Aluminum composite material for use in thermal flux-free joining methods and method for producing same

Abstract

The invention relates to an aluminum composite material for use in thermal flux-free joining methods, comprising at least one core layer, which consists of an aluminum core alloy, and at least one outer solder layer, which is provided on one side or both sides of the core layer and which consists of an aluminum solder alloy. The aim of proposing an aluminum composite material for use in a thermalflux-free joining method by means of which the soldering properties can be further optimized both in a vacuum and under shielding gas without the use of fluxes while avoiding the disadvantages known from the prior art is achieved in that the aluminum solder alloy has the following composition in wt%: 6.5%<=Si<=13%, Fe<=1%, 90 ppm<=Mg<=300 ppm, Bi<500 ppm, Mn<=0.15%, Cu<=0.3%, Zn<=3%, Ti<=0.3%, theremainder Al and unavoidable impurities of at most 0.05% individually and at most 0.15% in total, and the aluminum solder layer has a surface that has been pickled in an alkaline or acidic manner. The invention further relates to a method for producing an aluminum composite material, in particular an aluminum composite material according to the invention, wherein at least one core layer consisting of an aluminum core alloy is provided and at least one outer solder layer consisting of an aluminum solder alloy is applied to one side or both sides of the core layer. The invention further relatesto a method for thermally joining components and to a thermally joined construction.

Description

technical field [0001] The invention relates to an aluminum composite material for use in a flux-free thermal joining process, comprising at least one core layer consisting of an aluminum core alloy and at least one aluminum solder alloy disposed on one or both sides of the core layer constitute the outer solder layer. Furthermore, the invention relates to a method for producing an aluminum composite material, in particular an aluminum composite material according to the invention, in which method at least one core layer consisting of an aluminum core alloy is produced and on one side of the core layer Or at least one outer solder layer consisting of an aluminum solder alloy is applied on both sides. Furthermore, the invention relates to a method for thermally bonding components and a thermally bonded structure. Background technique [0002] Aluminum composite materials having at least one core layer consisting of an aluminum core alloy and at least one outer solder layer ...

AI Technical Summary

Problems solved by technology

However, the two-layer construction of the aluminum solder layer has the disadvantage that higher costs occur in the production of the two-layer aluminum solder layer

Furthermore, an important disadvantage of the usual two-layer construction, for example with the outer cladding of pure aluminum, is that it is not compatible with fluxes

Insufficient brazing results, e.g. due to a temporarily worse furnace atmosphere with too high oxygen partial pressure or too high humidity, cannot be compensated by adding flux

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