SURFACE COATED TUNGSTEN CARBIDE GROUP CEMENTED CARBIDE CUTTING TOOL HAVING PHYSICALLY DEPOSITING HARD COATING LAYER WITH EXCELLENT CHIPPING RESISTANCE

摘要

PROBLEM TO BE SOLVED: To provide a surface coated WC group cemented carbide cutting tool having a physically depositing hard coating layer with excellent chipping resistance.;SOLUTION: In the surface coated WC group cemented carbide cutting tool made by physically depositing the hard coating layer constituted of a lower layer having average thickness of 0.1 to 10 μm and an upper layer having average thickness of 0.5 to 10 μm on the surface of a WC group cemented carbide substrate, the physically depositing lower layer is made of a Ti compound layer made of one kind or not less than two kinds of a TiC layer, a TiN layer, a TiCN layer, a TiCO layer and a TiCNO layer and the physically depositing upper layer is made of an Al2O3 main body layer made by substituting a part of Al in a crystal structure of Al2O3 by one kind or not less than two kinds of Ta, V, Nb, W, Mo and Cr of 5 to 20 atomic percent of the total amount with Al to bring a solid solution.;COPYRIGHT: (C)2001,JPO