High-performance composite film and preparation method thereof

By constructing a composite film with a gradient structure on the surface of the metal substrate, using a high-entropy alloy layer, a boride or nitride layer and a carbide layer, and doping silicon, nitrogen and fluorine elements on the surface of the carbide layer, the problem that the prior art is difficult to meet the various performance requirements of metal components under extreme conditions at the same time, and the preparation of a high-performance composite film is realized.

CN119710593APending Publication Date: 2025-03-28YANGTZE RIVER DELTA PHYSICS RES CENT CO LTD +1
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Patent Information

Application Number
CN202411920812.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-25
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing coating technology is difficult to meet the comprehensive performance of high temperature resistance, corrosion resistance, high strength and low friction coefficient required by metal components under extreme conditions.

Method used

A high-entropy alloy layer is used as the transition layer, a boron or nitride layer and a carbide layer are used as the intermediate layer, and a functional optimization layer is formed on the surface of the carbide layer to form a functional optimization layer to build a composite film with a gradient structure.

Benefits of technology

The high performance performance of composite films under extreme conditions is achieved, including high hardness, wear resistance, corrosion resistance and low friction coefficient, extending the service life of metal devices and improving performance stability.

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Abstract

The invention relates to the technical field of metal surface protection, in particular to a high-performance composite film and a preparation method thereof.The composite film comprises a transition layer, a middle layer and a function optimization layer which are sequentially arranged on the surface of a metal substrate from inside to outside, the transition layer is a high-entropy alloy layer, the middle layer contains a boride layer or a nitride layer and a carbide layer, and the function optimization layer is a high-entropy alloy layer. The function optimization layer is a film layer formed by doping at least one of silicon, nitrogen and fluorine on the surface of the carbide layer; the preparation method comprises the following steps: pretreating until the surface roughness Ra of the metal substrate is 0.05-0.2 mu m; ion beam bombardment strengthening is conducted, and then a high-entropy alloy layer is formed through a magnetron sputtering method; the middle layer is formed through combination of a magnetron sputtering method and a laser interference technology, and then the function optimization layer is formed through PECVD (Plasma Enhanced Chemical Vapor Deposition). The obtained composite film is resistant to high temperature and corrosion, high in strength and low in friction coefficient, and can be used in extreme working conditions; the preparation method provided by the invention has good operability and repeatability.
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