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.

A coating is a solid continuous film obtained by a single application of paint. It is a thin plastic layer applied to metal, fabric, plastic, and other substrates for protection, insulation, decoration, and other purposes. Coatings can be gaseous, liquid, or solid, and the type and state of the coating is usually determined by the substrate to be sprayed.