| 摘要 |
PROBLEM TO BE SOLVED: To provide a cutting tip out of a surface coated super hard alloy, the hard coated layer of which exhibits excellent initial conformity. SOLUTION: In this cutting tip made out of a surface coated super hard alloy, the surface of a WC group super hard alloy substrate is provided with (a) the inner layer of a Ti compound layer having average layer thickness 1.5 to 20μm, and composed of one or more than two kinds out of a TiC layer, a TiN layer, a TiCN layer, a Ti2O3 layer, a TiCO layer, TiNO layer and a TiCNO layer, and with (b) an outer layer having average layer thickness 1 to 20μm, and formed out of a tenacious and lubricant zone having a texture wherein 1 to 15 wt.% free carbon (less than 20 wt.% the total of ZdrO2 and free carbon) is dispersed and distributed, similar to the case of 1 to 15 wt.% ZrO2, in the bare material of Al2O3 at the surface side over to a depth equivalent to 10 to 40% of average layer thickness 1 to 20μm from the surface at the occupation rate of Al2O3 to the total amount including Al2O3, and of the remaining at the substrate side substantially composed of Al2O3, and (c) the mostouter layer of the TiN layer having average layer thickness 0.1 to 5μm, is provided when the occasion demands. And a hard coated layer formed of (a) and (b) is chemically and/or physically deposited so as to be of average layer thickness 3 to 35μm.
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