Continuous preparation of silicon nitride powder

摘要

Silicon nitride powder is continuously prepared by feeding metallic silicon powder into a fluidized bed comprising silicon nitride powder and nitrogen or ammonia gas and discharging a nitrided product from the fluidized bed. The metallic silicon powder is pretreated at a temperature of 1,000 DEG -1,400 DEG C. under a vacuum of 0.001-100 Torr before it is subject to nitriding reaction.