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

1994-06-10

1995-08-15

Walsh, Donald P.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Special medium during sintering

264 63, 264 65, 264 66, 419 10, 419 13, 419 23, 419 33, 419 36, 419 45, 419 53, 419 60, B22F 100

Patent

active

054416949

ABSTRACT:
In a method for preparing a high .alpha.-type silicon nitride powder by adding to and mixing with metallic silicon powder a copper catalyst and nitriding the mixture in a non-oxidizing gas atmosphere containing nitrogen or ammonia at 1,000.degree. to 1,500.degree. C., the amount of copper catalyst is limited to from 0.05 % to less than 0.5 % by weight of copper based on the weight of the metallic silicon. There is obtained silicon nitride powder of high purity at low cost and high efficiency since the copper catalyst can be efficiently removed from the silicon nitride powder through conventional acid treatment.

REFERENCES:
patent: 3206318 (1965-09-01), Yamauchi et al.
patent: 4087500 (1978-05-01), Fisher et al.
patent: 4716133 (1987-12-01), Horiuchi et al.
patent: 5344634 (1994-09-01), Edler
Patent Abstracts of Japan, vol. 8, No. 205 (C-243)(1642) (Sep. 19, 1984).
Patent Abstracts of Japan, vol. 3, No. 142 (C-65) (Nov. 24, 1979).
Patent Abstracts of Japan, vol. 3, No. 83 (C-52) (Jul. 18, 1979).

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