Long-service-life ultra-nano diamond periodic multi-layer coating cutter

The utility model discloses a long-service-life ultra-nano diamond periodic multi-layer coated cutting tool, belongs to the technical field of manufacturing of coated cutting tools, and particularly relates to structural design of the long-service-life ultra-nano diamond periodic multi-layer coated cutting tool. The coating of the multilayer coated cutting tool mainly comprises a cutting tool basebody, a transition layer and a periodic high-nitrogen-doped and low-nitrogen-doped ultra-nano diamond multilayer film. The base body is mainly made of hard alloy, the thickness of the transition layer ranges from 100 nm to 800 nm, and the single-layer thickness of the multi-layer film is smaller than 10 nm. The bottom of the transition layer is attached to the surface of the base body. Wherein the bottom of the high-nitrogen-doped ultra-nano diamond layer is attached to the top of the transition layer, the bottom of the low-nitrogen-doped ultra-nano diamond layer is attached to the top of thehigh-nitrogen-doped layer