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:
Nov. 26, 1991
Filed:
Dec. 21, 1989
Kei Nakahara, Tokyo, JP;
Keiichi Sakurai, Tokyo, JP;
Toshihiko Okamura, Tokyo, JP;
Hironori Yoshimura, Tokyo, JP;
Hiroyuki Eto, Omiya, JP;
Noribumi Kikuchi, Omiya, JP;
Mitsubishi Metal Corporation, Tokyo, JP;
Abstract
A tool member includes a tungsten carbide based cemented carbide substrate and a diamond coating deposited on the substrate. The substrate has two diffraction peaks K.alpha..sub.1 and K.alpha..sub.2 indexed by index of pane (211) for tungsten carbide in X-ray diffraction. The peaks satisfy the relationship of 1.sub.1 /1.sub.2 .ltoreq.35, where 1.sub.1 and 1.sub.2 are heights of the peaks K.alpha..sub.1 and K.alpha..sub.2 measured from a base of a trough between the two diffraction peaks. For manufacturing the tool member, a green compact is first sintered to provide a tungsten carbide based cemented carbide substrate. Subsequently the substrate is ground and subsequently heat-treated at a temperature between 1000.degree. C. and 1600.degree. C. in a vacuum or in a non-oxidizing atmosphere. Thereafter, a diamond coating is formed on the substrate by vapor-deposition method.