| 摘要 |
<p>PURPOSE: To provide a coated member which exhibits excellent heat resistance, corrosion resistance, and non-reactivity when used in the sintering or heat treatment of powder metallurgical metal, cermet or ceramic materials in vacuum or an inert or reducing atmosphere, a method for preparing the coated member, and a method of heat treatment using the coated member. CONSTITUTION: The heat resistant coated member comprises a substrate made of a material selected from the group consisting of Mo, Ta, W, Zr, and carbon and a coating of rare earth-containing oxide thereon, wherein the rare earth-containing oxide coating includes a surface layer having a hardness of at least 50 HV in Vickers hardness. The method for preparing a heat resistant coated member comprises the steps of coating a substrate made of a material selected from the group consisting of Mo, Ta, W, Zr, and carbon with a rare earth-containing oxide, and heat treating the surface of the coating so that the surface has a hardness of at least 50 HV in Vickers hardness. The method of heat treating a powder metallurgical metal, cermet or ceramic material comprises the steps of placing the material on the heat resistant coated member and heat treating the material thereon. The heat resistant coated member comprises a substrate having a coefficient of linear expansion of at least 4x10¬-6(1/K) and a layer comprising rare earth-containing oxide coated thereon. The heat resistant coated member comprises a metal, carbon, or carbide, nitride or oxide ceramic substrate, an intermediate coating layer on the substrate comprising a lanthanoid oxide, an oxide of Y, Zr, Al or Si, a mixture of these oxides, or a complex oxide of these elements, and a coating layer on the intermediate coating layer comprising a complex oxide of a lanthanoid element and a Group 3B element.</p> |
