Brazing filler metal alloy, brazing filler metal, preparation method and application of brazing filler metal alloy, preparation method and application of brazing filler metal and prepared brazing product

Abstract

The invention provides a brazing filler metal alloy, brazing filler metal, a preparation method and application of the brazing filler metal alloy, a preparation method and application of the brazing filler metal and a prepared brazing product, and relates to the technical field of welding materials. On the basis of traditional Zn-Al based brazing filler metal, the brazing filler metal alloy is prepared by adding Mg, Ni, Cr, Ga and rare earth elements according to the specific component proportion. In the brazing filler metal alloy, the strength of the brazing filler metal can be improved through Ni; the electrode potential of the brazing filler metal can be improved through Mg; by means of Cr, a compact oxidization film can be formed, and the corrosion rate can be reduced; by means of Ga,the adhesion of corrosion products can be improved, so that the surface of the brazing filler metal is evenly covered with the corrosion products, and the exposed area of the brazing filler metal is reduced; and by means of the rare earth elements, grains can be refined, the interface can be purified, and the intergranular corrosion tendency can be reduced. Through the reasonable proportion between the components, the synergistic interaction function can be achieved, the brazing strength of the brazing filler metal is improved, it is guaranteed that the brazing filler metal has good corrosionresistance, and the existing process need of aluminum-copper material brazing connection can be met fully.

Description

technical field [0001] The invention relates to the technical field of welding materials, in particular to a brazing alloy, a brazing filler metal, a preparation method and application thereof, and a prepared brazing product. Background technique [0002] In refrigeration, electric power, electronics and other industries, aluminum is often used instead of copper for the purpose of lightening the structure and saving costs. However, in view of the difference in certain properties between aluminum and copper, some important structural parts must be made of copper, so there are corresponding technical problems of aluminum-copper connection in the preparation process of some parts. [0003] At present, the aluminum-copper connection methods mainly include fusion welding, pressure welding and brazing. Among them, the fusion welding joint has low strength and is not suitable for aluminum-copper connection; the pressure welding joint has the best quality, but the equipment is expe...

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Problems solved by technology

[0005] However, the current commercially available Zn-Al-based solder generally has the problem of low brazing strength, the shear strength is only 30-40MPa, and the corrosion resistance is poor. The phenomenon of "aging" and "brittleness" is prone to occur during storage, which seriously affects the brazing strength. The brazing process of the material and the mechanical properties of the joint, the reliability of the joint cannot be guaranteed

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