Si.sub.3 N.sub.4 Ceramic powder material and method for manufact

Details Si.sub.3 N.sub.4 Ceramic powder material and method for manufact Si.sub.3 N.sub.4 Ceramic powder material and method for manufact

1980-12-31

1982-07-27

Bell, Mark

Compositions: ceramic

Ceramic compositions

Refractory

C04B 3558

Patent

active

043418740

ABSTRACT:
Ceramic powder material mainly consists of silicon nitride wherein the content of oxygen combined with generally unavoidable impurities as measured by activation analysis accounts for less than 2% by weight. The above-mentioned ceramic powder material can also be prepared preferably by the method which comprises the step of heating raw ceramic powder material mainly consisting of silicon nitride to 1,400.degree. C. to 1,900.degree. C. in the presence of a separately prepared nonsintered molding of ceramic material or sintered molding of ceramic material having a porosity of at least 10%.

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patent: 3836374 (1974-09-01), Richerson et al.
patent: 3969125 (1976-07-01), Komeya et al.
patent: 3992497 (1976-11-01), Terwilliger
patent: 4046580 (1977-09-01), Isbii et al.
patent: 4071371 (1978-01-01), Milberg et al.
Chemiker-Zeitung, vol. 95, 1971, No. 22 p. 932.
Ber. Dt. Keram. Ges., 51, 1974, No. 5, pp. 127-130: Feld et al.
Ceramic Bulletin, vol. 54, No. 9, 1975, p. 780.

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