Process for the manufacture of friable silicon nitride bodies

Details Process for the manufacture of friable silicon nitride bodies Process for the manufacture of friable silicon nitride bodies

C - Chemistry, Metallurgy

01

B

25/141, 23/195

C01B 21/068 (2006.01) C04B 35/00 (2006.01) C04B 35/58 (2006.01)

Patent

CA 2027493

ABSTRACT OF THE DISCLOSURE A friable silicon nitride body is prepared by infiltrating a non-friable silicon nitride body with a fluid which expands upon freezing, rapidly freezing the fluid, and thawing the fro- zen fluid. Silicon nitride flakes and chunks obtained with only light pressure on the friable body may then be final milled to a desired particle size more rapidly and with less energy input than with conventionally processed silicon nitride. The silicon nitride body may have a higher density than has previously been used to prepare silicon nitride powders, thereby preventing the generation of potentially hazardous whiskers in the final powder product. P2427APP 10/12/89

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