The new technology of ion source enhanced multi arc ion plating was used to prepare the gradient coating of alcrtisin with different gradient structure of Si layer on the surface of cemented carbide tools. The microstructure, residual stress, bonding strength, friction and wear of the coating, as well as the properties of milling and drilling gray cast iron were studied in detail. The results show that the alcrtisin coating with different Si layer gradient structure is mainly composed of (al, Cr) n, (al, Ti) n phase and amorphous Si3N4 phase. Among them, the G3 (gradient 3) coating with the most gentle gradient change of Si layer has higher bonding strength, lower residual compressive stress, friction coefficient and wear rate. Milling and drilling experiments show that the main wear mechanisms of coated tools are abrasive wear and adhesive wear. G3 coating reduces abrasive wear and has the highest milling and drilling life, which is mainly due to its gradient design with Si layer, appropriate compressive stress (- 3.8 GPA) and good film-based bonding strength. The results show that the cutting performance of the coated tool can be significantly improved by gradient design of Si layer.

In order to explore the wear law, cutting force and surface roughness of GH4169 processed by cemented carbide tools with different cutting distances, cutting tests were carried out on GH4169 materials. The evolution of carbide tool wear and its effect on cutting force and surface roughness are analyzed. The results show that with the increase of cutting distance, the wear area of the front cutter surface gradually expands, the wear forms of the front cutter surface are coating off, groove wear and adhesion wear, while the wear forms of the back cutter surface are coating off and micro-chip edge. The main reason for the wear of the front tool surface is that there are many hard particles and their strong viscosity in the superalloy materials. The overall variation trend of Fx, Fy and Fz is that the surface roughness first increases and then decreases with the increase of cutting distance, and the surface roughness of the specimen first decreases and then increases with the increase of cutting distance. When the cutting distance is 75m, the surface roughness is the smallest.

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