| 摘要 |
PROBLEM TO BE SOLVED: To provide a covered cemented carbide cutting tip with a hard covering layer having excellent interlayer adhesion. SOLUTION: The covered cemented carbide cutting tip is formed by chemically depositing and/or physically depositing (a) a TiN layer having the average layer thickness of 0.1 to 2μm and a granular crystal structure as a first layer from the base body side, (b) a TiCN layer having the average layer thickness of 3 to 15μm and a longitudinally long growth crystal structure as a second layer, (c) a TiCN layer having the average layer thickness of 0.5 to 8μm and a granular crystal structure as a third layer, (d) a (Ti, Al) CNO layer having the average layer thickness of 0.3 to 3μm and a granular crystal structure as a fourth layer and having the component concentration distribution of continuously and/or intermittently gradually reducing a Ti, C and N component being a constitutive component and continuously and/or intermittently gradually increasing in an Al and O component being simularly the constitutive component along the layer thickness toward an upper side interface with an Al2O3 layer of a fifth layer from a lower side interface with the TiCN layer of the third layer and (e) the hard covering layer composed of the Al2O3 layer having the average layer thickness of 1 to 8μm and a granular crystal structure as the fifth layer on a surface of a WC group cemented carbide base body.
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