JP2957180B

A material for valve seats comprising a wear resisting sintered ferro alloy formed by dispersing particles of a high speed steel in a matrix in which hard alloy particles are dispersed. Steps for forming include mixing particles of a matrix material, carbide material and a hard alloy, and blending the mixture with high speed steel particles, pressurizing and casting the mixture after blending, then sintering them at 1000 to 1200 DEG C. In the preferred method, at least one element of Fe, C, Ni, Co, Si or Mn is included as the matrix material, and at least one element of Fe, Cr, Mo or V as the carbide material and at least one element of Fe, Cr, Mo, Co, C or W as the hard alloy are prepared. Furthermore, preferably includes the following amounts of the above mentioned elements, 0.5 to 2.0 wt% of C, 1 to 25 wt% of one or more of Cr, Mo, V, or W and 1 to 15 wt% of one or more of Co, Ni, Mn, or Si.