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. 18, 1995
Filed:
Dec. 18, 1992
Applicant:
Inventors:
Toshiya Kinoshita, Kawasaki, JP;
Hiroshi Kubo, Kawasaki, JP;
Assignee:
Nippon Steel Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428450 ; 75236 ; 501 89 ; 423345 ; 419 17 ; 419 48 ; 264 56 ; 4289122 ;
Abstract
A high purity and high density silicon carbide sintered body is made by controlling an amount of aluminum in an aluminum compound as a sintering additive from more than the solid solution upper limit in silicon carbide, preferably, as aluminum from 0.4 to 0.7% by weight of the total silicon carbide and aluminum compound. The sintered body has a density of 99.9% or more and can have a smooth surface with an average surface roughness of 2 nm or less when polished. Thus, this sintered body is suitable for producing a precise, rigid and heat resistant mirror substrate.