Patent ID: 6632514
Filing Date: 2003-10-14
Classification: C23C,Y10T

Abstract:
A cutting tool insert comprising a cemented carbide body and a coating, said coating includes a multi-layer coating with a total thickness varying from 2 &mgr;m to 20 &mgr;m, said coating being composed of &kgr;-Al2O3 layers with a thickness of 0.1-0.4 &mgr;m, and TiN or Ti(C,N) layers with a thickness of 0.3 to 0.6 &mgr;m; and that said cemented carbide body comprising WC with a mean intercept length of 0.5-0.9 &mgr;m, 9.0-10.9 wt-% Co and 0.5-2.5 wt-% TaC+NbC with a ratio of the weight concentrations of Ta and Nb of 7.0-12.0, and a binder phase with an S-value of 0.81-0.92.