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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.:

US 10233793 B1

PDFFull Text
Date of Patent:
Mar. 19, 2019

Filed:

Feb. 10, 2015

Valve seat of sintered iron-based alloy

Applicant:

Kabushiki Kaisha Riken, Tokyo, JP;

Inventors:

Akiko Shimada, Kumagaya, JP;

Hiroji Henmi, Kumagaya, JP;

Assignee:

KABUSHIKI KAISHA RIKEN, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Craig J Price

Assistant Examiner:

Andrew J Rost

Int. Cl.
CPC ...
F01L 3/02 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/52 (2006.01); C22C 38/60 (2006.01); C22C 32/00 (2006.01); C22C 33/02 (2006.01); B22F 3/12 (2006.01); B22F 5/00 (2006.01); B22F 7/00 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01);
U.S. Cl.
CPC ...
F01L 3/02 (2013.01); B22F 3/12 (2013.01); B22F 5/008 (2013.01); B22F 7/008 (2013.01); C22C 32/00 (2013.01); C22C 33/0285 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/52 (2013.01); C22C 38/60 (2013.01); B22F 2301/35 (2013.01); B22F 2302/45 (2013.01); B22F 2998/10 (2013.01); F01L 2101/00 (2013.01); F01L 2103/00 (2013.01);
Abstract

The present invention provides a valve seat of a Co-free, sintered iron-based alloy having excellent heat resistance, oxidation resistance and wear resistance, as well as excellent machinability, which is usable for internal combustion engines using a gas fuel. The valve seat is produced by using a prealloy containing 12% or more by mass of Cr in a matrix for, and hard particles having high strength and hardness at high temperatures are used, such that the entire valve seat has a composition comprising by mass 5.0-20.0% of Cr, 0.4-2.0% of Si, 2.0-6.0% of Ni, 5.0-25.0% of Mo, 0.1-5.0% of W, 0.5-5.0% of V, 1.0% or less of Nb, and 0.5-1.5% of C, the balance being Fe and inevitable impurities.

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