发明名称 |
VALVE SEAT |
摘要 |
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 (Fe3O4) 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. |
申请公布号 |
US2016333456(A1) |
申请公布日期 |
2016.11.17 |
申请号 |
US201615219594 |
申请日期 |
2016.07.26 |
申请人 |
TPR CO., LTD. |
发明人 |
KOYAMA Yoshio;HARA Shohtaroh |
分类号 |
C23C8/14;C22C32/00;F01L3/02;C21D6/00;B22F5/00;C22C38/10;C21D9/00 |
主分类号 |
C23C8/14 |
代理机构 |
|
代理人 |
|
主权项 |
1. A manufacturing method for a valve seat to be installed on a cylinder head of an internal combustion engine,
the manufacturing method comprising subjecting an iron-based sintered alloy comprising: 4 mass % to 15 mass % of Co particles each having a Co component purity of 99 mass % or more; and 5 mass % to 45 mass % of hard particles each having a hardness of from 600 HV to 1,600 HV and comprising Co-based alloy particles to oxidation treatment, to thereby manufacture a valve seat comprising an iron-based sintered alloy subjected to oxidation treatment, which has an oxide mainly comprising triiron tetraoxide (Fe3O4) and cobalt oxide (CoO) formed on a surface or in an interior of the iron-based sintered alloy, and which 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. |
地址 |
Tokyo JP |