| 摘要 |
PROBLEM TO BE SOLVED: To provide a cutting tool made of surface coated cemented carbide alloy a hard coating layer of which displays excellent abrasion resistance in high speed cutting work of a highly reactive work material. SOLUTION: This cutting tool is made by forming the hard coating layer, on the surface of a carbide substrate by vapor deposition, which is constituted of: (a) an upper layer and a lower layer both of which are made of (Ti, Al, Ta)N, the upper layer has layer thickness of 0.5 to 1.5μm and the lower layer has layer thickness of 2 to 6μm respectively; (b) the upper layer has an alternately laminated structure of a thin layer A and a thin layer B both of which have layer thickness of 5 to 20 nm (nanometer), the thin layer A is made of a (Ti, Al, Ta)N layer to satisfy a specific composition formula, [Ti<SB>1-(A+B)</SB>Al<SB>A</SB>Ta<SB>B</SB>]N, the thin layer B is made of a (Ti, Al, Ta)N layer to satisfy a specific composition formula, [Ti<SB>1-(C+D)</SB>Al<SB>C</SB>Ta<SB>D</SB>]; and (c) the lower layer having a single phase structure and made of a (Ti, Al, Ta)N layer to satisfy a specific composition formula, [Ti<SB>1-(E+F)</SB>Al<SB>E</SB>Ta<SB>F</SB>]N. COPYRIGHT: (C)2006,JPO&NCIPI
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