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:
Apr. 09, 1991
Filed:
Mar. 21, 1989
Applicant:
Inventors:
Syuusaku Ueda, Harunamachi, JP;
Masayuki Fujimoto, Takasaki, JP;
Assignee:
Taiyo Yuden CO., Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C04B / ;
U.S. Cl.
CPC ...
501 96 ; 501 97 ; 501 98 ;
Abstract
There is first prepared a mixture of a nitride ceramic material (e.g. aluminum nitride) and a sintering aid (e.g. calcium carbonate), both in finely divided form. Admixed with a binder, the mixture is pressed into moldings of desired shape. The moldings are sintered to maturity in a nitrogenous atmosphere. The sintered moldings are subsequently aftertreated by being exposed to fluorine or its compound at a reduced temperature in the range of, typically, 1000.degree. to 1600.degree. C. The aftertreatment eliminates undesired intergranular substances from the sintered moldings and thus improves their thermal conductivity.