| 摘要 |
PROBLEM TO BE SOLVED: To provide a cutting tool made of a surface coating tungsten carbide group cemented carbide alloy with a hard coating layer having excellent abrasion-resistance. SOLUTION: This cutting tool is obtained by carrying out chemical vapor deposition and/or physical vapor deposition on a hard coating layer having 5 to 25μm thickness in total average. The hard coating layer is composed of (a) a Ti compound layer consisting of a TiC layer, a TiN layer and a TiCNO layer which all have thickness of 0.1 to 5μm in average as well as granular crystalline structures, respectively. Further, the hard coating layer includes (b) a Ti-Zr-based carbonitride layer consisting of a ZrCN thin layer having a longitudinal grown crystalline structure, a TiCN thin layer having the longitudinal grown crystalline structure on the surface side, a (Ti, Zr) CN layer which is an intermediate main body layer sandwiched therebetween and similarly has the longitudinal grown crystalline structure. In addition, the Ti-Zr system carbonitride layer has the longitudinal grown crystalline structure extending from the (Ti, Zr) CN layer to the TiCN thin layer and has an average layer thickness of 5 to 15μm in these three layers. Furthermore, the hard coating layer has (c) an Al2O3 layer having a layer thickness of 0.5 to 10μm in average and the granular crystalline structure, and these layers are laminated on a tungsten carbide cemented alloy substrate.
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