylic acid (AA) on the surface of polystyrene (St) microspheres by a microemulsion method, to obtain shell-core structured P-(St-MMA-AA) microspheres with a polystyrene core;(2) uniformly mixing a 0.3%-1.0% w/v dispersion solution of the shell-core structured P-(St-MMA-AA) microspheres with silica nanoparticles by a weight ratio of 1:0.4-0.6 to form a colloidal solution, and obtaining colloidal crystal fiber stripes after vertical deposition of the colloidal solution and drying the colloidal solution in an oven under 50° C.; and(3) sintering the colloidal crystal fiber stripes in an oven under 500° C. for 2 hrs to remove the shell-core structured P-(St-MMA-AA) microspheres, to get the inverse opal colloidal crystal fibers,wherein the silica nanoparticles are irregular solid particles, and have a refractive index of 1.56;wherein the inverse opal colloidal crystal fibers have a length of about 3.5 cm and a width of 50 μm-200 μm; andwherein the inverse opal colloidal crystal fibers do not have crack on surface and in interior thereof.2. The method as claimed in ...

HIGH-MOLECULAR POLYSILANE AND METHOD FOR THE PRODUCTION THEREOF FOR PRODUCING PRE-CERAMIC MOLDED BODIES

A method produces a polysilane by reacting at least two silane monomers and at least one alkali metal. The silane monomers have the following structural units: at least one aryl group, at least one alkyl group, at least one alkenyl group, and at least three halogen atoms. Wherein at least three of the halogen atoms are bonded to a silicon atom of one of the silane monomers, and the reaction step takes place in an ether-containing solvent, particularly preferably dioxane. The obtained polysilane has a high molecular mass and, at 100° C., a viscosity of 1,500 to 3,000 Pa·s. The polysilane is very suitable for being processed to form silicon carbide fibers and fiber composites. 1. A method for producing a polysilane , which comprises the steps of: at least one aryl group;', 'at least one alkyl group;', 'at least one alkenyl group; and', 'at least three halogen atoms, at least three of the halogen atoms being bonded to a silicon atom of one of the silane monomers., 'reacting (i) at least two silane monomers and (ii) at least one alkali metal in an ether-containing solvent, the silane monomers containing the following structural units2. The method according to claim 1 , wherein ether of the ether-containing solvent contains at least two oxygen atoms.3. The method according to claim 1 , wherein the ether-containing solvent contains 50 to 100% dioxane.4. The method according to claim 1 , which further comprises using the alkali metal in an excess of at least 10% with respect to an amount of halogen in educts.5. The method according to claim 1 , which further comprises adding the alkali metal step by step in parallel with an addition of the silane monomers to a reaction mixture.6. The method according to claim 1 , which further comprises using a reaction initiator during the reacting step claim 1 , and the initiator contains the following structural units:a silicon atom;at least one halogen atom bonded to the silicon atom; andat least two sterically hindering groups bonded ...

ADDITIVE MANUFACTURING TECHNIQUE FOR PLACING NUCLEAR REACTOR FUEL WITHIN FIBERS

Nuclear fuel structures and methods for fabricating are disclosed herein. The nuclear fuel structure includes a plurality of fibers arranged in the structure and a multilayer fuel region within at least one fiber of the plurality of fibers. The multilayer fuel region includes an inner layer region made of a nuclear fuel material, and an outer layer region encasing the nuclear fuel material. A plurality of discrete multilayer fuel regions may be formed over a core region along the at least one fiber, the plurality of discrete multilayer fuel regions having a respective inner layer region of nuclear fuel material and a respective outer layer region encasing the nuclear fuel material. The plurality of fibers may be wrapped around an inner rod or tube structure or inside an outer tube structure of the nuclear fuel structure, providing both structural support and the nuclear fuel material of the nuclear fuel structure. 1. A method of forming at least part of a fiber , comprising: providing precursors in a reactor; and', 'forming nuclear fuel material as at least part of the fiber in the reactor from the precursors, including using chemical deposition interacting with said precursors to deposit the nuclear fuel material., 'forming at least part of the fiber having nuclear fuel material therein, the forming comprising2. The method of claim 1 , wherein said chemical deposition comprises laser chemical vapor deposition.3. The method of claim 2 , wherein said forming includes:providing a plurality of fibers in the reactor; andusing a laser which interacts with the plurality of fibers and the precursors to deposit the nuclear fuel material over respective portions of the plurality of fibers.4. The method of claim 2 , wherein said forming includes:growing a plurality of fibers, including using a plurality of independently controllable lasers, each laser of the plurality of lasers growing a respective fiber of the plurality of fibers.5. The method of claim 1 , wherein the ...

FRICTION MATERIAL

A friction material including two or more kinds of titanates and a ceramic fiber. The friction material includes no copper component. The two or more kinds of titanates may optionally include two or more kinds of alkali metal titanates, or the two or more kinds of titanates may optionally include an alkaline earth metal-alkali metal titanate and an alkali metal titanate. 1. A friction material comprising two or more kinds of titanates and a ceramic fiber and comprising no copper component.2. The friction material according to claim 1 , wherein the two or more kinds of titanates comprise two or more kinds of alkali metal titanates.3. The friction material according to claim 1 , wherein the two or more kinds of titanates comprise an alkaline earth metal-alkali metal titanate and an alkali metal titanate.4. The friction material according to claim 1 , wherein the two or more kinds of titanates comprise lithium potassium titanate and potassium titanate.5. The friction material according to claim 1 , wherein the two or more kinds of titanates comprise magnesium potassium titanate and potassium titanate.6. The friction material according to claim 1 , wherein the ceramic fiber has a fiber diameter of 0.1 to 10 μm claim 1 , a fiber length of 1 to 1000 μm and a shot content of 0.1 to 70% by mass.7. The friction material according to claim 1 , wherein a content of the two or more kinds of titanates in the friction material is from 3 to 40% by volume in total.8. The friction material according to claim 1 , wherein a content of the ceramic fiber in the friction material is from 1 to 6% by volume.9. The friction material according to claim 2 , wherein the two or more kinds of titanates comprise lithium potassium titanate and potassium titanate.10. The friction material according to claim 3 , wherein the two or more kinds of titanates comprise magnesium potassium titanate and potassium titanate.11. The friction material according to claim 2 , wherein the ceramic fiber has a fiber ...

CERAMIC-POLYMER HYBRID NANOSTRUCTURES, METHODS FOR PRODUCING AND APPLICATIONS THEREOF

Provided herein are methods for forming nanofibers. The current disclosure provides ceramic nanofibers, morphology-controlled ceramic-polymer hybrid nanofibers, morphology-controlled ceramic nanofibers, core-sheath nanofibers and hollow core nanofibers using ceramic precursor materials and polymer materials which are combined and undergo electrospinning. The current disclosure provides for methods of forming these nanofibers at low temperatures such as room temperature and in the presence of oxygen and moisture wherein the ceramic precursor cures to a ceramic material during the electrospinning process. Also disclosed are the nanofibers prepared by the disclosed methods. 2. The method of claim 1 , wherein within one hour of being exposed to oxygen claim 1 , water and an optional catalyst claim 1 , the electrospun product is a cured ceramic polymer hybrid nanofiber.3. The method of claim 1 , wherein the fluid stock further comprises a catalyst.4. The method of claim 3 , where the catalyst is an amine.5. The method of claim 1 , wherein the temperature of electrospinning is about 300° C. or below.6. The method of claim 5 , wherein the process of electrospinning is performed at 50° C. or below.7. The method of claim 5 , wherein the method is performed without further thermal treatment.8. The method of claim 1 , wherein the degree of curing to a ceramic of the precursor material after electrospinning is above about 75%.9. The method of claim 7 , wherein the degree of curing to a ceramic of the precursor material after electrospinning is above about 75%.10. The method of claim 1 , wherein the process of electrospinning the fluid stock is gas assisted.11. The method of claim 1 , wherein the polymer material is at least one material chosen from the group consisting of poly(ethylene oxide) claim 1 , polyamide resins claim 1 , aramid resins claim 1 , poly(meta-phenyleneisophthalamide) claim 1 , polyalkylene oxides claim 1 , polyolefins claim 1 , polyethylenes claim 1 , ...

NANOFIBER INTERLAMINAR LAYER FOR CERAMIC MATRIX COMPOSITES

A component according to an example embodiment of the present disclosure includes first and second layers, the first and second layers each including ceramic-based fibers arranged in a ceramic-based matrix material, and nanofibers arranged between the first and second layers. An alternate component and a method of forming a component are also disclosed. 1. A method of forming a component , comprising:depositing nanofibers onto at least one of first and second layers, the first and second layers each including ceramic-based fibers arranged in a ceramic-based matrix material; andbonding the first and second layers and the nanofibers to form a component.2. The method of claim 1 , further comprising arranging the first and second layers in an alternating manner with the nanofibers.3. The method of claim 1 , wherein subsequent the depositing step claim 1 , the nanofibers in the third layer cover greater than approximately 20% of a surface area of the first or second layers.4. The method of claim 1 , wherein the depositing step includes depositing nanofibers directly onto at least one of the first and second layers.5. The method of claim 4 , wherein the depositing step includes electrospinning or centrifugal spinning.6. The method of claim 1 , wherein the depositing step includes forming a fibrous mat of nanofibers independent of the first and second layers and applying the mat to at least one of the first and second layers.7. The method of claim 1 , further comprising densifying the component by at least one of chemical vapor infiltration claim 1 , preceramic polymer infiltration (PIP) claim 1 , and glass transfer molding (GTM). This application is a division of U.S. patent application Ser. No. 14/628,600, filed on Feb. 23, 2015.Composite materials, such as ceramic matrix composites (CMCs), can be utilized in high-temperature applications. CMCs may have multiple layers of fibers that are disposed in a ceramic matrix. For example, fiber layers are stacked and then ...

METHOD FOR PRODUCING SOLIDIFIED FIBER BUNDLES

A method for producing solidified fiber bundles includes applying a melt or solution to a carrier web forming a viscous coating, applying parallel filaments under tension to the carrier web, and pressing the filaments into the viscous coating, forming an impregnate. The coating is partially solidified until a plastically deformable state of the impregnate is obtained by vaporizing the solvent, thermal curing and/or cooling. The impregnate is rolled onto a winding core to form a roll while maintaining a winding tension of the filaments in the impregnate. The outer roll is fixed on the winding core by a sleeve and/or by adhesive tape. The impregnate is solidified by vaporizing the solvent, thermal curing and/or cooling. The solidified impregnate is divided up to form solidified fiber bundles. A pressure produced by the winding tension of the filaments in the impregnate is exerted on the roll. 1. A method for producing solidified fiber bundles , which comprises the steps of:a) applying a melt or solution to a sheet-shaped carrier layer, thereby forming a viscous coating;b) applying parallel filaments under tension to the sheet-shaped carrier layer having the viscous coating;c) pressing the filaments into the viscous coating, thereby forming an impregnate;d) rolling the impregnate onto a winding core to form a roll while maintaining a winding tension of the filaments in the impregnate;e) solidifying the impregnate by at least one of vaporizing a solvent, thermal curing and cooling resulting in a solidified impregnate, wherein a pressure produced by the winding tension of the filaments in the impregnate is exerted on the roll during a performance of step e); andf) dividing up the solidified impregnate for forming the solidified fiber bundles.2. The method according to claim 1 , wherein the melt is a melt of a thermoplastic plastic claim 1 , a thermosetting synthetic resin claim 1 , a pitch and/or a sugar.3. The method according to claim 1 , wherein the solution is a ...

HIGH STRENGTH CERAMIC FIBERS AND METHODS OF FABRICATION

A method and apparatus for forming a plurality of fibers from (e.g., CVD) precursors, including a reactor adapted to grow a plurality of individual fibers; and a plurality of independently controllable lasers, each laser of the plurality of lasers growing a respective fiber. A high performance fiber (HPF) structure, including a plurality of fibers arranged in the structure; a matrix disposed between the fibers; wherein a multilayer coating is provided along the surfaces of at least some of the fibers with an inner layer region having a sheet-like strength; and an outer layer region, having a particle-like strength, such that any cracks propagating toward the outer layer from the matrix propagate along the outer layer and back into the matrix, thereby preventing the cracks from approaching the fibers. A method of forming an interphase in a ceramic matrix composite material having a plurality of SiC fibers, which maximizes toughness by minimizing fiber to fiber bridging, including arranging a plurality of SiC fibers into a preform; selectively removing (e.g., etching) silicon out of the surface of the fibers resulting in a porous carbon layer on the fibers; and replacing the porous carbon layer with an interphase layer (e.g., Boron Nitride), which coats the fibers to thereby minimize fiber to fiber bridging in the preform. 1. A high performance fiber (HPF) structure , comprising:a plurality of fibers arranged in the structure;a matrix disposed between the fibers; an inner layer region having a sheet-like strength;', 'an outer layer region, having a particle-like strength, such that any cracks propagating toward the outer layer from the matrix propagate along the outer layer and back into the matrix, thereby preventing the cracks from approaching the fibers., 'wherein a multilayer coating is provided along the surfaces of at least some of the fibers, the multilayer coating including2. The structure of claim 1 , wherein the inner layer region comprises graphitic carbon ...

Ceramic matrix composite member and method of manufacturing the same

A ceramic matrix composite member used as a turbine blade includes a principal part forming a blade part and a dovetail part, and a subordinate part forming a platform part. A principal fiber in a ceramic fiber fabric forming the principal part is a continuous fiber. An extension direction of the principal fiber is in parallel with a direction in which stress is applied. The ceramic fiber fabrics respectively forming the principal part and the subordinate part are joined together and formed into an integrated three-pronged fiber fabric. The ceramic fiber fabric forming the principal part and the ceramic fiber fabric forming the subordinate part are integrated together by being set into a mold with the ceramic fiber fabric forming the subordinate part folded at a desired angle to the ceramic fiber fabric forming the principal part. Then, a ceramic matrix is formed in the obtained molded body.

Process and Formulation to Join Ceramic Forms While Maintaining Structural and Physical Characteristics Across The Bond Surface

A ceramic bonding material including at least one fibrous material, a flux agent and a thickening agent wherein the ceramic bonding material fired at a set temperature to bond the two adjacent substrate faces. 1. A method for forming a cured ceramic structure comprising the steps of:(a) applying a bonding material to at least one bonding surface selected from a first bonding surface of a first substrate piece and a second bonding surface of a second substrate piece wherein the bonding material further comprises a fibrous material, a fluxing agent and a thickening agent wherein the fibrous material has a CTE that is substantially similar to the CTE of at least one of the first and second substrates;(b) joining the first bonding surface and the second bonding surface such that the bonding material is positioned between the first bonding surface and the second bonding surface to form a ceramic structure including an uncured bonding material; and(c) heating the ceramic structure at a temperature of from about 1,000° C. to about 1,600° C. for a time sufficient to form a ceramic structure including a cured bonding material.2. The method of wherein at least one bonding surface is pretreated to form a pretreated bonding surface after which the bonding material is applied to the pretreated bonding surface.3. The method of wherein steps (a) and (b) are repeated to form a ceramic structure having more than two substrate pieces.4. The method of wherein the fibrous material is a chopped fiber having an average length of from about 1/16th of an inch to about ½ of an inch.5. The method of wherein the fibrous material is selected from fibers of silica (SiO) claim 1 , alumina (AlO) claim 1 , zirconium oxide (ZrO) claim 1 , titanium oxide (TiO) claim 1 , aluminum silicate (Al—Si-oxide) claim 1 , aluminum borosilicate—with or without an alkali metal claim 1 , carbon claim 1 , borosilicate claim 1 , silicon nitride (SiN) or silicon carbide (SiC) and combinations of these fibers.6. The ...

METHOD FOR MANUFACTURING A TURBINE ENGINE VANE MADE OF A COMPOSITE MATERIAL, RESULTING VANE AND TURBINE ENGINE INCLUDING SAME

The invention relates to a method of fabricating a turbine engine blade out of composite material comprising fiber reinforcement densified by a matrix, the blade comprising an airfoil, a platform situated at a longitudinal end of the airfoil, and at least one functional element projecting from the outside face of the platform. The method comprises: 115-. (canceled)16. A turbine engine blade comprising an airfoil , a first platform situated at a longitudinal end of the airfoil and having an inside face defining a flow passage and an outside face opposite from the inside face , and at least one functional element extending from the outside face of the first platform and connecting with said outside face in a direction that is substantially circumferential;the blade being a single piece of composite material comprising multilayer woven fiber reinforcement densified by a matrix; andthe fiber reinforcement being a single piece with a first portion forming reinforcement for a blade airfoil and a second portion forming reinforcement for a first blade platform and for at least one functional element;in which blade the second fiber reinforcement portion comprises a set of yarn layers all interlinked by weaving, apart from in a separation zone between the reinforcement for the or each functional element and the reinforcement for the first platform.17. A turbine engine rotor blade comprising an airfoil , an outer platform forming a blade head situated at a longitudinal end of the airfoil and having an inside face defining a flow passage and an outside face opposite from the inside face , and head wipers extending from the outside face of the head and connecting with said outside face in a direction that is substantially circumferential;the blade being a single piece of composite material comprising multilayer woven fiber reinforcement densified by a matrix; andthe fiber reinforcement being a single piece with a first portion forming reinforcement for the airfoil and a second ...

CARBON FIBER-REINFORCED CARBIDE-CERAMIC COMPOSITE COMPONENT

A ceramic component is formed of at least one stack of two or more layers of one-directional non-woven carbon fiber fabrics embedded in a ceramic matrix containing silicon carbide and elemental silicon. All adjacent layers within the at least one stack directly adjoin each other. The at least one stack has a minimum thickness of 1.5 mm perpendicularly to the plane of the layers. The ceramic matrix permeates substantially the entire component. 1. A ceramic component , comprising:at least one stack having at least two layers of unidirectional carbon fiber nonwoven embedded in a ceramic matrix containing silicon carbide and elementary silicon;all mutually adjacent said layers within said at least one stack directly adjoining one another;said at least one stack having a thickness of at least 1.5 mm in a direction perpendicular to a plane of said layers; andsaid ceramic matrix substantially penetrating the ceramic component in its entirety.2. The ceramic component according to claim 1 , wherein said ceramic matrix has a homogeneous composition across the entire component.3. The ceramic component according to claim 1 , wherein consecutive said layers within said at least one stack differ from one another in terms of an orientation of carbon fibers thereof.4. The ceramic component according to claim 1 , wherein the component has an open porosity of no more than 3.5%.5. The ceramic component according to claim 1 , wherein the component has a fiber volume in a range of 50-65% of a volume of the component.6. The ceramic component according to claim 1 , wherein the component has a density of no more than 2.0 g/cm.7. The ceramic component according to claim 1 , configured as a charging rack.8. A composite component claim 1 , comprising at least two ceramic components according to integrally bonded to one another.9. A method of producing a ceramic component claim 1 , the method comprising the following steps:a) placing at least two unidirectional carbon fiber nonwovens, which ...

FIBER-REINFORCED SILICON CARBIDE COMPOSITE MATERIALS, METHOD FOR PRODUCING THE FIBER-REINFORCED SILICON CARBIDE COMPOSITE MATERIALS, AND USES OF THE FIBER-REINFORCED SILICON CARBIDE COMPOSITE MATERIALS

Silicon carbide composite materials contain CSiC with a density of 2.95 to 3.05 g/cmand a fiber bundle content of 2 to 10 wt. %. The fiber bundles have a length of 6 to 20 mm, a width of 0.2 to 3 mm, and a thickness of 0.1 to 0.8 mm. The fiber bundles are filled with a cured phenolic resin content of up to 45 wt. %, and the protected fiber bundles are integrated into an SiC matrix. A method produces the silicon carbide composite materials. 1. A silicon carbide composite material having a density from 2.95 to 3.05 g/cm , comprising:a SiC matrix; andstarting materials including fiber bundles impregnated with phenolic resin with a proportion of 0.5 to 10% by weight relative to a total weight of said starting materials used for a manufacture of green bodies, said fiber bundles having a length of 6 to 20 mm, a width of 0.2 to 3 mm and a thickness of 0.1 to 0.8 mm, and said fiber bundles used for manufacture of said green bodies contain a proportion of cured phenolic resin of up to 45% by weight.2. The silicon carbide composite materials according to claim 1 , wherein said fiber bundles have said length of 8 to 12 mm claim 1 , said width of 0.5 to 2 mm and said thickness of 0.2 to 0.7 mm.3. The silicon carbide composite materials according to claim 1 , wherein said fiber bundles have said length of 8 to 12 mm claim 1 , said width of 0.5 to 1 mm and said thickness of 0.2 to 0.5 mm.4. The silicon carbide composite materials according to claim 1 , wherein said SiC matrix contains:a SiC powder with a granularity of F150 and/or F360;a carbonized cellulose fiber; andat least one further raw material selected from the group consisting of acetylene coke, charcoal, a phenolic resin in liquid form and a phenolic resin in powder form.5. A method for producing silicon carbide composite materials claim 1 , which comprises the steps of:a) mixing/blending resin and fiber bundles impregnated with a phenolic resin and cured and containing a proportion of the phenolic resin of up to 45% by ...

METHOD FOR MANUFACTURING A PART MADE FROM CMC

A process for manufacturing a part made of composite material with a matrix at least predominantly made of ceramic includes producing a fibrous structure by three-dimensional or multilayer weaving; shaping the fibrous structure to form a fibrous preform core; depositing an interphase on the fibers of the preform core; consolidating the preform core by partial densification of the core including the formation of a matrix phase by chemical vapor infiltration or by a liquid process; depositing a powder of ceramic particles in the porosity of the preform core; draping one or more layers of pre-impregnated non-woven fibers over all or part of the outer surface of the preform core; heat treatment of the preform core and of the pre-impregnated layer(s) to form a hybrid fibrous preform; further densifying by infiltration of the hybrid fibrous preform with an infiltration composition containing at least silicon to obtain a ceramic matrix composite part. 1. A process for manufacturing a part made of a composite material with a matrix at least predominantly made of ceramic , the process comprising:producing a fibrous structure by three-dimensional or multilayer weaving;shaping the fibrous structure to form a fibrous preform core;depositing an interphase on the fibers of the preform core;consolidating the preform core by partial densification of said core comprising the formation of a matrix phase by chemical vapor infiltration or by a liquid process;depositing a powder of ceramic particles in the porosity of the preform core;draping one or more layers of pre-impregnated non-woven fibers over all or part of the outer surface of the preform core;performing a heat treatment of the preform core and of the pre-impregnated layer(s) to form a hybrid fibrous preform;further densifying by infiltration of the hybrid fibrous preform with an infiltration composition containing at least silicon in order to obtain a ceramic matrix composite part.2. The process as claimed in claim 1 , ...

Ceramic matrix composite components reinforced for managing multi-axial stresses and methods for fabricating the same

Ceramic matrix composite components and methods for fabricating ceramic matrix composite components are provided. In one example, a ceramic matrix composite component includes a ceramic matrix composite body. The ceramic matrix composite body includes a layer-to-layer weave of ceramic fibers and a layer of 1-directional and/or 2-directional (1D/2D) fabric of ceramic fibers disposed adjacent to the layer-to-layer weave. When stressed, the ceramic matrix composite body forms a relatively high through-thickness stress region and a relatively high in-plane bending stress region. The layer-to-layer weave is disposed through the relatively high through-thickness stress region and the layer of 1D/2D fabric is disposed through the relatively high in-plane bending stress region.

Carbon foam, stack carbon foam, and method of manufacturing stack carbon foam

It is an object of the present disclosure to provide a thin-film carbon foam and a method of manufacture the same. It is another object of the present disclosure to provide a stack carbon foam having fewer through holes and a method of manufacturing the same. The carbon foam of the present disclosure is, for example, a stack carbon foam being a stack of at least two monolayer carbon foams stacked one another, each monolayer carbon foam comprising linear portions and node portions joining the linear portions, or a carbon foam comprising linear portions and node portions joining the linear portions, wherein the ratio of the number of large through holes having a diameter of 1 mm or more to the surface area of the carbon foam is 0.0003/mm2 or less.

SILICON CARBIDE PRODUCTION METHOD AND SILICON CARBIDE COMPOSITE MATERIAL

Provided is a method for producing a novel silicon carbide that can be reacted at a low reaction temperature. The present invention pertains to a silicon carbide production method comprising a step for sintering a composition that at least contains: silicon nanoparticles having an average particle diameter of less than 200 nm; and a carbon-based material. 1. A silicon carbide production method , comprising: sintering a composition at least containing silicon nanoparticles having an average particle diameter of less than 200 nm and a carbon-based material.2. The production method according to claim 1 , wherein the silicon nanoparticles are doped with boron.3. The production method according to claim 2 , wherein the boron-doped silicon nanoparticles contain boron within a range of 10atoms/cmto 10atoms/cm.4. The production method according to claim 1 , wherein the carbon-based material is fibrous carbon.5. The production method according to claim 4 , wherein the fibrous carbon consists of carbon nanofibers having a diameter of 100 nm to 900 nm.6. The production method according to claim 1 , wherein the composition further contains a third component selected from the group consisting of silicon particles claim 1 , silicon carbide particles claim 1 , silicon nitride particles claim 1 , silica particles claim 1 , aluminum carbide particles claim 1 , aluminum nitride particles claim 1 , alumina particles claim 1 , boron nitride particles claim 1 , boron oxide particles claim 1 , boron carbide particles claim 1 , carbon fibers and mixtures thereof.7. The production method according to claim 4 , wherein thermal conductivity of the fibrous carbon is 80 W/(m·K) to 1000 W/(m·K).8. The production method according to claim 4 , for obtaining a silicon carbide composite material containing fibrous carbon claim 4 , in which the number of moles of silicon in the silicon nanoparticles is lower than the number of moles of carbon in the fibrous carbon.9. A silicon carbide sintering ...

CONTINUOUS BORON NITRIDE NANOTUBE YARNS AND METHODS OF PRODUCTION

A method and apparatus for producing boron nitride nanotubes and continuous boron nitride nanotube yarn or tapes is provided. The apparatus includes rotating reaction tubes that allow for continuous chemical vapor deposition of boron nitride nanotubes. The rotation of the reaction tubes allows the boron nitride nanotubes to be spun into yarns or made into tapes, without post process or external rotation or spinning of the gathered nanotubes. Boron nitride nanotube yarns or tapes of great length can be produced as a result, thereby providing industry with a readily useable format for this type of material. Dopants such as carbon can be added to engineer the band gap of the nanotubes. Catalysts may be formed outside or inside the reactor. 17-. (canceled)8. A method of producing boron-nitride nanotube continuous yarn , the method comprising:feeding a boron containing gas species and a nitrogen containing gas species, the nitrogen containing gas species and the boron containing gas species being the same or different, a carrier gas, and a catalyst or a catalyst precursor into a plurality of reaction tubes, each reaction tube having a first portion at a first temperature and a second portion at a second temperature greater than the first temperature;rotating the reaction tubes around a common axis while the boron, nitrogen and catalyst flow from the first portion to the second portion of each of the plurality of reaction tubes;growing boron-nitride nanotubes towards an end of each of the plurality of reaction tubes; andcombining the boron-nitride nanotubes into a yarn as the nanotubes exit the reaction tubes.9. The method of further comprising growing boron nitride nanotubes in a furnace reactor downstream of the end of the rotating reaction tubes.10. The method of wherein the boron containing gas species and the nitrogen containing gas species are within the same compound or complex.11. The method of wherein the boron containing gas species and the nitrogen containing ...

ARTICLE WITH CERAMIC BARRIER COATING AND LAYER OF NETWORKED CERAMIC NANOFIBERS

An article includes a substrate, a ceramic barrier coating, and a layer of networked ceramic nanofibers. The ceramic barrier coating is disposed on the substrate and has a porous columnar microstructure. The layer of networked ceramic nanofibers is disposed on the ceramic barrier layer and seals the pores of the porous columnar microstructure. 1. An article comprising:a substrate;a ceramic barrier coating disposed on the substrate, the ceramic barrier coating having a porous columnar microstructure; anda layer of networked ceramic nanofibers disposed on the ceramic barrier layer and sealing the pores of the porous columnar microstructure.2. The article as recited in claim 1 , wherein the ceramic nanofibers include zirconium oxide.3. The article as recited in claim 1 , wherein the ceramic nanofibers are selected from the group consisting of yttria stabilized zirconia claim 1 , gadolinia zirconate claim 1 , and combinations thereof.4. The article as recited in claim 1 , wherein the ceramic barrier coating includes zirconium oxide.5. The article as recited in claim 1 , wherein the ceramic barrier coating is selected from the group consisting of yttria stabilized zirconia claim 1 , gadolinia zirconate claim 1 , and combinations thereof.6. The article as recited in claim 1 , wherein the substrate is a metal alloy.7. The article as recited in claim 1 , wherein the layer has a thickness of 1 micrometer to 50 micrometers.8. The article as recited in claim 7 , wherein the thickness is from 1 micrometer to 5 micrometers.9. The article as recited in claim 1 , wherein the ceramic barrier coating has a thickness t1 and the layer has a thickness t2 claim 1 , and t2 is less than t1 by a factor of at least 5.10. The article as recited in claim 1 , wherein the ceramic nanofibers of the layer extend into the pores of the porous columnar microstructure.11. The article as recited in claim 1 , further comprising an additional ceramic barrier coating disposed on the layer of the ...

METHOD FOR FABRICATING A CERAMIC MATERIAL

A ceramic article includes a ceramic matrix composite that has a porous reinforcement structure and a ceramic matrix within pores of the porous reinforcement structure. The ceramic matrix composite includes a surface zone and a glaze material within pores of the surface zone and on an exterior side of the surface zone as an exterior glaze layer. 1. A ceramic article comprising:a ceramic matrix composite including a porous reinforcement structure and a ceramic matrix within pores of the porous reinforcement structure, the ceramic matrix composite including a surface zone; anda glaze material within pores of the surface zone and on an exterior side of the surface zone as an exterior glaze layer on the ceramic matrix composite.2. The ceramic article as recited in claim 1 , wherein the glaze material is free silicon.3. The ceramic component as recited in claim 1 , wherein the glaze material is a free metal selected from the group consisting of boron claim 1 , titanium claim 1 , vanadium claim 1 , chromium claim 1 , zirconium claim 1 , niobium claim 1 , molybdenum claim 1 , ruthenium claim 1 , rhodium claim 1 , hafnium claim 1 , tantalum claim 1 , tungsten claim 1 , rhenium claim 1 , osmium claim 1 , iridium and combinations thereof.4. The ceramic component as recited in claim 3 , wherein the free metal is selected from the group consisting of boron claim 3 , zirconium claim 3 , and combinations thereof.5. The ceramic component as recited in claim 1 , wherein the free metal is selected from the group consisting of vanadium claim 1 , molybdenum claim 1 , hafnium claim 1 , tantalum claim 1 , and combinations thereof.6. The ceramic article as recited in claim 1 , where the glaze material contains free silicon and a free metal selected from the group consisting of boron claim 1 , titanium claim 1 , vanadium claim 1 , chromium claim 1 , zirconium claim 1 , niobium claim 1 , molybdenum claim 1 , ruthenium claim 1 , rhodium claim 1 , hafnium claim 1 , tantalum claim 1 , ...

Composite material having an aluminosilicate matrix, in particular made from barium aluminosilicate (bas) reinforced with metal oxide reinforcements, and method for preparing same

A composite material consisting of a matrix made of at least one aluminosilicate notably selected from barium aluminosilicate BAS, barium and strontium aluminosilicate BSAS, strontium aluminosilicate SAS, and mixtures thereof, reinforced by reinforcements made of at least one metal or metalloid oxide, the expansion coefficient of which is close to that of said at least one aluminosilicate. A method for preparing said composite material. A composite material according to the invention notably finding its application in the aeronautical or aerospace field, for example for the manufacture of radomes.

METHOD FOR CONTROLLING CHARACTERISTICS OF CERAMIC CARBON COMPOSITE, AND CERAMIC CARBON COMPOSITE

In a method for controlling characteristics of a ceramic carbon composite, an interfacial layer of a ceramic is formed throughout a carbonaceous material and the interfacial layer of the ceramic has a continuous three-dimensional network throughout the carbonaceous material; and characteristics of a ceramic carbon composite are controlled. In a method, an interfacial layer () of a ceramic is formed throughout a carbonaceous material () and the interfacial layer () of the ceramic has a continuous three-dimensional network throughout the carbonaceous material (), the characteristics of the ceramic carbon composite () is controlled by specifying and selecting at least one of a shape, a hardness, and a degree of graphitization of the carbonaceous material (). Thus, the ceramic carbon composite () having the characteristics controlled without depending on the control of manufacturing conditions can be obtained. 111-. (canceled)12. A method for manufacturing a ceramic carbon composite in which an interfacial layer of a ceramic is formed throughout a carbonaceous material and the interfacial layer of the ceramic has a continuous three-dimensional network throughout the carbonaceous material , the method comprising specifying and selecting an aspect ratio (average long-axis diameter to average short-axis diameter) of the carbonaceous material in a range of from 1.5 to 20 to obtain a ceramic carbon composite having a thermal conductivity showing a ratio close to the aspect ratio.13. A method for manufacturing a ceramic carbon composite in which an interfacial layer of a ceramic is formed throughout a carbonaceous material and the interfacial layer of the ceramic has a continuous three-dimensional network throughout the carbonaceous material ,wherein graphite particles thermally treated at 1200° C. to 2500° C. are used as the carbonaceous material.14. A ceramic carbon composite in which an interfacial layer of a ceramic is formed throughout a carbonaceous material and the ...

MOLYBDENUM CARBIDE / CARBON COMPOSITE AND MANUFACTURING METHOD

A composite material comprising molybdenum carbide, graphite and carbon fibers combines a very high thermal conductivity with a low coefficient of thermal extension, high service temperature, good mechanical properties and high electrical conductivity. These materials may be obtained from high-temperature sintering of variable proportions of molybdenum powders and ceramic materials such as graphite, carbon fibers, silicon, silicon carbide, or tungsten. 1. A composite material , comprising molybdenum carbide , graphite and carbon fibers.2. The composite material according to claim 1 , wherein said carbon fibers are pitch-based fibers.3. The composite material according to claim 1 , wherein at least a part of said carbon fibers are fibers with a length no smaller than 2 mm and/or no greater than 6 mm.4. The composite material according to claim 1 , wherein at least a part of said carbon fibers are fibers with a length no smaller than 0.05 mm and/or no greater than 1 mm claim 1 , preferably no greater than 0.3 mm.5. The composite material according to claim 1 , wherein said fibers comprise both long fibers and short fibers claim 1 , wherein said long fibers have a length no shorter than 2 mm and/or no longer than 6 mm claim 1 , and wherein said short fibers have a length no shorter than 0.05 mm and/or no longer than 1 mm claim 1 , preferably no longer than 0.3 mm.6. The composite material according to claim 1 , comprising at least 1% by volume of said carbon fibers claim 1 , preferably at least 10% by volume of said carbon fibers claim 1 , and particularly at least 20%.7. The composite material according to claim 1 , comprising at most 40% by volume of carbon fibers claim 1 , and preferably at most 30% by volume.8. The composite material according to claim 1 , further comprising a refractory metal claim 1 , particularly tungsten.9. The composite material according to claim 8 , comprising at most 10% by volume of tungsten powder claim 8 , and preferably at most 1.5% by ...

CERAMIC MATRIX COMPOSITE MEMBER AND METHOD OF MANUFACTURING THE SAME

A ceramic matrix composite member used as a turbine blade includes a principal part forming a blade part and a dovetail part, and a subordinate part forming a platform part. A principal fiber in a ceramic fiber fabric forming the principal part is a continuous fiber. An extension direction of the principal fiber is in parallel with a direction in which stress is applied. The ceramic fiber fabrics respectively forming the principal part and the subordinate part are joined together and formed into an integrated three-pronged fiber fabric. The ceramic fiber fabric forming the principal part and the ceramic fiber fabric forming the subordinate part are integrated together by being set into a mold with the ceramic fiber fabric forming the subordinate part folded at a desired angle to the ceramic fiber fabric forming the principal part. Then, a ceramic matrix is formed in the obtained molded body. 1a principal part forming a blade part and a dovetail part; anda subordinate part forming a platform part, whereina principal fiber in a ceramic fiber fabric forming the principal part is a continuous fiber,a direction of the principal fiber is in parallel with a direction in which stress is applied,the ceramic fiber fabric forming the principal part and a ceramic fiber fabric forming the subordinate part are joined together to form an integrated three-pronged fiber fabric,the ceramic fiber fabric forming the principal part and the ceramic fiber fabric forming the subordinate part are integrated together by being set into a mold with the ceramic fiber fabric forming the subordinate part folded at a desired angle to the ceramic fiber fabric forming the principal part, anda ceramic matrix is formed in the obtained molded body.. A ceramic matrix composite member to be used as a turbine blade, comprising: This application is a divisional of U.S. application Ser. No. 14/250,044 filed Apr. 10, 2014, which is a continuation application of International Application No. PCT/JP2012/076160 ...

Environment-resistive coated reinforcement fiber applicable to fiber-reinforced composite

A high-temperature-steam-oxidation-resistive coated reinforcement fiber applicable to a fiber reinforced composite, is provided with: a reinforcement fiber; a coating layer covering the reinforcement fiber and including a rare-earth silicate; an exfoliative layer intervening in an interface between the coating layer and the reinforcement fiber; and a supplemental coating layer covering the reinforcement fiber, the exfoliative layer and the coating layer.

METHOD FOR FABRICATING A CERAMIC MATRIX COMPOSITE ROTOR BLADE

A method for making a turbine engine blade includes three-dimensionally weaving elongate fibers of a material selected from the group consisting of carbon, glass, silica, silicon carbide, silicon nitride, aluminum, aramid, aromatic polyamide, and combinations thereof to create a woven preform including a single piece of woven material. The woven preform includes continuous warp fibers extending along a first direction, continuous weft fibers extending along a second direction substantially normal to the first direction, and continuous fibers extending in a third direction substantially normal to the first and the second directions. The woven preform includes an airfoil region extending along the first direction and an arrangement of flaps extending along the second direction. The flaps are folded into a plane substantially normal to a plane of the airfoil region to form a shaped woven preform. The shaped woven preform is densified with a ceramic matrix. 1. A method for making a turbine engine blade , comprising:three-dimensionally weaving elongate fibers of a material selected from the group consisting of carbon, glass, silica, silicon carbide, silicon nitride, aluminum, aramid, aromatic polyamide, and combinations thereof to create a woven preform comprising a single piece of woven material, wherein the woven preform comprises continuous warp fibers extending along a first direction, continuous weft fibers extending along a second direction substantially normal to the first direction, and continuous fibers extending in a third direction substantially normal to the first and the second directions; and wherein the woven preform comprises an airfoil region extending along the first direction and an arrangement of flaps adjacent to the airfoil region;folding the flaps into a plane substantially normal to a plane of the airfoil region to form a shaped woven preform; anddensifying the shaped woven preform with a ceramic matrix to obtain a ceramic matrix composite (CMC) ...

Ceramic matrix composite

A novel ceramic matrix composite is disclosed for forming components that are operable in high temperature environments such those in gas turbine engines and the like. The ceramic matrix composite can include at least one layer of non-crimped fibers positioned substantially parallel to one another. A relatively small diameter elastic fiber can be constructed to stitch the non-crimped fibers together and a ceramic matrix may be deposited around the at least one layer of non-crimped fibers.

STRAIN SENSING IN COMPOSITE MATERIALS

A method of sensing strain in a structural component, the method comprising the steps of providing, embedded within said structural component, at least one carbon fibre element () coated with an electrically conductive material (), measuring the electrical resistance of said coated carbon fibre element and determining strain in respect of said carbon fibre element based on changes in said electrical resistance thereof. A method of manufacturing a carbon fibre element, a carbon fibre element so manufactured, and a carbon fibre reinforced structural component including such a carbon fibre element are also disclosed. 1. A method of sensing strain in a structural component , the method comprising:providing, embedded within said structural component, at least one carbon fibre element coated with an electrically conductive material;measuring an electrical resistance of said coated carbon fibre element; anddetermining strain in respect of said carbon fibre element based on changes in said electrical resistance thereof.2. The method according to claim 1 , wherein said electrically conductive material has a thermal coefficient of resistance which is of opposite sign and substantially equal magnitude to an electrical resistance of said carbon fibre.3. The method according to claim 1 , wherein a thickness of the coating of said electrically conductive material is such that a resistance per unit length of said electrically conductive material is substantially equal to a resistance per unit length of said carbon fibre.4. The method according to claim 1 , wherein said electrically conductive material exhibits negligible piezoresistance.5. The method according to claim 1 , wherein said electrically conductive material is a metal or a metal alloy.6. The method according to claim 5 , wherein said electrically conductive material comprises nickel.7. The method according to claim 6 , wherein said electrically conductive material comprises a nickel-copper alloy or phosphorous nickel ...

SACRIFICIAL 3-DIMENSIONAL WEAVING METHOD AND CERAMIC MATRIX COMPOSITES FORMED THEREFROM

A ceramic matrix composite (CMC) is formed using a three-dimensional (3-D) woven preform by removing the set of sacrificial fibers from the 3-D woven preform and allowing a metal or metal alloy infiltrate the 3-D woven preform. The 3-D woven preform is formed by a method that includes providing a woven layer comprising a first set of ceramic fibers oriented in a first (x) direction woven with a second set of ceramic fibers oriented in a second (y) direction; stacking a plurality of woven layers on top of each other, said woven layers providing a two-dimensional (2-D) preform; weaving a set of sacrificial fibers in a third (z) direction with the 2-D preform, said weaving providing the 3-D woven preform; and shaping the 3-D woven preform into a predetermined shape. 1. A method of forming a three-dimensional (3-D) woven preform for use in a ceramic matrix composite (CMC) , the method comprising:providing a woven layer comprising a first set of ceramic fibers oriented in a first (x) direction woven with a second set of ceramic fibers oriented in a second (y) direction;stacking a plurality of woven layers on top of each other, said woven layers providing a two-dimensional (2-D) preform;weaving a set of sacrificial fibers in a third (z) direction with the 2-D preform, said weaving providing the 3-D woven preform; andshaping the 3-D woven preform into a predetermined shape.2. The method according to claim 1 , wherein the first set of ceramic fibers and the second set of ceramic fibers comprise individual filaments or filament bundles that are the same or different in composition and/or diameter.3. The method according to claim 2 , wherein the first set of ceramic fibers and the second set of ceramic fibers are the same in composition and/or diameter.4. The method according to claim 1 , wherein the first set of ceramic fibers claim 1 , the second set of ceramic fibers claim 1 , and the sacrificial fibers are woven such that each are present in an amount that ranges between ...