| 摘要 |
PROBLEM TO BE SOLVED: To provide a cutting tip made of a surface coated super hard alloy exhibiting excellent tipping resistance at its hard coated layer. SOLUTION: In this cutting tip made 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 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, a TiNO layer, and TiCNO layer, and with (b) an external layer having average layer thickness 1 to 20μm, and allowing a tenacious zone having a texture to exist, wherein 0.5 to 7 wt.% ZrO2 is dispersed and distributed at the surface side over to a depth equivalent to 10 to 30% of average layer thickness 1 to 20μm from the surface in the bare surface of Al2O3 at the rate of Al2O3 with respect to the total amount, and the remaining at the substrate side is substantially composed of Al2O3, and (c) the mostouter layer of the TiN layer having average layer thickness 1 to 5μm is provided when the occasion demands. A hard coated layer formed of (a) and (b) is chemically and/or physically deposited so as to be 3 to 35μm in the whole average layer thickness.
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