| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface coated cemented carbide throw away tip exerting excellent wear resistance by high speed cutting. SOLUTION: This surface coated cemented carbide throw away tip is constituted by forming a hard coating on the surface of a cemented carbide body constituted of (a) a (Ti, Al) N layer which has average layer thickness of 0.5 to 10μm as an inside layer, is formed by a physical vapor deposition method and has a composition formula: (Ti1-XAlX) N (X shows 0.3 to 0.7 at an atomic ratio); and (b) aκtype Al2O3 layer which has average layer thickness of 0.1 to 5μm as an outside layer and is formed by a medium temperature chemical vapor deposition method. The cemented carbide base body is made of a sintered body of powder green compact having a composition made of Co: 5 to 14%, Cr3C2: 0.1 to 2% and VC: 0.1 to 2% and one kind or two or more kinds of TiC, NbC, TaC, (Nb, Ta) C and (Ti, W) C: 0.5 to 25% and WC: remnants as necessary, in mass %.
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