| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface-coated cermet cutting tool with a hard coating layer having excellent chipping resistance. SOLUTION: This surface-coated cermet cutting tool is formed by forming the hard coating layer constituted of the following (a) and (b) : (a) a Ti compound layer having the total average layer thickness of 3 to 20μm, composed of one layer or two layers among a TiC layer, a TiN layer, a TiCN layer, a TiCO layer and a TiCNO layer whose both are formed by chemical deposition as a lower layer, and (b) a heat-transformrdαtype Al oxide layer having the average layer thickness of 1 to 15μm, formed by transforming a crystal structure of an Al-based oxide layer having aκtype orθtype crystal structure into anαtype crystal structure in a state of being formed by chemical deposition as an upper layer, on a surface of a tool base body composed of WC group cemented carbide or TiCN group cermet. COPYRIGHT: (C)2005,JPO&NCIPI
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