Heat resistant coated member, making method, and treatment using the same

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A coated member comprising a substrate of Mo, Ta, W, Zr or carbon and a coating of rare earth-containing oxide including a surface layer having a Vickers hardness of at least 50; or a coated member comprising a substrate having a coefficient of linear expansion of at least 4×10−6 (1/K) and a coating of rare earth-containing oxide thereon is heat resistant and useful as a jig for use in the sintering of powder metallurgical metal, cermet and ceramic materials.