| 摘要 |
PROBLEM TO BE SOLVED: To provide a cutting tool made of surface coated super hard material exhibiting excellent high temperature heat conductivity. SOLUTION: In this cutting tool made of surface coated super hard material, the surface of a substrate composed of a WC group super hard alloy or a TiCN cermet is provided with (a) a Ti compound layer composed of one or more than two layers out of a titanium carbide layer, a titanium nitride layer and a titanium carbide and nitride layer, which have average layer thickness 0.1 to 5μm in either case, and satisfy that v is 0.8 to 1.2, and w is 0.3 to 0.7 in terms of an atomic ratio when their composite formulae are represented by TiCv, TiNv, and Ti(C1-w, Nw)v, and with a composite oxide layer having average layer thickness 0.1 to 10μm in either case, and satisfying that x is 0.01 to 0.3, and y is 1 to 2 in terms of an atomic ration when its composite formula is represented by (Al1-xMx)Oy (where, M indicates a coexistent constituent composed of one or more than two kinds out of Ti, Zr, Hf and Si). A hard coated layer formed of (a) and (b) is physically deposited so as to be 0.5 to 20μm in the whole average layer thickness.
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