Cutting tool material performance requirements are very high, the cutting edge to withstand high temperatures (300 ~ 1200 ℃), high pressure (100 ~ 10000n / mm2), high-speed (1 ~ 30m / s) and high strain rate (103 ~ 107 / s ), thus requiring the tool both have high hardness and wear resistance, but also have high strength and toughness, and the coated tool is one of the best solution to this contradiction. The tool is coated with the coating on a substrate material with high strength and toughness layer high temperature, wear-resistant materials. Requires a strong bond between the coating material and the substrate material, not falling. Coating technology for its significant effect, adaptability, fast response and so on, will be in the future to improve the performance and cutting tool technology advances to play a very important role in promoting.

At present, the commonly used tool coating methods include chemical vapor deposition (cvd), physical vapor deposition (pvd), plasma chemical vapor deposition (pcvd), salt bath dipping process, spraying, coating and chemical pyrolytic deposition coating France, of which the most widely used cvd and pvd. Chemical vapor deposition method at 1000 ℃ high temperature vacuum furnace, by coating or vacuum arc evaporation coating material is deposited in the tool substrate surface, deposition of a 15μm thick coating of about 4h. In the current cutting tool, a chemical vapor deposition coating and dried cobalt enhanced blade 40 to 50%.