Synthesis of fine-grained .alpha.-silicon nitride by a combustio

Details Synthesis of fine-grained .alpha.-silicon nitride by a combustio Synthesis of fine-grained .alpha.-silicon nitride by a combustio

1988-09-19

1990-07-31

Doll, John

Chemistry of inorganic compounds

Silicon or compound thereof

Binary compound

264 65, 501 97, C01B 21063, C01B 3306

Patent

active

049449303

ABSTRACT:
A combustion synthesis process for the preparation of .alpha.-silicon nitride and composites thereof is disclosed. Preparation of the .alpha.-silicon nitride comprises the steps of dry mixing silicon powder with an alkali metal azide, such as sodium azide, cold-pressing the mixture into any desired shape, or loading the mixture into a fused, quartz crucible, loading the crucible into a combustion chamber, pressurizing the chamber with nitrogen and igniting the mixture using an igniter pellet. The method for the preparation of the composites comprises dry mixing silicon powder (Si) or SiO.sub.2, with a metal or metal oxide, adding a small amount of an alkali metal azide such as sodium azide, introducing the mixture into a suitable combustion chamber, pressurizing the combustion chamber with nitrogen, igniting the mixture within the combustion chamber, and isolating the .alpha.-silicon nitride formed as a reaction product.

REFERENCES:
patent: 4446242 (1984-05-01), Holt
patent: 4459363 (1984-07-01), Holt
patent: 4596781 (1986-06-01), Carpenter

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