Using nanomechanics to optimize coatings for cutting tools

Trends in high-speed machining involve operating at higher cutting speeds and under dry or minimum quantity lubrication (MQL) conditions [1], putting greater demands on the mechanical properties of the tool materials during the cutting process. To improve the quality and wear resistance of the coatings applied to cutting tools and to extend tool life, it is necessary to optimize the coating microstructure, the oxidation resistance, the thermal stability, the hot hardness, the mechanical properties, and also to expand for stable rather than unstable wear during the overall lifetime of the tool [1-7]. Since the optimum combination of coating hardness and toughness changes with the severity of the contact conditions, this can prove difcult.