COATED CEMENTED CARBIDE MEMBER AND METHOD FOR PRODUCING RARE EARTH ELEMENT-CONTAINING CEMENTED CARBI

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PROBLEM TO BE SOLVED : To obtain and to provide a coated cemented carbide member having excellent wear resistance, heat resistance and plastic deformation resistance, and further having excellent strength and toughness as well; and to provide a method for producing a rare earth element-containing cemented carbide in which a rare earth element originally easy to be oxidized is incorporated into a bonding phase without substantially oxidizing the same. SOLUTION : The coated cemented carbide member is characterized in that : the average grain diameter of WC in cemented carbide is ≥1.5 μm; a rare earth element is incorporated into a bonding phase; and the content of oxygen in the region where the rare earth element is present is 0 to 5 mass%. Further, the method for producing a rare earth element-containing cemented carbide is characterized in that, the powder of an alloy in which the molar ratio between the rare earth element and the Co is 1 : 2 to 1 : 8.5 and the content of oxygen is 0.01 to 1 mass% as well is used as a raw material powder for a rare earth element. COPYRIGHT : (C)2007, JPO&INPIT