COATED CEMENTED CARBIDE MEMBER AND METHOD FOR PRODUCING CEMENTED CARBIDE CONTAINING RARE EARTH ELEME

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PROBLEM TO BE SOLVED : To provide a coated cemented carbide member excellent in properties of heat resistance and plastic deformation resistance by markedly improving the heat resistance and plastic deformation resistance in a binder phase of a coated cemented carbide tool etc. SOLUTION : In the coated cemented carbide member, the surface of a cemented carbide member is coated with a hard single-layer or multilayer film, and a hard-phase-depleted surface zone where the hard phase is dissipated or decreased is present over the region of 1 to 100 μm in a depth direction from the surface of the member right under the film, and further, a hard-phase-enriched intermediate zone is present over the region of 1 to 200 μm in a depth direction adjacently to the hard-phase-depleted surface zone. Moreover, in the coated cemented carbide member, rare earth elements are contained in the binder phase and the amount of oxygen in the region where the rare earth elements are present is 0 to 5 mass%. COPYRIGHT : (C)2006, JPO&NCIPI