Method for manufacturing linear change gradient coating of TiAlCN non-metallic element

Abstract

The invention discloses a method for preparing a TiAlCN non metallic element linear variation gradient coating. The coating treatment which adopts the PVD method is divided into four continuous time sections; in the second time section, a furnace chamber is simultaneously filled with argon gas(Ar), nitrogen gas(N2) and acetylene gas(C2H2), wherein the flow rate of the argon gas(Ar) is kept constant, the flow rate of the nitrogen gas(N2) decreases or increases at an uniform speed and the flow rate of the acetylene gas(C2H2) increases or decreases at an uniform speed so that the TiAlCN gradient coating with non metallic element linear variation is formed; the coating prepared by the method has the advantages of high surface finish, strong anti-stripping capability and good anti-knife bonding performance, is more suitable for finishing machining, and particularly shows excellent performances in processing materials with strong viscidity at the medium and low speed under the condition of water solution cooling.

Description

technical field [0001] The invention relates to a coating of a cutting tool, in particular to a preparation method of a TiAlCN non-metallic element linearly changing gradient coating. Background technique [0002] Coating treatment of cutting tools is one of the important ways to improve the performance of cutting tools. Coated cutting tools have the characteristics of high surface hardness, good wear resistance, stable chemical properties, heat resistance and oxidation resistance, small friction factor and low thermal conductivity. Compared with uncoated cutting tools, it can increase the service life by more than 3~5 times, increase the cutting speed by 20%~70%, improve the machining accuracy by 0.5~1 grade, and reduce the consumption cost of cutting tools by 20%~50%. The surface coating technology of cutting tools is a high-quality surface modification technology developed as a market demand. Because this technology can obtain excellent comprehensive mechanical properties...

AI Technical Summary

Problems solved by technology

Although the coating prepared by PVD technology has the advantages of high hardness, low friction coefficient, good wear resistance and chemical stability, there are still some disadvantages. For example, TiN / TiC coating has microscopic Low hardness, brittle performance, not impact resistance and other shortcomings; another example, multi-layer coatings still have the problem of large internal stress, which makes the performance of the film layer not stable enough during cutting; another example, TiCN, TiC / TiN coatings in cutting When the temperature is high, there is the disadvantage that the film layer is easily oxidized and ablated; for example, most of the existing coatings have the problem of easy sticking to the knife when processing viscous materials, etc.