Brazing filler metal and preparation method and application thereof

By designing sandwich foil-like brazing, using the combination of aluminum foil layer and Sr and foam aluminum particles, the problems of solder loss and turbulence in rare earth-modified die-cast aluminum alloy brazing are solved, and a high-reliability brazing effect is achieved.

CN119635066AActive Publication Date: 2025-03-18ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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Patent Information

Application Number
CN202411845114.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-13
Publication Date
2025-03-18
Estimated Expiration
2044-12-13

AI Technical Summary

Technical Problem

During the brazing process, conventional aluminum-silicon soldering materials are lost in large quantities, resulting in the incontinuous brazing seams and the storing fluid flow, which seriously affects the performance of the radiator.

Method used

A sandwich foil-shaped solder is designed, including a solder metal core wrapped in an aluminum foil layer. The solder metal core contains Sr and foam aluminum particles. Through the barrier effect of the aluminum foil layer and the paste effect of Sr and foam aluminum particles, the solder material loss and turbulence are inhibited.

Benefits of technology

It effectively suppresses the loss and turbulence of brazing materials, improves the shear strength of the brazing joints, and significantly improves the brazing quality of rare earth modified die-cast aluminum alloy.

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Abstract

The invention relates to the technical field of brazing materials, in particular to brazing filler metal and a preparation method and application thereof. The solid state of the brazing filler metal is in a sandwich foil shape, the brazing filler metal comprises a foil-shaped brazing filler metal core and an aluminum foil layer wrapping the peripheral side of the brazing filler metal core, and the brazing filler metal core contains Sr and foamed aluminum particles. The preparation method comprises the following steps: S1, melting a required amount of aluminum foil layer raw material into molten metal, and casting to obtain a hollow plate-shaped aluminum frame body with openings at two ends; s2, a required amount of brazing filler metal metal core raw material is heated to prepare a metal suspension containing solid foamed aluminum particles, the metal suspension is injected into the aluminum frame body, and a composite metal plate is obtained after cooling; and S3, the composite metal plate is subjected to multi-pass rough rolling and finish rolling, and the sandwich foil-shaped brazing filler metal is obtained. The brazing filler metal structure and the formula components are optimized and improved, brazing filler metal loss and brazing filler metal liquid turbulence during brazing can be restrained, and the shear strength of a brazed joint is improved.
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