An extreme environment flux-cored wire based on high-entropy oxide and transient liquid phase coating modification and a preparation method and application thereof

By introducing high-entropy oxides and transient liquid phase coating modification into the welding material, the problems of coarsening and agglomeration of nanoparticles during the welding process are solved, realizing high-performance welds in extreme environments, which are suitable for welding nuclear reactors, deep-sea submersibles and ultra-supercritical generator sets.

CN122378313APending Publication Date: 2026-07-14GUANGXI UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGXI UNIV
Filing Date
2026-06-12
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Existing nanoparticles suffer from coarsening failure, agglomeration and floating, and the contradiction between strength and toughness during the welding process, making it difficult to achieve uniform dispersion and high-performance welds in extreme environments.

Method used

By using flux-cored wire modified with high-entropy oxide and transient liquid phase coating, a TLP@HEOs core-shell composite nanopowder is formed by coating the surface of the high-entropy oxide core with a transient liquid phase amorphous alloy shell. This achieves uniform dispersion and metallurgical bonding of nanoparticles, suppresses coarsening, and forms a heterogeneous metallographic structure in the weld.

Benefits of technology

Thermodynamic stability and interfacial wettability of nanoparticles were achieved under extreme environments. The weld exhibited high yield strength and plasticity, and the welding process was stable. It is suitable for welding nuclear reactors, deep-sea submersibles and ultra-supercritical generator sets.

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Abstract

The application discloses an extreme environment drug core welding wire based on high-entropy oxide and transient liquid phase coating modification and a preparation method and application thereof, and belongs to the technical field of welding materials. The extreme environment drug core welding wire comprises an outer skin base material and a composite drug core filled in the inner part of the outer skin base material, and the composite drug core contains uniformly dispersed TLP@HEOs core-shell composite nanopowder. The nanopowder takes high-entropy oxide as a core and is coated with a transient liquid phase amorphous alloy shell layer on the surface. The application utilizes the high-temperature anti-coarsening characteristic of high-entropy oxide, combines the transient liquid phase shell layer to improve the wettability of the ceramic phase and the liquid metal, solves the problems of agglomeration and floating of the nanoparticles in the welding pool, disperses the nano phase to induce the welding seam to form an isomeric metallographic structure with alternating thickness, and breaks through the contradiction of the inverted strength and toughness. The prepared drug core welding wire has excellent comprehensive mechanical properties and long-term stability in extreme environments such as ultrahigh temperature and extremely low temperature, and can be applied to the welding manufacturing of heat-resistant components such as nuclear reactor pressure vessels.
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