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:
Feb. 22, 1983
Filed:
Jun. 29, 1981
Junichiro Suzuki, Aichi, JP;
Hiroshi Tanaka, Aichi, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A method of making a coated tip for cutting purposes having a lower degree of flank and crater wear and reduced chipping. A WC-based ultrahard alloy containing WC, at least one nitride selected from among TiN, TaN and NbN and a bonding metal is heat treated at a temperature of 800.degree. C. to 1,300.degree. C. in a nitrogen atmosphere for a sufficiently long period of time to cause nitride in a layer in the vicinity of the surface of the alloy to move to the surface to form a layer of nitride thereon as well as an alloy layer of WC and the bonding metal in which the nitride has been reduced. The surface of the tip is then coated with a layer of Al.sub.2 O.sub.3.