Reaction injection molding of silicon nitride ceramics...

Details Reaction injection molding of silicon nitride ceramics... Reaction injection molding of silicon nitride ceramics...

B - Operations, Transporting

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B28B 1/24 (2006.01) C04B 35/16 (2006.01) C04B 35/58 (2006.01) C04B 35/589 (2006.01) C04B 35/64 (2006.01)

Patent

CA 2090537

Lukacs & Matsumoto Case 1 REACTION INJECTION MOLDING OF SILICON NITRIDE CERAMICS HAVING CRYSTALLIZED GRAIN BOUNDARY PHASES Abstract of the Disclosure A sintered, Si3N4-containing ceramic article is prepared by a reaction injection molding process comprising (1) injecting into a heated mold a fluid, nondilatant mixture of (a) at least 40% by volume of a powder mixture of (i) Si3N4, (ii) a silicate glass-forming sintering aid and (iii) a high metal content silicide, and (b) a curable Si3N4 precursor binder, to cure the binder and produce a hardened molded article, (2) heating the hardened molded article under a suitable atmosphere to convert the cured binder to a Si3N4-containing ceramic, and (3) sintering the molded article under a vacuum to crystallize the silicate glass phase by deoxygenation.

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