SURFACE-COATED CEMENTED CARBIDE CUTTING TOOL WITH HARD COAT LAYER EXHIBITING EXCELLENT WEAR RESISTANCE UNDER HIGH-SPEED DOUBLE CUTTING CONDITION

摘要

PROBLEM TO BE SOLVED: To provide a surface-coated cemented carbide cutting tool having a hard coat layer which exhibits excellent wear resistance under a high-speed double cutting condition. SOLUTION: On the surface of a WC-group carbide base body or titanium carbide and nitride-based cermet base, the hard coat layer 1-15μm in thickness consisting of a composite nitride of Al, Ti and Zr is formed so as to have a component concentration distribution structure in which the Al highest content point (point A) and the Ti highest content point (point B) are alternately repeatedly present at prescribed intervals along the layer thickness direction, and the Al and Ti contents are continuously changed from the point to the point B or from the point B to the point A. The point A and the point B satisfy a composition formula (Al1-(X+Y)TiXZrY)N (wherein X represents 0.05-0.30, by atomic ratio, and Y represents 0.01-0.15) and a composition formula (Ti1-(Z+Y)AlZZrY)N (wherein Z represents 0.1-0.35, by atomic ration, and Y represents 0.01-0.15), respectively, and the space between the adjacent points A and B is set to 0.01-0.1μm. COPYRIGHT: (C)2004,JPO