Wenderoth, Lind & Ponack
Process for production of coated super-hard alloy articles
 A cutting tool or a wear-resistant mechanical part comprises: a substrate of WC, Co, TiC, and TaC with or without an inner coating layer of TiC, TiN or TiCN; an intermediate layer of a titanium oxycarbide formed on the surface of the substrate or the inner coating layer by carrying out a reaction thereon at a temperature of 800.degree. to 1,200.degree. C. of a halide of titanium, hydrogen, and carbon monoxide or carbon dioxide or a mixture thereof; and an outer coating layer of aluminum oxide formed on the outer surface of the intermediate layer. The thicknesses of the inner layer, the intermediate layer, and the outer coating layer are of the order of 0.5 to 20 microns, 0.5 to 20 microns, and 0.5 to 10 microns, respectively. 
Mitsubishi Kinzoku Kabushiki Kaisha
B C Y Y Y Y C
B23B C23C Y10T Y10T Y10T Y02T C23C
inventional inventional additional additional additional additional inventional
Noribumi Yasuo Fumio Taijiro
Kikuchi Suzuki Washizu Onishi