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:
Mar. 25, 1986
Filed:
Jan. 10, 1984
Applicant:
Inventors:
Hiroshi Tanaka, Aichi, JP;
Hidetoshi Baba, Aichi, JP;
Assignee:
NGK Spark Plug Co., Ltd., Aichi, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B24D / ;
U.S. Cl.
CPC ...
51295 ; 51308 ; 51309 ; 407119 ; 501 97 ; 428698 ;
Abstract
A nitride based ceramic cutting tool is described comprising from 50 to 90% by weight Si.sub.2 N.sub.4, from 5 to 45% by weight TiN, and from 5 to 45% by weight sintering aid, said sintering aid comprising (1) at least one of Y.sub.2 O.sub.3 and Dy.sub.2 O.sub.3 and (2) Al.sub.2 O.sub.3 alone or a mixture of AlN and Al.sub.2 O.sub.3, said mixture comprising from 5 to 65% by weight AlN, and the weight ratio of (1) at least one of Y.sub.2 O.sub.3 and Dy.sub.2 O.sub.3 to (2) Al.sub.2 O.sub.3 alone or the AlN and Al.sub.2 O.sub.3 mixture being 3:1 to 1:3.