Process for producing silicon nitride sliding member

Details Process for producing silicon nitride sliding member Process for producing silicon nitride sliding member

1997-08-29

1999-10-05

Fiorilla, Christopher A.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Surface finishing

264320, 264325, B29C 4900

Patent

active

059619074

ABSTRACT:
A silicon nitride ceramic sliding member which includes Si.sub.3 N.sub.4 grains as a main component and is shaped or controlled in dimensions through hot plastic working wherein the Si.sub.3 N.sub.4 particles mainly includes .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 including Si.sub.3 N.sub.4 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 Si.sub.3 N.sub.4 grains is at most 0.5 .mu.m, 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.

REFERENCES:
patent: 4946630 (1990-08-01), Ezis
patent: 5665291 (1997-09-01), Honma et al.
patent: 5776600 (1998-07-01), Katayama et al.

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