METHOD OF PRODUCING SILICON NITRIDE POWDERS

摘要

4881-255 60-135,876 comb. METHOD OF PRODUCING SILICON NITRIDE POWDERS A method of producing silicon nitride powders having a high .alpha.-Si3N4 content and a fine and uniform particle size is disclosed, which comprises mixing SiO powder with C powder and, if necessary, Si powder and/or Si3N4 powder, and then firing at 1,400-1,800.degree.C in a nitriding atmosphere having N2 partial pressure of not less than 2 atmospheric pressures.