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:
May. 16, 1989
Filed:
Apr. 07, 1988
Yasuro Taniguchi, Kawasaki, JP;
Ko Sasaki, Kawasaki, JP;
Mitsuo Ueki, Kawasaki, JP;
Keiichi Kobori, Kawasaki, JP;
Toshiba Tungaloy Co., Ltd., Kawasaki, JP;
Abstract
There are disclosed a surface refined sintered alloy body which comprises a hard phase containing at least one selected from the group consissting of carbides, carbonitrides, carbooxides, carbonitrooxides of the metals of the groups 4a, 5a and 6a of the periodic table and a binding phase containing at least one selected from iron group metals, characterized in that the concentration of the binding phase in the surface layer (of from 10 .mu.m to 500 .mu.m from the surface of the sintered alloy) is highest at the outermost surface thereof and approaches the concentration of the inner portion, the concentration of the binding phase decreasing from the outermost surface to a point at least 5 .mu.m from the surface; and a method for making the same by applying decarburization treatment at the surface of the sintered alloy at temperatures within the solid-liquid co-existing region of the binding phase after sintering or in the process of sintering.