Patent ID: 7090914
Filing Date: 2006-08-15
Classification: C23C,Y10T

Abstract:
1. A coated cutting tool with a hard coating layer formed on a substrate, wherein the substrate comprises a binder phase comprising one or more kinds of iron-group metals and a hard phase comprising one or more substances selected from carbides, nitrides, and oxides of elements of Groups IVa, Va and VIa of the Periodic Table and solid solutions thereof, and the coating layer comprises a smooth face having a surface roughness (Rmax) of 0.2 μm or less (the reference length being 5 μm) substantially at a blade-edge ridge and in a region which extends at least 200 μm from a rake face side boundary of the ridge toward a rake face side, and extends at least 50 μm from a flank side boundary of the ridge toward a flank side.