| 简介 |
A surface coated tool including a substrate, and stacked layers composed of two coating layers represented by the following general formula (1) on the substrate is provided. A first coating layer to be coated on the surface of the substrate, which has a thickness of 0.1 to 1 μm, is composed of a granular crystal having a mean crystal diameter of 0.01 to 0.1 μm. A second coating layer to be coated on the surface of the first coating layer, which has a thickness of 0.5 to 5 μm, is composed of columnar crystal grown in a direction perpendicular to the substrate, and the columnar crystal has a mean crystal width of 0.05 to 0.3 μm in a direction parallel to the substrate while a mean crystal width thereof is larger than the mean crystal diameter of the first coating layer. [Formula 3]
[in-line-formulae]M1-aAla(CbN1-b) (1)[/in-line-formulae]wherein, M represents at least one metal element selected from the group consisting of the elements of Groups 4, 5 and 6 of the periodic table, Si and rare earth elements, “a” satisfies the relation of 0.25≦a≦0.75, and “b” satisfies the relation of 0≦b≦1. |
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