Iron-based sintered alloy for valve seat, and valve seat for internal combustion engine
US8733313B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 2009 |
| Grant date | May 27, 2014 |
| Priority date | — |
| Expiry date | Jan 18, 2030 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L2301/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
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…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.