Silicon nitride sintered body

Details Silicon nitride sintered body Silicon nitride sintered body

1992-09-08

1994-01-04

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 97, C04B 3558

Patent

active

052759865

ABSTRACT:
A silicon nitride sintered body comprising .alpha.-silicon nitride including .alpha.'-sialon and .beta.'-sialon including .beta.-silicon nitride in which the content of the .alpha.-silicon nitride including .alpha.'-sialon in the surface part thereof is less than its content in the inner part thereof. The silicon nitride sintered body is excellent in mechanical strength at ordinary temperature, productivity and cost efficiency.

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Mitomo et al, Sintering Behavior of Si.sub.3 N.sub.4 with Y.sub.2 O.sub.3 and Al.sub.2 O.sub.3 Addition, pp. 96-101, 1986, Ceramic Society 94(1).
Richerson, Effect of Impurities on the High Temperature Properties of Hot Pressed Silicon Nitride, AM. Ceramic Bulletin 52, 1973, pp. 560`562.

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