| abstract |
Disclosed is a workpiece having a body and a wear resistant hard coating system on at least a part of the surface of said body, said system comprising at least one layer of the following composition:(Al1-a-b-c Cra Bb Zc)X where X is at least one of: N, C, CN, NO, CO, CNO; Z is at least one of: W, Mo, Ta, Cb (Nb);wherein there is valid 0.2 < a < 0.5;0.01 < b < 0.2;0.001 < c < 0.04,wherein said at least one layer exhibits a glassy growth structure in the SEM cross-section; and wherein said body being of one of high-speed steel, hardened steel, cemented carbide, cubic boron nitride, cermet and a ceramic material; and wherein the workpiece being a cutting tool of an end mill, a drill, a cutting insert and a gear cutting tool. A process for manufacturing said workpiece is also disclosed, which comprises: (a) providing said workpiece body in a plasma coating vacuum chamber, (b) applying said system to said body by a cathodic arc evaporation during a processing time, (c) establishing a temperature of at least 550 Deg. C to the surface of the coated body during at least a predominant part of said processing time. |