Iron-based sintered alloy material for valve seat and valve seat made of iron-based sintered alloy

摘要

An iron-based sintered alloy material for a valve seat, in which hard particles are dispersed in a base matrix phase, is characterized in that the base matrix phase is comprised of 5 to 40 vol. % of a pearlite phase and 10 to 40 vol. % of a high-alloy diffused phase and particles having hardness of Hv 600 to 1300 and particle diameter of 10 to 150 mum are dispersed as the hard particles, by the amount of 10 to 30 vol. %, in the base matrix phase. The hard particles are preferably at least one type of particles selected from the group consisting of intermetallic compound particles of Mo-Ni-Cr-Si-Co; intermetallic compound particles of Cr-Mo-Co; Fe-Mo alloy particles; and carbide-precipitated particles.