Development of new coating film having both high adhesion and high abrasive-wear-resistance for cutting tools

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In cutting, coated cemented carbide tools seem to be effective tool materials. TiN or (Ti, Al) N are generally used as the coating film. A titanium-tungsten based coating films have been developed. The titanium-tungsten based coating films exhibited a superior critical scratch load. However, the hardness of the titanium-tungsten based coating films were lower than that of (Ti, Al) N coating film. So, titanium-tungsten-silicon based coating films, namely (Ti, W, Si) N, (Ti, W, Si) C or (Ti, W, Si) (C,N) coating film, have been developed. These newly titanium-tungsten-silicon based coating films exhibit both superior critical scratch load and hardness as compared with TiN, (Ti, Al) N coating film.