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:
Aug. 13, 1996
Filed:
Jun. 21, 1994
Takatoshi Oshika, Ibaraqi-ken, JP;
Mitsubishi Materials Corporation, Tokyo, JP;
Abstract
A cutting tool whose surface is coated with a composite hard layer formed by chemical vapor deposition and having excellent wear resistance and chipping resistance. The cutting tool contains a substrate whose surface is coated with a composite hard layer containing an inner layer including one or more layers of titanium carbide, titanium nitride, titanium carbonitride, titanium carboxide, and titanium oxicarbonitride, and an outer layer including at least one alumina layer. The alumina layer contains K-type alumina such that an X-ray intensity ratio I.sub.A /I.sub.B of two specific crystal faces A and B in X-ray diffraction is not smaller than 2, where the A-face and B-face denote faces of K-type alumina defined as those whose interfacial distances are 2.79.ANG. and 2.57.ANG. in ASTM4-0878, and I.sub.A and I.sub.B denote X-ray intensity of the faces A and B in X-ray diffraction.