Preparation of high alpha-type silicon nitride powder

Details Preparation of high alpha-type silicon nitride powder Preparation of high alpha-type silicon nitride powder

1994-07-12

1995-10-10

Langel, Wayne

Chemistry of inorganic compounds

Silicon or compound thereof

Binary compound

C01B 21068

Patent

active

054568960

ABSTRACT:
Silicon nitride powder is prepared by nitriding metallic silicon powder in a nitriding gas atmosphere at a temperature of 1,000.degree. C.-1,500.degree. C. Midway the nitriding step, the nitrided product is heat treated in an inert non-oxidizing gas atmosphere or vacuum at a temperature higher than the nitriding temperature, but lower than 1,600.degree. C. The product is nitrided again, obtaining high .alpha.-content silicon nitride powder.

REFERENCES:
patent: 4127630 (1978-11-01), Washburn
patent: 4517168 (1985-05-01), Kawahito et al.
patent: 5032370 (1991-07-01), Merzhanov et al.
patent: 5073358 (1991-12-01), Shimizu et al.
patent: 5232677 (1993-08-01), Fukuoka et al.
patent: 5344634 (1994-09-01), Edler
Patent Abstracts of Japan, vol. 013, No. 501 (C-652) 10 Nov. 1989 & JP-A-01 201 012 (Japan Metals & Chem Co., Ltd.) 14 Aug. 1989.
European Patent Application 0410459A2 published Jan. 30, 1991.

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