Use of permeable materials to improve hot pressing process

Details Use of permeable materials to improve hot pressing process Use of permeable materials to improve hot pressing process

1990-12-21

1993-05-18

Silbaugh, Jan H.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

264 86, 264125, 264338, C04B 3700, B28B 126, B29C 6700

Patent

active

052117863

ABSTRACT:
The present invention overcomes the problems caused by certain intergranular phases present during hot pressing. The invention provides a method of removing such problematic intergranular phases while avoiding problems of non-uniformity. In one aspect, the invention encompasses an improvement in a method of sintering a green body by hot pressing, where the green body contains ceramic grains to be sintered and material capable of existing as intergranular phase material during sintering. The improvement embraces hot pressing the body in the presence of a permeable material adapted to receive at least a portion of intergranular phase material as the sintering takes place or after the sintering has been completed.

REFERENCES:
patent: 4340436 (1982-07-01), Dubetsky et al.
patent: 4753694 (1988-06-01), Herron et al.
patent: 4879156 (1989-11-01), Herron et al.
patent: 4920640 (1990-05-01), Enloe et al.

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