Application of cold spraying for flux-free brazing of aluminium alloy 6060 |
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Authors: | Kirsten Bobzin Lidong Zhao Thomas Schlaefer and Thomas Warda |
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Affiliation: | (1) Department of Materials Science, Tampere University of Technology, P.O. Box 589, 33101 Tampere, Finland;(2) Technology Centre KETEK Oy, Korpintie 8, 67100 Kokkola, Finland |
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Abstract: | In the present study, samples of aluminium alloy 6060 were coated by cold spraying with a powder of brazing alloy Al12Si.
The influence of the process gas temperature on particle velocities and coating build-up was investigated. The coated samples
were heat-treated in air and under argon atmosphere to investigate the wetting behaviour of the deposited Al12Si and the diffusion
processes between Al12Si coatings and substrates. Coated samples were brazed flux-free under argon atmosphere by an induction
heating system. The microstructure of the coated, heat-treated, and brazed samples was investigated. The shear strength of
the brazed joints was determined. The results show that the brazing alloy Al12Si could be very well deposited on the substrate
by cold spraying. The particle velocity increased with increasing process temperature. Correspondingly, the thickness of Al12Si
coatings increased with increasing process temperature. The heat treatments showed that a very good metallurgical bond between
the Al12Si coatings and the substrate could be realized by the deposition using cold spraying. The coated samples could be
well brazed without fluxes. The coating thickness and overlap width influenced the shear strength of the brazed joints. The
highest shear strength of brazed joints amounts to 80 MPa. |
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