An armature coating with ablation resistance and conductive lubrication properties and its preparation method.

By preparing a refractory metal coating on the armature surface and filling it with a low-melting-point alloy, the problem of excessive melting of the armature under high current conditions was solved, and a composite coating with anti-ablation and conductive lubrication was achieved, thus improving the performance of the electromagnetic launch device.

CN122081920APending Publication Date: 2026-05-26CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
Filing Date
2026-01-06
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

In existing electromagnetic rail launchers, the armature is prone to over-melting under high current conditions, leading to problems such as aluminum molten metal spraying, armature/rail contact instability, and aluminum accumulation on the guide rail. Furthermore, existing coatings offer limited improvement in ablation resistance and do not fully utilize the lubricating effect of liquid metal.

Method used

A refractory metal coating is prepared on the surface of the armature, and pits are distributed on the surface and filled with low-melting-point alloys. A composite coating of refractory metal and low-melting-point alloy is formed by cold spraying technology. Combining the anti-melting properties of refractory metal and the conductive lubrication properties of low-melting-point metal, the ablation resistance and conductive lubrication effects are achieved.

Benefits of technology

It significantly improves the armature's resistance to ablation, optimizes the current-carrying friction characteristics of the armature/rail interface, reduces wear, and achieves continuous conductive lubrication during electromagnetic launch, thereby improving electromagnetic launch efficiency.

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Abstract

This invention discloses an armature coating with ablation resistance and conductive lubrication properties, and its preparation method. A refractory metal is deposited on the armature surface using cold spraying technology. The surface of the refractory metal coating is then processed into an array of pits of a certain depth. Next, a low-melting-point alloy powder is sprayed onto the textured pits using a cold spraying process to fill the pits. Finally, the low-melting-point alloy coating above the pit surface is removed, resulting in a morphology of a dotted textured array of low-melting-point alloy distributed on the refractory metal surface. The refractory metal coating significantly improves the armature's ablation resistance, while the low-melting-point alloy provides continuous conductive lubrication at the friction interface. This invention combines the high-melting-point ablation resistance of the refractory metal coating with the conductive lubrication properties of the low-melting-point metal, overcoming the limitation of traditional single-function protective coatings for armature surfaces. It enables the preparation of a novel protective coating for electromagnetic launch armature surfaces that possesses excellent conductivity, lubrication, and ablation resistance.
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