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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 9556761 B1

PDFFull Text
Date of Patent:
Jan. 31, 2017

Filed:

Sep. 05, 2013

Valve seat

Applicant:

Tpr Co., Ltd., Chiyoda-ku, Tokyo, JP;

Inventors:

Yoshio Koyama, Tokyo, JP;

Shohtaroh Hara, Tokyo, JP;

Assignee:

TPR CO., LTD., Tokyo, JP;

Attorney:

Cantor Colburn LLP

Primary Examiner:

George Wyszomierski

Assistant Examiner:

Ngoclan T Mai

Int. Cl.
CPC ...
C22C 33/02 (2006.01); F01L 3/02 (2006.01); B22F 1/00 (2006.01); C22C 30/00 (2006.01); C22C 38/02 (2006.01); C22C 38/52 (2006.01); C22C 38/58 (2006.01); C23C 8/10 (2006.01); B22F 5/00 (2006.01);
U.S. Cl.
CPC ...
F01L 3/02 (2013.01); B22F 1/0059 (2013.01); B22F 5/008 (2013.01); C22C 30/00 (2013.01); C22C 33/02 (2013.01); C22C 33/0257 (2013.01); C22C 38/02 (2013.01); C22C 38/52 (2013.01); C22C 38/58 (2013.01); C23C 8/10 (2013.01); B22F 2301/15 (2013.01); B22F 2301/35 (2013.01); B22F 2302/10 (2013.01); C22C 33/0285 (2013.01); F01L 2101/00 (2013.01); F01L 2101/02 (2013.01); F01L 2103/00 (2013.01); F01L 2820/01 (2013.01);
Abstract

The valve seat includes an iron-based sintered alloy subjected to oxidation treatment, which is obtained by subjecting an iron-based sintered alloy including: 4 mass % to 15 mass % of Co particles; and hard particles each containing at least one compound of an intermetallic compound, a carbide, a silicide, a nitride, or a boride that has one or more kinds of elements selected from group 4a to 6a elements in a periodic table, and having a hardness of from 600 HV to 1,600 HV to oxidation treatment, and which has an oxide mainly including triiron tetraoxide (FeO) and cobalt oxide (CoO) formed on a surface and in an interior of the iron-based sintered alloy. The iron-based sintered alloy subjected to oxidation treatment has an area ratio of the oxide of from 5% to 25% in a cross section thereof in a state prior to installation on the cylinder head.

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