Reaction injection molding of silicon nitride ceramics having crystallized grain boundary phases
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United States of America Patent
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Aug 31, 1993
Issued Date -
N/A
app pub date -
Mar 10, 1992
filing date -
Mar 26, 1991
priority date (Note) -
Expired
status (Latency Note)
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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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