Silicon nitride ceramic sliding member and process for...

Details Silicon nitride ceramic sliding member and process for... Silicon nitride ceramic sliding member and process for...

C - Chemistry, Metallurgy

04

B

C04B 35/584 (2006.01) C04B 35/593 (2006.01) F01L 1/14 (2006.01) F01L 3/02 (2006.01) F16C 33/04 (2006.01)

Patent

CA 2169862

A silicon nitride ceramic sliding member which comprises Si3N4 grains as a main component and is shaped or controlled in dimensions through hot plastic working wherein the Si3N4 particles mainly comprises .beta.-type columnar crystal grains. The ceramic sliding member is produced by the step (I) of preparing a preform made of silicon nitride ceramic sintered body comprising Si3N4 grains as a main component wherein the average grain size (average grain size in minor axis in the case of .beta.-type columnar crystal grains) of the Si3N4 grains is at most 0.5 µm, and the hot plastic working step (II) of placing the preform in a mold and effecting hot plastic deformation of the preform for shaping or dimensional control thereof while simultaneously increasing the average aspect ratio of the .beta.-type columnar crystal grains. The resultant sliding member has excellent sliding properties, a high mechanical strength and a high reliability at a low cost without resort to grinding or the like for shaping thereof.

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