PVD AL2O3 COATED CUTTING TOOL

摘要

The present invention describes a coated CBN cutting tool for metal machining. The tool consists of one or more CBN bodies with or without cemented carbide backing. The coating is composed of one or more layers of refractory compounds of which at least one layer consists of fine-grained, crystalline gamma -phase alumina, Al2O3, with a grainsize less than 0.1 mu m. The Al2O3-layer is deposited with a bipolar pulsed DMS technique (Dual Magnetron Sputtering) at substrate temperatures in the range 450 DEG C to 700 DEG C.