Thermally sprayed solder/braze filler alloys for the joining of light metals
Generally the established thermal spray technologies like flame or arc spraying can be used for the defined deposition of solder/braze filler metal layers. But for those processes used under atmospheric conditions the achieved quality of the solder/braze joints is low. A high density of defects like inclusions or oxides, pores and contaminations are not avoidable. The novel technique of the cold gas spraying (CGS) works with very low process temperatures. Therefore the heating of spray particles is reduced to a minimum. The produced coatings are free of oxides and show very low porosity. So investigations concerning the potential of CGS for the application of solder/braze filler metals are self-evident. In this work, substrates of different aluminium alloys (AA1050, AA3005, AA5754 and AA7022) are chosen. Depending on their particular solidification temperature, the used solder/braze filler materials are Al-, Zn- and Sn-based alloys.
B. Wielage, A. Wank, Th. Grund
Institute of Composite Materials, Faculty of Mechanical Engineering, TU Chemnitz