Titanium alloy-based composite coating structure, method for inhibiting titanium upward dilution during cladding of wear-resistant layer on titanium alloy surface and application

By forming an aluminum bronze barrier layer on a titanium alloy substrate, the problems of Ti element dilution and brittle phase formation during laser cladding of titanium alloy surface coatings are solved, achieving a high-performance wear-resistant and corrosion-resistant coating suitable for marine equipment.

CN121826708BActive Publication Date: 2026-06-16NINGBO INST OF MATERIALS TECH & ENG CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACAD OF SCI
Filing Date
2026-03-12
Publication Date
2026-06-16

AI Technical Summary

⚠Technical Problem

During laser cladding, titanium alloy surface coatings are prone to Ti element dilution and brittle phase formation, which can lead to coating cracking and affect their application in marine environments.

⚗Method used

An aluminum bronze barrier layer is formed on a titanium alloy substrate, and a transition alloy wear-resistant layer is formed on it using laser cladding technology. The chemical affinity and compatibility of the aluminum bronze barrier layer are used to prevent the dilution of Ti element and promote the formation of Cu2TiAl phase, thereby mitigating the difference in thermophysical properties.

🎯Benefits of technology

It significantly reduces the formation of brittle phases in the wear-resistant layer, improves the bonding strength and toughness of the coating, reduces the risk of cracking, and enhances wear and corrosion resistance, making it suitable for marine environments.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application provides a titanium alloy-based composite coating structure, a method for inhibiting Ti upward dilution when a titanium alloy surface is cladded with a wear-resistant layer and application. The method comprises forming an aluminum bronze barrier layer on a titanium alloy substrate, the phase structure of the aluminum bronze barrier layer comprising a Cu phase and a Cu2TiAl phase, the Cu phase and the Cu2TiAl phase both being FCC crystal structures, the Cu2TiAl phase being formed by the reaction of Ti elements in the titanium alloy substrate with Cu and Al; the volume ratio of the Cu phase and the Cu2TiAl phase in the aluminum bronze barrier layer being 40% to 45% and 55% to 60% respectively; and a transition group alloy wear-resistant layer is formed on the titanium alloy substrate with the aluminum bronze barrier layer by using a laser cladding technology. The aluminum bronze barrier layer is arranged to reduce Ti upward dilution of the transition group alloy wear-resistant layer in the cladding process, avoid the generation of a large number of hard and brittle phases, relieve the difference in thermal physical properties between the wear-resistant layer and the titanium alloy substrate, and reduce coating cracking.
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