Silicon nitride sintered bodies

Details Silicon nitride sintered bodies Silicon nitride sintered bodies

1990-05-10

1993-01-05

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

C04B 3550

Patent

active

051770385

ABSTRACT:
Silicon nitride sintered bodies are disclosed which contain silicon carbide therein and in which intergranular phases between silicon nitride particles are substantially crystallized. Further, a manufacturing method of the sintered bodies is disclosed, in which a silicon carbide powdery raw material is used as an additive when preparing raw powders and the intergranular phases are crystallized during a temperature descending stage following a firing. Silicon carbide effectively promotes densification of the structure of the sintered body and crystallization of the intergranular phases, thereby making it possible to provide the sintered bodies having intergranular phases with little glass phases uncrystallized and excellent high-temperature strengths.

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Chemical Abstracts, vol. III, No. 6, Aug. 7, 1989, p. 312, abstract No. 44244x, Columbus, Ohio, US; & JP-A-01 09 872 (Nissan Motor Co., Ltd) Jan. 13, 1989.
The Mechanical Properties of Silicon Nitride and Silicon Carbide Part I: Materials and Strength, Powder Metallurgical Review 8, J. W. Edington et al, pp. 82-96, vol. 7, No. 2, 1975.
Hot-Pressed Si.sub.3 N.sub.4, Journal of The American Ceramic Society-Discussions and Notes, G. E. Gassa, vol. 56, No. 12.

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