Patent ID: 7416778

Claim:
A coated cemented carbide insert comprising a cemented carbide body and a coating comprising monolayers and/or multiple and/or alternating layers, wherein said coating has a total thickness of from about 25 to about 75 μm and comprises: a first layer adjacent the cemented carbide body, the first layer including a carbide, nitride, carbonitride or carboxynitride of one or more of Ti, Zr and Hf or mixtures thereof with a thickness of from about 3 to about 30 μm, an α-alumina layer adjacent said first layer with a thickness of from about 3 to about 40 μm, a further layer adjacent the alumina layer, the further layer including a carbide, carbonitride or carboxynitride of one or more of the metals Ti, Zr and Hf or mixtures thereof with a thickness of from about 3 to about 30 μm, and a further α-alumina layer adjacent said further layer with a thickness of from about 3 to about 40 μm, and wherein the cemented carbide body has a binder phase content of less than or equal to about 6.5 wt- %.