Research on tool wear mechanism shows that during high-speed cutting, the maximum blade temperature can reach 900 ℃. At this time, tool wear is not only mechanical friction wear (wear behind the tool), but also adhesive wear, diffusion wear, friction oxidation wear (tool edge wear and crescent pit wear), and fatigue wear. These five types of wear directly affect the service life of the tool.

The characteristic of the coating is that the coating film combines with the tool substrate to improve the wear resistance of the tool without reducing the toughness of the substrate, thereby reducing the friction factor between the tool and the workpiece and extending the service life of the tool. In addition, because the thermal conductivity of the coating itself is much lower than that of the tool substrate and processing materials, it can effectively reduce the heat generated by friction, form a thermal barrier, and change the path of heat loss, thereby reducing the thermal and mechanical impact between the tool and workpiece, and between the tool and cutting, effectively improving the performance of the tool.

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