Patent ID: 8236411

Claim:
A cutting tool comprising: a substrate; and a coating layer on the substrate comprising: a first layer comprising Ti 1-a-b-c-d Al a W b Si c M d (C 1-x N x ) (wherein M is at least one selected from Nb, Mo, Ta, Hf, and Y, 0.45≦a≦0.55, 0.01≦b≦0.1, 0≦c≦0.05, 0.01≦d≦0.1, and 0≦x≦1); and a second layer comprising Ti 1-e-f-g Al e Si f M′ g (C 1-y N y ) (wherein M′ is at least one selected from Nb, Mo, Ta, Hf, and Y, 0.50≦e≦0.60, 0≦f≦0.1, 0.05≦g≦0.15, and 0≦y≦1).