Chemistry of inorganic compounds – Silicon or compound thereof – Binary compound
Patent
1977-01-27
1978-10-24
Vertiz, O. R.
Chemistry of inorganic compounds
Silicon or compound thereof
Binary compound
C01B 3306
Patent
active
041221524
ABSTRACT:
A process for preparing silicon nitride powder having a high .alpha.-phase content which comprises the steps of (a) providing a blended powder material composed of silica powder and amorphous carbon powder having an oil absorption of not less than 100 ml/100g, the weight ratio of the carbon powder to the silica powder being not less than 0.5, and then (b) nitriding and burning the blended powder material by heating in at a temperature of from 1300.degree. to 1700.degree. C while feeding a nitrogen-containing, non-oxidizing gas. The product obtained by this process is suitable as a raw material for the manufacture of high-density and high-strength sintered articles of silicon nitride.
REFERENCES:
patent: 928476 (1909-07-01), Larsen
patent: 3244480 (1966-04-01), Johnson et al.
patent: 3839541 (1974-10-01), Lumby et al.
patent: 3959446 (1976-05-01), Mazdiyasni et al.
Komeya et al., "Synthesis of the .alpha.-form of Silcon Nitride from Silica" (Toshiba Res. Dev. Cent., Tokyo Shibaura Electr. Co., Ltd., Kawasaki, Japan), J. Mater. Sci. 1975, 10(7), 1243-1246, (Eng.) (Chem. Abs.).
Mori Masaaki
Takai Norihira
Toshiba Ceramics Co. Ltd.
Vertiz O. R.
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