| 摘要 |
PROBLEM TO BE SOLVED: To provide a cutting tip made out of a surface coated super hard alloy exhibiting excellent initial conformity at its hard coated layer. SOLUTION: A cutting tip made out of a surface super hard alloy comprises (a) the internal 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 TiCO layer, a TiNO layer and a TiCNO layer, disposed over to the surface of a WC group super hard alloy substrate, and also comprises (b) an external layer allowing a two phase vertical striped texture zone having average layer thickness 1 to 20μm to exist, substantially composed of two phases, that is, an Al2O3 phase, and a TiNO phase at the surface side over to the depth of 10 to 40% average layer thickness 1 to 20μm, and the remainder is substantially formed out of Al2O3, wherein these two phases indicate a texture mutually elongated in a vertical strip shape in a texture observation by an electron microscope, and furthermore, its rate of the TiNO layer is 5 to 45% by area in the proportion of the whole of the Al2O3. The mostouter layer of the TiN layer having average layer thickness 0.1 to 5μm is provided with the occasion demands. A hard coated layer formed out of (a) and (b) is chemically and/or physically deposited so as to be of the whole average layer thickness 3 to 35μm.
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