Preparation method of decorating protective coating for CrNx-based component gradient transition

Abstract

The invention discloses a preparation method of a decorating protective coating for CrNx-based component gradient transition. The method comprises the following steps: adopting three pairs of plane Cr targets as sources of a corresponding Cr element; uniformly installing the three pairs of plane Cr targets on the inner wall of ion source-enhanced magnetron sputtering ion plating equipment; controlling the sputtering rate of three pairs of plane Cr targets by adjusting the current of a medium-frequency pulse power supply; adopting an anode layer gas ion source to improve the ionization rate of the gas and the energy of reaction particles; adopting high-purity Ar as a target sputtering gas; adopting high-purity N2 as a reaction gas; ionizing and combining with Cr particles sputtered from the target after passing through an anode layer gas ion source; depositing and forming a Cr base layer / a CrNx-based gradient transition layer / a CrN outer layer in a triple-layer structure on the surface of the sample. The coating is smooth and compact in surface, the microhardness is Hv800, the film-substrate adhesion achieves 80N, the dry friction coefficient of the CrNx-based coating is 0.35 when the friction pair is Al2O3 balls, and the corrosion resistance of a neutral salt spray test exceeds 672 hours.

Description

technical field [0001] The invention belongs to the field of preparation of coating materials, and in particular relates to a preparation method of a decorative protective coating with gradient transition of CrNx-based components. Background technique [0002] Hard coatings such as TiN, TiC, CrN, TiCN, TiSiN, etc. generally have excellent properties such as high hardness, wear resistance and corrosion resistance, and are used for surface decoration of daily electronic products, sanitary products, mechanical products, automotive and aviation parts, etc. The field of protection is being widely used, such as mobile phones, watches, laptop computers, faucets, bathtub spouts, standard fasteners for automobiles and aircraft, etc. [0003] In recent years, in order to improve the competitiveness of products, the comprehensive performance requirements for surface decoration and protective coatings are getting higher and higher. However, the existing coating preparation technology is...

AI Technical Summary

Problems solved by technology

By increasing the thickness of the coating, its hardness and wear resistance can be improved, but the residual stress in the coating will also increase, resulting in a decrease in the bonding force and corrosion resistance of the coating, while the appearance of the coating is smooth, the uniformity and stability of the color also decreased to varying degrees

At present, regardless of the single-structure CrN coating, the two-layer Cr bottom layer / CrN coating, or the three-layer Cr bottom layer / CrN transition layer / CrN outer layer, or the Cr bottom layer / TiN or TiC transition layer / CrN outer layer And other designs, because the product substrate is generally soft, the composition and performance of the high-hardness CrN coating prepared according to the above-mentioned coating structure design is still insufficient or discontinuous with the substrate material, and the uneven composition is easy to cause the appearance of the coating The smoothness or color is poor, and the uneven performance will easily cause the coating to fall off early in the process of use, or it is not resistant to abrasion, or it is not resistant to corrosion

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