Patent ID: 7097901
Filing Date: 2006-08-29
Classification: C23C,Y10T

Abstract:
1. A cutting tool insert for turning of cast irons and low alloyed steels, comprising a cemented carbide body and a coating, said body having a composition of from about 3.0 to 8.0 wt. % Co, from about 0.5 to 4.0 wt. % of cubic carbonitride forming elements from groups IVb and Vb of the periodic table, N, C, and WC, and a from about 5 to 40 μm thick surface zone which is binder phase enriched and nearly free of cubic carbonitride phase, with a maximum binder phase content in the surface zone of from about 1.2 to 3 by volume of the bulk binder phase content, said coating comprising: a first, innermost layer of TiC a layer of TiC at least one layer of α-Al