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:
Sep. 25, 2007
Filed:
Mar. 03, 2005
Kenichi Sato, Shimotsuga-gun, JP;
Arata Kakiuchi, Shimotsuga-gun, JP;
Teruo Takahashi, Shimotsuga-gun, JP;
Tomoki Okita, Wako, JP;
Masahiro Takehana, Wako, JP;
Kenichi Sato, Shimotsuga-gun, JP;
Arata Kakiuchi, Shimotsuga-gun, JP;
Teruo Takahashi, Shimotsuga-gun, JP;
Tomoki Okita, Wako, JP;
Masahiro Takehana, Wako, JP;
Nippon Piston Ring Co., Ltd., Tochigi-ken, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
An iron-based sintered alloy material for a valve seat having improved wear resistance and reduced opposite aggressibility to a mating valve. The iron-based sintered alloy material contains 10% to 20% by area of first hard particles and 15% to 35% by area of second hard particles dispersed in a base matrix phase, the first and the second hard particles accounting for 25% to 55% by area in total. The first hard particles are composed of a cobalt-based intermetallic compound and have a size of 10 to 150 μm and a hardness of at least 500HV0.1 and less than 800HV0.1. The second hard particles are composed of a cobalt-based intermetallic compound and have a size of 10 to 150 μm and a hardness of at least 800HV0.1 and less than 1100HV0.1. Solid lubricant particles may also be dispersed in the base matrix phase.