| 摘要 |
PROBLEM TO BE SOLVED: To provide a cutting tool made of a surface coated cemented carbide alloy having high chipping resistance. SOLUTION: This cutting tool made of the surface coated cemented carbide alloy is formed by physically depositing a hard coating layer made of a single layer formed of one of formulas (Ti1-XAlX)N and (Ti1-XAlX)C1-YNY (where, X is 0.1 to 0.7 and Y is 0.5 to 0.99 in atomic ratio) or a double layer formed of both of them, with an average layer thickness of 1 to 10μm, onto a surface of a tungsten carbide-based cemented carbide alloy substrate or a titanium carbonitride-based cermet substrate. A Ti oxide layer having average thickness of 0.1 to 3μm represented by the formula TiOV (where, V is atomic ratio to Ti and satisfies 1.2 to 1.7) as the outermost ground layer, and a Ti oxynitride layer having average thickness of 0.05 to 2μm represented by the formula TiN1-Z (O)Z (where, (O) is diffusion oxygen from the outermost ground layer and Z is atom ratio to Ti and satisfies 0.01 to 0.4) as the outermost layer are chemically and/or physically deposited.
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