| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an iron-based sinter alloy valve sheet excellent in heat resistance, oxidation resistance and abrasion resistance as well as machinability and capable of being used for a valve sheet of an internal combustion engine using fuel gas even without containing Co.SOLUTION: An oxidation resistant film excellent in adhesiveness is formed by using a hard particle consisting of 12 mass% or more of Cr and forming a diffusive phase between matrix phases, and making a composition of the whole sintered body consisting the hard particle, the matrix phase and the diffusive phase with, by mass%, Cr:3.0 to 8.0%, Si:0.4 to 2.0%, Ni:4.0 to 10.0%, Mo:3.0 to 8.0%, V:0.5 to 5.0%, Nb:0.2 to 1.0%, C:0.5 to 1.5% and the balance Fe with inevitable impurities and excellent abrasion resistance from a low temperature range to a high temperature range is improved.</p> |
