A brazing method for improving interfacial reaction of a composite filler metal by self-adapting high-entropy ceramics

By introducing high-entropy ceramic particles into the brazing filler metal and optimizing the distribution of active elements, the problem of unstable interfacial reaction during high-entropy ceramic brazing was solved, thereby improving the strength and stability of high-entropy ceramic brazed joints. This method is applicable to various high-entropy ceramic systems.

CN118005417BActive Publication Date: 2026-01-27TIANJIN UNIV
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Patent Information

Application Number
CN202410138258.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-02-01
Publication Date
2026-01-27
Estimated Expiration
2044-02-01

AI Technical Summary

Technical Problem

In the process of high-entropy ceramic brazing, the liquid brazing alloy reacts violently with the active elements of the high-entropy ceramic matrix, resulting in unstable interfacial structure. Traditional brazing alloy optimization methods are difficult to apply to various high-entropy ceramic systems, and the interfacial reaction products are complex, resulting in insufficient joint strength.

Method used

The method of adaptive high-entropy ceramics using composite brazing filler metal involves introducing high-entropy ceramic particles that are homogeneous with high-entropy ceramics into the brazing filler metal, optimizing the content and distribution of active elements, controlling the interfacial reaction, forming a uniform interfacial reaction product, and avoiding violent dissolution.

Benefits of technology

It improves the strength of high-entropy ceramic brazed joints, enhances the stability of interfacial structure, is applicable to various high-entropy ceramic systems, increases joint strength by more than 24%, and simplifies the brazing process.

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Abstract

The application discloses a brazing method for improving interface reaction of composite filler metal self-adapting high-entropy ceramics, which comprises the following steps: firstly, uniformly mixing filler metal powder and high-entropy ceramic powder, adding anhydrous ethanol and grinding balls, ball milling to a slurry state, and obtaining a composite slurry; drying the composite slurry to obtain a composite filler metal, wherein the high-entropy ceramic particles in the composite filler metal account for 2-6 wt% of the total mass of the composite filler metal; then, mixing the composite filler metal with an adhesive and coating the mixture on a to-be-welded surface of a high-entropy ceramic block, and forming a to-be-brazed structure after adhesion; finally, heating the to-be-brazed structure to a brazing temperature according to a process curve, melting the composite filler metal to form a liquid phase, preferentially causing in-situ reaction of the first active element in the composite filler metal and the high-entropy ceramic particles, consuming part of the first active element, and enriching the remaining first active element and / or the second active element in the liquid filler metal on the surface of the high-entropy ceramic block and inducing interface reaction, and obtaining a high-entropy ceramic brazed joint after holding at the brazing temperature for a period of time and cooling. The method avoids the problem that high activity of the first active element in the commercial filler metal causes severe dissolution of the high-entropy ceramic matrix, and the joint strength is increased by more than 24%.
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