Preparation of silicon nitride powder by partially nitriding in

Details Preparation of silicon nitride powder by partially nitriding in Preparation of silicon nitride powder by partially nitriding in

1991-01-29

1993-08-03

Chaudhuri, Olik

Chemistry of inorganic compounds

Silicon or compound thereof

Binary compound

422142, C01B 2106

Patent

active

052326772

ABSTRACT:
Silicon nitride powder is produced in two steps, by supplying metallic silicon powder to a fluidized bed composed of silicon nitride and nitrogen or ammonia gas where primary nitriding reaction is effected until the silicon powder is nitrided to an amount of at least 50% and transferring the nitrided product from the fluidized bed into a moving bed where secondary nitriding reaction is effected for nitriding the unreacted silicon with nitrogen or ammonia gas. This method is adapted for manufacture on a commercial scale because the silicon nitride powder thus obtained is consistent and has a very high degree of nitriding and a minimal variation in quality.

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