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The effects of the addition of platinum group metals Ru, Rh and Ir on the microstructure and mechanical properties of cemented carbide at room and high temperatures were investigated. It was found that the increase in hardness by the addition of platinum group elements was due to the grain growth inhibition of WC and solid solution hardening of the binder phase. Furthermore, when creep deformation resistance was investigated as a mechanical property at high temperature, it was found that the strain rate of the WC-Co with Ru, Rh and Ir were lower than that of the WC-Co alloy. As a practical test, cutting test was conducted using martensitic stainless steel, which is used as a material for turbine blades. It was found that cemented carbides containing Ru had superior plastic deformation resistance compared to alloy without Ru. [ABSTRACT FROM AUTHOR]