| 摘要 |
PROBLEM TO BE SOLVED: To prevent the separation of a hard coating layer by using a hard base composed of specific wt.% of Co and Cr and/or V as the binder phase formation components, and a remained wt.% of WC and an unavoidable impurity as the dispersion phase forming components, and forming the very fine particles structure of a specific average size of WC. SOLUTION: A hard base includes 5-20 wt.% of Co, and 0.1-2 wt.% of Cr and/or V as the binder phase forming components, further includes WC and an unavoidable impurity as the dispersion phase forming components as residue, and has a fine structure of 0.1-1.5μm of average particle size, of WC. The distribution depth of COa Wa C of a surface layer formed by the high temperature heating, is determined to be 0.1-2μm. A hard coating layer of 0.5-4.5μm of average layer thickness composed of a Ti compound layer formed by at least one kind of a TiC layer, a TiN layer, a TiCN layer, a TiCO layer, a ToNO layer, and a TiCNO layer, or a Ti compound layer and Al2 O3 layer, respectively formed by the pyrochemical vapour phase evaporation, is formed on the surface of the hard base.
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