A high-entropy alloy brazing paste, a preparation method thereof and a brazing process

CN121848018BActive Publication Date: 2026-06-09CHINA INNOVATION ACADEMY OF INTELLIGENT EQUIP CO LTD +1

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: CHINA INNOVATION ACADEMY OF INTELLIGENT EQUIP CO LTD
Filing Date: 2026-03-18
Publication Date: 2026-06-09

AI Technical Summary

Technical Problem

High-entropy alloy brazing processes suffer from problems such as poor wettability, insufficient diffusion, difficulty in controlling the interfacial reaction time window, and low coating reliability. In particular, uneven wetting and the formation of brittle interfacial phases are caused by the agglomeration and segregation of inorganic boron powder.

Method used

A soluble organic boron precursor, such as carborane, is uniformly dispersed in the brazing paste and released active boron atoms through in-situ pyrolysis during the brazing process. Combined with ultrasonic vibration to promote interfacial reaction, low-temperature wetting and nanoscale grain boundary strengthening are achieved.

Benefits of technology

It improves the interfacial density and bonding reliability of the brazing coating, reduces the heat-affected zone, and improves the impact toughness and interfacial bonding strength of the coating.

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Abstract

This invention relates to the field of surface strengthening technology, specifically to a high-entropy alloy brazing paste, its preparation method, and brazing process. By mass, the brazing paste comprises the following components: 60-85 parts high-entropy alloy powder, 5-25 parts reinforcing hard phase powder, 0.5-8 parts organoboron precursor, 1-5 parts binder, and 2-15 parts organic solvent; wherein the organoboron precursor includes at least one of carborane, carborane derivatives, and polymers containing carborane structures; carborane includes at least one of ortho-carborane, meta-carborane, and para-carborane. This invention uses a soluble organoboron precursor to replace traditional inorganic boron powder, achieving a molecular-level uniform distribution of boron in the paste stage. Furthermore, ultrasonic vibration is introduced during the brazing process to assist in the release of active boron atoms from the in-situ cracking of the organoboron precursor, which participates in the alloy reaction, effectively improving the wettability of the brazing paste and the reliability of the coating connection.

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