Preparation method for composite multi-layer thin film coating

Abstract

The invention discloses a preparation method for a composite multi-layer thin film coating. The preparation method comprises the following preparation steps that an aluminum product is chosen as a substrate, the surface of the substrate is cleaned through ethyl alcohol and ultrasonic waves and is dried after being ground and polished through abrasive paper, a trivalent chromate solution with the mass concentration being 5% is taken, and the content of trivalent chromium of the trivalent chromate solution is 2g / L on a Cr2O3 content basis. The preparation method for the composite multi-layer thin film coating is high in hardness, toughness and bonding strength, resistant to abrasion and resistant to corrosion. Due to the fact that a direct current reaction magnetic control co-sputtering film coating system is adopted, the nitrogen partial pressure does not need to be adjusted frequently, the efficiency is improved and the precision is also improved, so that the production line operation is made to be possible. Due to the fact that a metallic nickel layer is added, the thin film hardness is up to 50 gigapascals, the bonding strength is up to 200 N, and the toughness, the abrasion resistance and the corrosion resistance are all higher than those of a TiN single-layer film.

Description

technical field [0001] The invention relates to a preparation method, in particular to a preparation method of a composite multilayer film coating. Background technique [0002] High hardness multilayer films, especially nitride multilayer film systems, their high hardness, diversity in material combinations and selectivity in their properties, demonstrate that such films are useful in both tool coatings and decorative coatings. It has broad application prospects in various surface strengthening and surface modification fields. [0003] Pure metals (such as nickel) have good plasticity, and nitrides (such as drinking nitride) ceramics have high hardness, and the combination of the two can obtain superior mechanical properties. The reasons are as follows: First, due to the difference in the crystal structure and slip system of metal and nitride, it will hinder the movement of dislocations and the expansion of cracks, which will cause an increase in hardness; second, metals w...

AI Technical Summary

Problems solved by technology

[0005] Among the ceramic / metal nano-multilayer film systems, TiN / Ti and CrN / Cr are the most researched, and the multilayer film needs to frequently adjust the nitrogen partial pressure during the deposition process, which is inconvenient to operate and low in efficiency.