| 摘要 |
PURPOSE:To enhance the heat resistance and the toughness of the titled alloy, by applying an Al2O3 and/or ZrO2 layer having a predetermined thickness on the surface of a sintered alloy consisting of a predetermined hard phase and a bonding phase. CONSTITUTION:The titled alloy is formed by coating the surface of a sintered hard alloy with a thin layer with a thickness of 0.1-2mum comprising Al2O3 and/or ZrO2 directly or through an intermediate layer. The hard phase of the aforementioned sintered hard alloy comprises a transient metal belonged to the Groups IVa, Va, VIa of the Periodic Table and carbide and/or nitride of one or more of B and Si while the bonding phase comprising one or more of a metal selected from a group consisting of Fe, Co, Ni, Cr, Mo, W, Ti and Al. This surface coated sintered alloy is excellent in heat resistance and toughness. |
