| 摘要 |
PROBLEM TO BE SOLVED: To improve both of resistance against a shock of a cutting tool forming a hard covered layer by covering it with a TiN layer in contact with a cemented carbide base material and an Al2O3 layer on outer side of the TiN layer and resistance against peeling between each layer of the hard covered film. SOLUTION: This cutting tool is constituted by forming the hard covered film on a surface of the cemented carbide base material composed of a binder phase composed of at least one kind of a hard phase component selected from the group of carbide, nitride, and carbon-nitride of elements of group 4a, 5a, 6a on the periodic table and at least one kind of iron family element using WC as a main component. The hard covered layer is constituted of multiple layers formed by covering with the TiN layer in contact with the base material and the Al2O3 layer on outer side of the TiN layer and having a film thickness of 1 to 10μm. A thickness of the TiN layer in contact with the base material is larger than that of the Al2O3 layer.
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