| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve seat made from an iron-based sintered alloy of excellent abrasion resistance and machinability, usable in an exhaust valve seat of an internal combustion engine suitable for low fuel consumption, low emission, and a high output.SOLUTION: Abrasion resistance and machinability are both improved by using a pre-alloy powder of a low alloy with high compressibility and high sinterability without using a pre-alloy powder of a high alloy and further dispersing hard particles to form an alloy diffusion phase extending from the hard particles to a matrix structure comprised of the pre-alloy powder of the low alloy at a time of sintering. |
