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:
Jul. 07, 1981
Filed:
Dec. 19, 1978
Applicant:
Inventors:
Masaaki Tobioka, Itami, JP;
Mitsuo Kodama, Itami, JP;
Tsuyoshi Asai, Itami, JP;
Takaharu Yamamoto, Itami, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B22F / ; C22C / ;
U.S. Cl.
CPC ...
75238 ; 75204 ; 75211 ; 75205 ;
Abstract
This invention relates to a sintered hard metal for cutting tools and having excellent wear resistance, resistance to thermal deformation, mechanical strength and the like. The present invention resides in the fact that the substrate metal consists of a rich content of the B-1 type hard phase and the surface thin layer consists of a rich content of the ordinary tungsten carbide. B-1 type crystal structure contains one or more Group IVa, Va and VIa metals, carbon, nitrogen and, moreover, tungsten. The thin layer structure has the layer of 5 to 200.mu. thickness on the surface thereof.