Patent ID: 7273665
Filing Date: 2007-09-25
Classification: C23C,Y10T

Abstract:
1. A surface-coated cermet cutting tool comprising: a hard-coating layer having excellent chipping resistance, wherein the surface-coated cermet cutting tool is formed by coating, on a surface of a tool substrate made of tungsten carbide based cemented carbide or titanium carbonitride based cermet, said hard-coating layer, which comprises a lower layer (a) and an upper layer (b): (a) as the lower layer, a titanium compound layer comprising at least one or two of a titanium carbide layer, a titanium nitride layer, a titanium carbonitride layer, a titanium carboxide layer and a titanium oxycarbonitride layer, all of which are deposited by chemical vapor deposition, the titanium compound layer having a total average thickness of 3 to 20 μm, and (b) as the upper layer, a heat-transformed α-type Al oxide layer formed by carrying out a heat-transforming treatment in a state that titanium oxide particulates satisfying the composition formula: TiO