Silicon nitride sintered bodies and a method of manufacturing th

Details Silicon nitride sintered bodies and a method of manufacturing th Silicon nitride sintered bodies and a method of manufacturing th

1987-04-07

1989-01-31

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 97, 264 65, C04B 3558

Patent

active

048015652

ABSTRACT:
A silicon nitride sintered bodies are disclosed, which mainly consist of Si.sub.3 N.sub.4 and contains at least an oxide of a rare earth element and ZrO.sub.2. In the silicon nitride sintered bodies, a J phase solid solution is present in an intergranular phase. The silicon nitride sintered bodies are produced by steps of raw material-formulating, molding and firing. The J phase solution is precipitated in the intergranular phase by temperature-descending step or a reheating step after the firing.

REFERENCES:
patent: 4388414 (1983-06-01), Mangels et al.
patent: 4560669 (1985-12-01), Matsuhiro et al.
patent: 4640902 (1987-02-01), Lange
838 American Ceramic Soc. Bull., "Silicon Terbium Oxynitride of Composition Tb.sub.4 Si.sub.2 O.sub.7 N.sub.2 ", vol. 58 (1979) Aug. No. 8 M. Montorsi et al., page 789.
838 American Ceramic Society Bulletin, "Fabrication and Properties of Dense Polyphase Silicon Nitride", vol. 62 (1983) Dec., No. 12, Columbus, Ohio, USA, Frederick K. Lange, pp. 1369-1374.
838 Ceramic Bulletin, "Preparation and Characterization of Ultrafine Powders of Refractory Nitrides: II, Sialon", vol. 58, No. 2 (1979.02), M. Hoch et al., pp. 191-193.
838 Journal of American Ceramic Soc., "The Role of Cerium Orthosilicate in the Densification of Si.sub.3 N.sub.4 ", vol. 62, No. 1/2, (1979.01/02), Tai-il Mah et al., pp. 12-16.

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