The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 18, 1993
Filed:
Dec. 21, 1990
Jack H Enloe, Columbia, MD (US);
John W Lau, Gaithersburg, MD (US);
W. R. Grace & Co.-Conn., New York, NY (US);
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.