Process for synthesizing spinel type silicon nitride powders

Details Process for synthesizing spinel type silicon nitride powders Process for synthesizing spinel type silicon nitride powders

2006-01-03

2006-01-03

Nguyen, Ngoc-Yen (Department: 1754)

Chemistry of inorganic compounds

Silicon or compound thereof

Binary compound

C501S097100

Reexamination Certificate

active

06982070

ABSTRACT:
A large amount of spinel type silicon nitride powders of a high-pressure phase is produced by mixing raw powders having a particle size of 10 μm or less of α-, β- or amorphous silicon nitride, each of which is a low pressure phase, with non-nitrified metal powders at a ratio of 50 weight % or more, preferably copper powders with a particle size of 100 μm or less, forming a compact with porosity of 50% or less and 10% or more, preferably around 30%, by pressing mixture powders obtained, and subjecting the compact to shock wave compression treatment at a pressure of 20 GPa or more, preferably around 60 GPa.

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Zerr, A., et al. “Synthesis of cubic silicon nitride”, Nature, vol. 400 (Jul. 22, 1999), pp. 340-342.
Schwarz, M., et a. “Spinel-Si3N4:Multi-Anvil Press Synthesis and Structural Refinement”, Advanced Materials, vol. 12, No. 12 (2000), pp. 883-887.

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