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AssigneesRiken, Nissan Motor Co., Ltd.
InventorsAkiyoshi Ishibashi, Kazutoshi Takemura, Makoto Abe, Akira Fujiki, Kimitsugu Kiso, Takaaki Ito
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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 compacting the mixture after blending, then sintering them at 1000.degree. to 1200.degree. 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, the ferro alloy 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.
A ferro alloy comprised of
A valve seat formed by a wear resisting sintered ferro alloy, wherein said ferro alloy is comprised of
A method of forming a ferro alloy comprising the steps of:
A method of forming a valve seat comprised of a wear resisting sintered ferro alloy, comprising the steps of:
Dependencies are inferred from the claim text.