Reaction injection molding of silicon nitride ceramics having cr

Details Reaction injection molding of silicon nitride ceramics having cr Reaction injection molding of silicon nitride ceramics having cr

1993-08-30

1995-02-14

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501 96, 501 98, C04B 3538

Patent

active

053895886

ABSTRACT:
A sintered, Si.sub.3 N.sub.4 -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) Si.sub.3 N.sub.4, (ii) a silicate glass-forming sintering aid and (iii) a high metal content silicide, and (b) a curable Si.sub.3 N.sub.4 precursor binder, to cure the binder and produce a hardened molded article, and (2) heating the molded article under a suitable atmosphere to convert the cured binder to a Si.sub.3 N.sub.4 -containing ceramic. The molded article is then sintered under a vacuum to crystallize the silicate glass phase by deoxygenation.

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