PURPOSE: To improve wear resistance, by a method wherein the sintered material of carbide and nitride having an excellent heat conductivity is used as a base metal which has the less amount of a metal than the previous one and shows smaller plastic deformation under high humidity and high pressure.
CONSTITUTION: The base metal of a surface coating cutting tool is an alloy represented by a molecular formula of [TiA(W and/or Mo)B](CuNv)Z and A+B=1, u+v=1, 0.8≤Z≤1.0, 0.2≤A≤0.80, 0.20≤B≤0.80, 0.50≤u≤0.95, 0.05≤v≤0.50 and having a WC phase and an NaCl type crystallographic structure present in a texture. If 1 type or 2 types of Ta and Nb are substituted for 30atom% or less of Ti in a carbon compound, high temperature strength of a base metal alloy can be improved.
TAKAHASHI KUNIHIRO
DOI AKIRA
