Patent ID: 7470296

Claim:
A cutting tool including a body and a coating, said coating comprising: a first (innermost) layer system of at least two layers of TiC x N y O z with x+y+z≦1 with a total thickness of from about 0.7 to about 4.5 μm, a second layer system consisting of a single Al 2 O 3 -layer, an outermost layer system comprising one or several layers in sequence of TiC x N y (x+y≦1), with individual thicknesses of greater than about 0.15 to about 0.8 μm, adding up to a total thickness of greater than about 0.6 to about 2.0 μm and a layer with Al 2 O 3 with a thickness greater than about 0.1 to about 0.4 μm adding up to total thickness of the outermost layer system thinner than about 2.5 μm, with the total thickness of the coating in the range from about 2.0 to about 12.0 μm.