Patent ID: 7150925
Filing Date: 2006-12-19
Classification: C23C,Y10T

Abstract:
1. A coated cutting tool comprising a substrate selected from the group consisting of cemented tungsten carbide and cermet comprising TiCN, (a) a crystal orientation hysteresis layer comprising a carbonitride compound layer comprising aluminum, and (b) a hard coating layer comprising a layer of nitride compound comprising a well-defined crystal orientation, degree of crystallinity, or a combination thereof; wherein (a1) the carbonitride compound layer has an average thickness of 0.05 to 0.5 μm and comprises a Ti—Al carbonitride compound layer expressed by the composition formula (Ti (b1) the nitride compound layer has an average thickness of 2 to 15 μm and comprises a Ti—Al nitride compound layer expressed by the composition formula as (Ti wherein the carbonitride compound layer and the hard coating layer are formed on the surface of the substrate by physical vapor deposition; and wherein the crystal orientation hysteresis layer is deposited between the surface of the substrate and the hard coating layer.