Use of permeable materials to improve hot pressing process
AssigneeW. R. Grace & Co.-Conn.
InventorsJack H. Enloe, John W. Lau
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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.
Claims18
In a method of sintering a green body by hot pressing wherein said green body contains ceramic grains to be sintered and material capable of existing as an intergranular phase material during said sintering, the improvement comprising hot pressing said body in the presence of a permeable graphite material adapted to receive t least a portion of said intergranular phase material whereby at least a portion of said intergranular material is received by said permeable graphite material as said sintering takes place.
Dependencies are inferred from the claim text.