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CERMET OR CERAMIC/GLASS COMPOSITES INCLUDING SELF-REINFORCED BETA-SILICON NITRIDE, AND METHOD OF MAKING SAME
CERMET OR CERAMIC/GLASS COMPOSITES INCLUDING SELF-REINFORCED BETA-SILICON NITRIDE, AND METHOD OF MAKING SAME
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机译:包括自增强β-硅氮化物的金属陶瓷或陶瓷/玻璃复合材料及其制造方法
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摘要
Infiltrate a porous, self-reinforced β-Si3N4 preform with a metal or a crystallizable glass to yield a composite material. The preform possesses a low glass phase and has a density of from 50 to 70 percent of theoretical density. Prepare the β-Si3N4 preform by subjecting a porous body formed from an α-Si3N4 powder composition to two sequential heat treatments. The first heat treatment occurs below the α- to β-conversion temperature and results in a strengthened body that can be machined. The second heat treatment occurs above that temperature and yields the self-reinforced β-Si3N4 preform. Conventional infiltration procedures with an infiltrant that is a metal or a glass results in an Si3N4/metal or Si3N4/glass composite material that has 50 to 70 percent of its volume occupied by β-Si3N4 whiskers.
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