发明名称 |
liga sinterizada baseada em ferro para sede de válvula e sede de válvula para motor de combustão interna |
摘要 |
It is an object of the present invention to provide a valve seat product in which the amount of hard particles added to improve the wear resistance of a valve seat of an internal combustion engine is increased, and is excellent in the mechanical strength and machinability. In order to achieve the object, an iron-based sintered alloy material for a valve seat is employed which is made to contain a first hard particle having an average primary particle diameter of 5 to 20 μm and a second hard particle having an average primary particle diameter of 20 to 150 μm in a texture, wherein a particle size distribution curve measured by laser diffraction scattering analysis has N peaks (N is an integer equal to or larger than 2) and when particle diameters corresponding to the peak top positions are denoted as DT1 to DTN, a peak top particle diameter difference between neighboring DTn-1 and DTn(|DTn-1−DTn|: n is an integer equal to or larger than 2 and equal to or smaller than N) is in the range of 15 to 100 μm in at least one neighboring DTn-1 and DTn; and the total area ratio occupied by both of the first hard particle and the second hard particle constituting the mixed hard particle in the texture of the iron-based sintered alloy is 10 to 60% by area. |
申请公布号 |
BRPI0910437(A2) |
申请公布日期 |
2016.08.09 |
申请号 |
BR2009PI10437 |
申请日期 |
2009.03.25 |
申请人 |
NIPPON PISTON RING CO., LTD. |
发明人 |
HIROSHI OSHIGE;KENICHI SATO;TAKESHI HANIU |
分类号 |
B22F5/00;C22C19/07;C22C33/02;C22C38/00;C22C38/44;F01L3/02 |
主分类号 |
B22F5/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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