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. 16, 1999
Filed:
Dec. 05, 1997
Teruo Takahashi, Tochigi-ken, JP;
Takashi Kawamoto, Tochigi-ken, JP;
Nippon Piston Ring Co., Ltd., Tokyo-to, JP;
Abstract
The invention is directed to an iron series sintered alloy superior in abrasion resistance, preferably usable for slipping parts such as valve seats used in internal combustion engines, vanes in compressors and so forth. The sintered alloy is of base matrix of a mixed structure comprising the primary phase of in area ratio 30.about.95% mainly of Fe having a hardness of 400 Hv or above with precipitated fine carbide of 10 .mu.m or smaller, and the secondary phase of in area ratio 5.about.70% softer than said primary phase, consisted of pure iron or carbon steel or low alloy steel. This base matrix will include in area ratio 1.about.20% infiltrated or previously added Cu phase or Cu alloy phase, or will include dispersed therein in area ratio 1.about.20% hard particles having average diameter of 20.about.100 .mu.m and a hardnessof 700.about.1500 Hv such as Fe--Mo paricles, Cr--Mo--Co intermetallic compound particles, C--Cr--W--Co particles, etc.