摘要:
Procédé de fabrication d'une pièce en CMC, c'est-à-dire en matériau composite à matrice céramique, ainsi qu'une telle pièce en CMC, le procédé comprenant les étapes suivantes : fourniture (El) d'un renfort fibreux (10), injection (E3) d'une barbotine comprenant au moins une poudre céramique et un solvant, la barbotine étant injectée de manière à imprégner le renfort fibreux (10) et à remplir un volume situé à la surface d'au moins une portion du renfort fibreux (10), séchage (E4) de l'ensemble obtenu, densification (E6) par infiltration d'un matériau de densification liquide et solidification dudit matériau de densification
摘要:
An ink of the formula: 60-80% by weight BaTi03 particles coated with Si02; 5-50% by weight high dielectric constant glass; 0.1-5% by weight surfactant; 5-25%, by weight solvent; and 5-25% weight organic vehicle. Also a method of manufacturing a capacitor comprising the steps of: heating particles of BaTi03 for a special heating cycle, under a mixture of 70-96% by volume N2 and 4-30% by volume H2 gas; depositing a film of Si02 over the particles; mechanically separating the particles; Incorporating them into the above described ink formulation; depositing the ink on a substrate; and heating at 850-900°C for less than 5 minutes and allowing the ink and substrate to cool to ambient in N2 atmosphere. Also a dielectric made by: heating particles of BaTi03 for a special heating cycle, under a mixture of 70-96% by volume N2 and 4-30% by volume H2 gas; depositing a film of Si02 over the particles; mechanically separating me particles; forming them into a layer; and heating at 850-900°C and allowing the layer to cool in N2 atmosphere.
摘要:
Die vorliegende Erfindung betrifft elektrisch leitfähige, farbige Interferenzpigmente, insbesondere plättchenförmige Interferenzpigmente, die eine äußerste Schicht aufweisen, die kristallinen Kohlenstoff in Form von Graphit und/oder Graphen enthält, ein Verfahren zur Herstellung solcher Pigmente sowie die Verwendung der so hergestellten Pigmente.
摘要:
A method of producing a ceramic material includes heating solid silicon monoxide to provide gaseous silicon monoxide, and exposing a structure having a free-carbon-containing material to the gaseous silicon monoxide to convert free carbon of the free-carbon-containing material to silicon carbide. Also disclosed is an intermediate article that includes a solid structure having free carbon and a solid, in-situ source of silicon monoxide gas. Also disclosed is a composition that includes a polymeric carrier phase and particulate of solid silicon monoxide dispersed in the polymeric carrier phase.
摘要:
A multi-layer fiber coating is provided which, in an illustrative embodiment, includes: a ceramic grade Nicalon preform; a silicon carbide coat applied over the fibers; a boron nitride interface coat applied over the silicon carbide coat; wherein the boron nitride coat has a thickness of about 0.5 micron; a silicon carbide coat applied over the boron nitride coat; and wherein the silicon carbide has a thickness of about 2 micron. A multi-layer fiber coating, comprising: a Tyranno Lox-M fiber coated in tow form with 1 micron of silicon carbide by a chemical vapor deposition process and about 1 micron of silicon nitride; a silicon doped boron nitride coat is applied over the about 1 micron of silicon nitride; and wherein the doped boron nitride coat has a thickness of 0.3 micron is also provided. A multi-layer fiber coating, comprising: a T-300 carbon fiber preform; a coat that is graded from PyC to SiC is applied over the T-300 carbon fiber preform; wherein the graded PyC to SiC coat has a thickness of about 1.5 micron; a silicon doped boron nitride interface coat is applied over the graded PyC to SiC coat; wherein the silicon doped boron nitride interface coat has a thickness of about 0.5 micron; and a silicon carbide coat of 2 micron is applied over the silicon doped boron nitride interface coat, is also provided.
摘要:
A fiber having an environmental barrier coating is provided that includes, in one illustrative form, a Hi Nicalon preform assembled in a tooling for chemical vapor infiltration and cleaned to remove sizing char from fibers of the Hi Nicalon preform; a ytterbium doped silicon carbide coat located over the Hi Nicalon preform; a boron nitride interface coat applied over the ytterbium doped silicon carbide coat; and a silicon carbide coat applied over the boron nitride interface coat.
摘要:
A method of producing a ceramic matrix composite comprising: a) applying a fiber interface coating to the composite, b) coating the composite via chemical vapor infiltration, and c) infiltrating the composite with molten material, wherein the composite is not removed from a tool between steps (a), (b), and (c), wherein the fiber interface coating and the chemical vapor infiltration are forced flow processes, wherein the forced flow fiber interface coating applies a pressure gradient of about 0.005 to about 1.0 atm, wherein the coating is carbon, boron nitride, or silicon doped boron nitride, wherein the chemical vapor infiltration applies silicon carbide, silicon nitride carbide, boron carbide, or carbon as a coating, wherein the coating is about 0.1 [micro]m to about 15.0 [micro]m, wherein the ceramic matrix composite is a tool, wherein the molten material comprises an alloy, wherein the molten material comprises silicon carbide, carbon, or a ceramic particulate, wherein the composite is multi-layered, wherein at least one layer comprises at least one of a carbide, a nitride, a boride, or carbon, for instance one layer is silicon carbide or boron nitride.
摘要:
A high strength ceramic matrix composite and method for same is provided. A fiber preform is provided that is either self-supporting or is constrained by a tool for subsequent processing. The preform is coated with about 0.1 μm to about 5 μm of silicon carbide. The silicon carbide is coated with about 0.05 μm to about 2 μm boron nitride, carbon, or other interface layer. The interface layer is coated with at least about 0.2 μm to about 40 μm of silicon carbide.