| 摘要 |
PURPOSE:To obtain a ferrous sintered alloy for valve seat excellent in wear resistance and reduced in the attack upon a valve as opposite material, by uniformly dispersing alloy grains into an iron matrix mainly composed of pearlite. CONSTITUTION:The alloy grains have a composition consisting of, by weight, 10-17% Cr, 5-20% W, 2-20% V and/or Nb, <20% Fe, 0.5-3% C, and the balance Co. The above alloy grains are uniformly dispersed by 5-25wt% into the matrix mainly composed of pearlite consisting of, by weight, 0.5-2% C and the balance Fe with inevitable impurities or of the one consisting of 0.5-2% C, 1-10% Ni, and the balance Fe with inevitable impurities.
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