| 摘要 |
Multilayer coated cemented carbides excellent in wear resistance and toughness are provided comprising a substrate of cemented carbide, an inner layer contacted with the surface of the substrate, and an outer layer contacted with the inner layer, the inner layer being a single layer and/or laminated layers consisting of at least one member selected from the group consisting of carbides, nitrides, carbonitrides, carboxynitrides, oxynitrides, boronitrides and borocarbonitrides of Ti, and the outer layer being a multilayer with a total thickness of 5 to 20 mu m, consisting of a plurality of Al2O3 layer each having a thickness of 0.01 to 2 mu m, each consisting of an Al2O3 film in which titanium oxide is dissolved or at most 30 vol % of titanium oxide is coexistent and being respectively divided by interlayers each having a thickness of 0.01 to 2 mu m and each consisting of at least one member of the group consisting of TiC, TiN, TiCN, TiCNO, TiNO, Ti oxides Ti(B, N), Ti(B, N, C), SiC, AlN and AlON.
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