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Enhancement of low pressure cold sprayed copper coating adhesion by laser texturing on aluminum substrates

: Knapp, W.; Gillet, V.; Courant, B.; Aubignat, E.; Costil, S.; Langlade, C.


Kaierle, S. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
High-Power Laser Materials Processing: Applications, Diagnostics, and Systems VI : 31 January-2 February 2017, San Francisco, California, United States
Bellingham, WA: SPIE, 2017 (Proceedings of SPIE 10097)
ISBN: 978-1-5106-0635-7
ISBN: 978-1-5106-0636-4
Paper 100970P, 13 pp.
Conference "High-Power Laser Materials Processing - Applications, Diagnostics, and Systems" <6, 2017, San Francisco/Calif.>
Conference Paper
Fraunhofer ILT ()

Surface pre-treatment is fundamental in thermal spraying processes to obtain a sufficient bonding strength between substrate and coating. Different pre-treatments can be used, mostly grit-blasting for current industrial applications. This study is focused on Cu-Al2O3 coatings obtained by Low Pressure Cold Spray on AW5083 aluminum alloy substrate. Bonding strength is measured by tensile adhesion test, while deposition efficiency is measured. Substrates are textured by laser, using a pattern of equally spaced grooves with almost constant diameter and variations of depth. Results show that bonding strength is improved up to +81% compared to non-treated substrate, while deposition efficiency remains constant. The study of the samples after rupture reveals a modification of the failure mode, from mixed failure to cohesive failure. A modification of crack propagation is also noticed, the shape of laser textured grooves induces a deviation of cracks inside the coating instead of following the interface between the layers.