Coated cemented carbide body and method for use

Abstract

A coated sintered cemented carbide body includes a cemented carbide body, a first layer adjacent the cemented carbide body, the first layer including Ti(C,N) and having a thickness of from about 3 to about 20 μm, an alumina layer adjacent said first layer, the alumina layer including α-Al2O3 or κ-Al203 and having a thickness of from about 1 to about 15 μm, and a further layer adjacent the aluminum layer of a carbide, carbonitride or carboxynitride of one or more of Ti, Zr and Hf, the further layer having a thickness of from about 1 to 15 μm. A friction-reducing layer, including one or more of γ-A12O3, κ-Al203 and nanocrystalline Ti(C,N) and having a thickness of from about 1 to about 5 μm, can be adjacent to the further layer. A method to cut steel with a sintered cemented carbide body where the alumina is α-Al2O3 and a method to cut cast iron with a sintered cemented carbide body where the alumina is α-Al2O3.

Dependencies are inferred from the claim text.