Brazing aluminum steel and cesium and rubidium containing brazing flux thereof

Abstract

The invention relates to brazing aluminum steel and a cesium and rubidium containing brazing flux thereof and belongs to the field of brazing materials in non-metal materials. The brazing flux comprises, by a mole ratio, 0.01 mol to 0.56 mol of rubidium fluoride (RbF), 0.15 mol to 0.58 mol of cesium fluoride (CsF), 0.001 mol to 0.25 mol of aluminum oxide (Al2O3), 0.001 mol to 0.2 mol of potassium fluoride (KF), 0.002 mol to 0.05 mol of gallium fluoride (GaF3), 0.001 mol to 0.025 mol of lithium fluoride (LiF), 0.001 mol to 0.025 mol of boron fluoride (BF3), and the balance aluminum fluoride (AlF3). According to the brazing aluminum steel and a cesium and rubidium containing brazing flux thereof, brazing technical requirements of aluminum to aluminum, aluminum to copper, and aluminum to steel can be simultaneously met, and the high-activity novel soldering flux is achieved.

Description

[0001] technical field [0002] The invention belongs to the field of brazing materials of non-metallic materials, and in particular relates to a flux containing cesium and rubidium elements which can be used for brazing aluminum steel and aluminum copper. [0003] Background technique [0004] With the rapid development of aerospace, rail transit, energy industry and refrigeration technology, there are more and more applications for composite structures of aluminum alloy and copper, aluminum alloy and steel. The structure of aluminum-copper and aluminum-steel bimetallic composite materials It has been widely used in power stations, light industry, home appliances and other fields. However, so far, the mature method of preparing aluminum-copper and aluminum-steel bimetallic composite materials is still the "hot rolling composite method". The "connection" of metal composite materials has always been a difficult problem. [0005] The applicant has searched the literature, a...

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Problems solved by technology

[0008] The oxide on the surface of aluminum alloy is mainly Al 2 o 3 , MgO, MnO, CuO, SiO 2 etc., the oxides on the steel surface are mainly FeO, Fe 2 o 3 , NiO, Cr 2 o 3 etc., the oxides on the surface of copper alloy are mainly CuO, Cu 2 O, ZnO, etc., existing studies have shown that it is extremely difficult to remove oxides on aluminum alloys, copper alloys, and steel surfaces at the same time using a flux

CsAlF4 and KCsAlF4, which appeared in recent years, can remove the oxides on the surface of aluminum alloy and copper alloy well at the same time, so as to solve the problem of brazing of aluminum-copper dissimilar materials. However, it still cannot remove the oxides on the surface of aluminum alloy and steel (or stainless steel) at the same time; CN201310445105.3 recommends "a new type of flux for brazing stainless steel and aluminum" that can solve the brazing of aluminum-steel dissimilar materials , but cannot braze aluminum-copper dissimilar materials