| 摘要 |
PURPOSE:To provide a tool made of alumina coated sintered hard alloy having improved anti-wear property, by coating the surface of a sintered hard alloy substrate with amorphous alumina. CONSTITUTION:The substrate surface of a sintered hard alloy is coated with amorphous alumina at a temp. range of about 900 deg.C or less by a plasma CVD method or an ion plating method to form an alumina coating layer with a thickness of about 0.5-20mum in an amorphous state. By this method, a tool made of an Al2O3 coatd sintered hard alloy for high speed cutting excellent in anti-wear property and toughness compared to one prepared by the usual CVD method is obtained. |
