Silicon nitride sintered body and method of producing the same

Details Silicon nitride sintered body and method of producing the same Silicon nitride sintered body and method of producing the same

1991-01-25

1992-03-17

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 97, 501 98, C04B 3558

Patent

active

050968599

ABSTRACT:
A silicon nitride sintered body having a high strength at high temperatures as well as at room temperature can be provided by the method of the present invention, which includes preparing a raw material consisting of Si.sub.3 N.sub.4 powder, a rare earth element oxide powder, and SiC powder, and at least one of a W compound powder and a Mo compound powder, forming the raw material into a shaped body, and then firing the shaped body in N.sub.2 atomsphere to substantially crystallize the grain boundary phase of the Si.sub.3 N.sub.4 grains. The silicon nitride sintered body includes Si.sub.3 N.sub.4 as a main component, and the remainder of a rare earth element compound, SiC and at least one of a W compound and a Mo compound, the grain boundary phase of Si.sub.3 N.sub.4 grains consisting substantially of crystal phases. The silicon nitride sintered body is dense and thin in color so that uneven coloring thereof can be decreased.

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