Silicon nitride ceramics containing crystallized grain boundary phases
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United States of America Patent
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Aug 10, 1993
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N/A
app pub date -
Jan 27, 1992
filing date -
Jan 27, 1992
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Expired
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Abstract
A silicon nitride ceramic having crystalline grain boundary phases is prepared by heating a composition comprising silicon nitride, a silicate glass-forming sintering aid and a high metal content transition metal silicide, to a temperature of 1300.degree. to 1800.degree. C. under vacuum until a glass forms, oxygen is removed from the glass, and the glass crystallizes. Alternatively, the grain boundaries of a sintered composition comprising silicon nitride, a silicate glass and a high metal content transition metal silicide can be crystallized by heating to at least 1300.degree. C. under a vacuum.
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