Silicon nitride ceramics containing crystallized grain boundary

Details Silicon nitride ceramics containing crystallized grain boundary Silicon nitride ceramics containing crystallized grain boundary

1992-01-27

1993-08-10

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264101, 264102, 501 96, 501 97, C04B 3558

Patent

active

052346439

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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