| 摘要 |
PURPOSE: To provide a wear resistant ferrous sintered alloy for valve seat, capable of inhibiting the crushing and falling of hard grains from a valve seat, preventing adhesive wear, and reducing the wear of a valve seat and a valve. CONSTITUTION: This ferrous sintered alloy for valve seat is prepared by uniformly dispersing hard grains A, consisting of, by weight, 1.5-2.5% C, 38-45% Cr, 18-30% W, 5-15% Co, 0.5-3% Mo, 0.03-0.5% Ti, and the balance Fe and having 30-80μm average grain size, and hard grains B, consisting of 60-70% Mo, 0.5-2% Si, and the balance Fe and having 30-80μm average grain size, by 10-25wt.% in total into a ferrous matrix consisting of 0.5-1.5% C, 0.5-3% Ni, 0.5-2% Mo, 0.1-8% Co, 0.05-1% Mn, and the balance Fe, having a sorbitic or pearlitic structure, and also having 300-450 Vickers hardness. By this method, the sintered alloy excellent in wear resistance can be obtained. |
