A method for preparing a thermal shock and oxidation resistant coating on a tantalum-niobium alloy surface

By forming a high-entropy disilicide coating, a SiAlCN transition layer, and a Cr2AlC outermost layer on the surface of tantalum-niobium alloy, the oxidation and thermal stress problems of tantalum-niobium alloy at high temperatures are solved, and the oxidation resistance, thermal shock resistance, and adhesion of the coating are improved.

CN122169018APending Publication Date: 2026-06-09BAOJI HENGYE NONFERROUS METAL TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BAOJI HENGYE NONFERROUS METAL TECH CO LTD
Filing Date
2026-05-11
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing coatings on tantalum-niobium alloy surfaces are prone to oxidation at high temperatures, and thermal stress caused by mismatched coefficients of thermal expansion can lead to coating cracking or peeling. It is difficult to simultaneously achieve oxidation resistance, thermal shock resistance, and adhesion.

Method used

A high-entropy disilicide coating is formed by the co-infiltration reaction of silicon powder, molybdenum powder, tungsten powder, titanium powder, NH4Cl and α-Al2O3. Combined with a SiAlCN transition layer and a Cr2AlC outermost layer, the interfacial bonding and thermal shock resistance are enhanced by a multi-element solid solution and a nano-array structure.

Benefits of technology

It improves the coating's oxidation resistance, thermal shock resistance, and adhesion, inhibits powdering and peeling of the coating at high temperatures, and enhances the overall stability and thermal shock resistance of the coating.

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Abstract

The application relates to a preparation method of a thermal shock and oxidation resistant coating on a tantalum-niobium alloy surface, and belongs to the technical field of thermal shock and oxidation resistant coating preparation in chemical engineering. The method comprises the process steps of preparing a high-entropy disilicide layer and preparing a transition layer. The tantalum-niobium alloy is preheated, Ar and H2 are introduced, then Cr2AlC powder is used for plasma spraying, and finally tempering and solidification are carried out, so that the thermal shock and oxidation resistant coating is obtained. The thermal shock and oxidation resistant coating can improve the oxidation resistance, thermal shock resistance and adhesion of the coating. The process step design is scientific and reasonable, the coating preparation process is simple, the product quality is excellent, and the application environment is friendly.
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