A high-thickness, high-purity max phase coating and a method of making the same

A high-thickness, high-purity MAX phase coating was prepared by plasma spraying-molten salt electrochemical conversion process, which solved the problem of poor protective effect of coatings in high temperature, heavy load and high wear environment in the existing technology, and realized efficient and low-cost coating preparation.

CN121204596BActive Publication Date: 2026-07-03NORTHWEST INSTITUTE FOR NONFERROUS METAL RESEARCH
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Patent Information

Application Number
CN202511369129.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-09-24
Publication Date
2026-07-03
Estimated Expiration
2045-09-24

AI Technical Summary

Technical Problem

Existing MAX phase coating preparation technologies cannot simultaneously achieve high thickness and high purity. Traditional methods suffer from problems such as oxidation, phase transformation, and decarburization, resulting in poor protective effects of the coating under high temperature, heavy load, and high wear environments.

Method used

A synergistic process of plasma spraying and molten salt electrochemical conversion is adopted. A spherical precursor powder coating is formed by plasma spraying, and then molten salt electrochemical conversion is carried out in an inert atmosphere to form a high-thickness, high-purity MAX phase coating through in-situ electrodeoxidation.

Benefits of technology

This method enables the efficient and low-cost preparation of high-thickness, high-purity MAX phase coatings, solving the protection requirements of coatings under high-temperature, heavy-load, and high-wear environments, improving deposition efficiency, and reducing raw material costs.

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Abstract

This invention discloses a high-thickness, high-purity MAX phase coating and its preparation method. The method includes: 1. Mixing a metal oxide and a carbon source, followed by high-energy ball milling and spray granulation to prepare spherical precursor powder; 2. Depositing a transition layer on a sandblasted substrate surface using plasma spraying, and then depositing the spherical precursor powder on the transition layer to form a precursor coating; 3. Immersing the substrate with the precursor coating in molten salt for electrolysis, causing the precursor coating to be electro-deoxidized and converted into a MAX phase coating. This invention employs a synergistic process of "plasma spraying-molten salt electrochemical conversion," converting the sprayed precursor coating into a MAX phase coating through in-situ electro-deoxidation in molten salt electrochemistry. This process has high deposition efficiency and avoids the defects of carbon loss, phase decomposition, and oxidation in the coating product when directly thermally spraying MAX materials. It achieves the preparation of a high-thickness, high-purity MAX phase coating, suitable for the field of surface protection.
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