| Reference : Chemical Bonds in Laser Welded Aluminum and Polyamide |
| Scientific Presentations in Universities or Research Centers : Scientific presentation in universities or research centers | |||
| Engineering, computing & technology : Materials science & engineering | |||
| Physics and Materials Science | |||
| http://hdl.handle.net/10993/41039 | |||
| Chemical Bonds in Laser Welded Aluminum and Polyamide | |
| English | |
Hirchenhahn, Pierre  [Université de Namur > Centre de recherche en physique de la matière et du rayonnement] | |
| Al Sayyad, Adham [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >] | |
| Bardon, Julien [Luxembourg Institute of Science & Technology - LIST] | |
| Plapper, Peter [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >] | |
| Houssiau, Laurent [Université de Namur > Centre de recherche en physique de la matière et du rayonnement] | |
| 14-Sep-2017 | |
| International | |
| 21st International Conference on Secondary Ion Mass Spectrometry - SIMS21 | |
| 10-9-2017 to 15-9-2017 | |
| [en] laser welding ; metal–polymer ; physicochemical bond | |
| [en] Automotive industry is showing an increasing interest towards polymer/metal
assemblies, essentially in order to increase fuel efficiency through the reduction of car body weight. In parallel, these assemblies are interesting for biomedical applications, because of the potential to obtain improved or new properties e.g. for implants. Laser welding is considered one of the most promising methods of joining dissimilar materials because of its unique advantages; the process is fast, can be adapted to complex geometries and is totally solvent free, which is a major asset for biomedical applications [1]. A strong adhesion between polyamide 6.6 (PA-6.6) and aluminum (Al) plates was obtained from laser welding in optimized conditions [2]. However, the root causes of this adhesion are not yet understood. Several effects may come into play, such as covalent binding, electrostatic binding, interdiffusion and mechanical interlocking. This is further complicated in “real life” samples by the high roughness of the metal sheet, the additives contained in the polymer, the Al and PA-6.6 surface composition and the difficulty to reach the metal-polymer interface. In order to gain information on the chemical binding between the oxydized Al surface and the PA-6.6, model samples were prepared by spin coating ultrathin PA-6.6 films on polished Al (99.999 % purity) plates (Fig. 1.). The two materials were subsequently welded by laser irradiation. FT-IR, XPS and ToF-SIMS have been used to carry out this study. The interface was reached by sputtering the polymer with low energy Cs+ ions in ToF-SIMS and Ar clusters GCIB in XPS. In this preliminary study, ions binding the Al with polymer were identified in both the positive (AlCH3O+, AlNH+, AlNH2 +, Al2NH+) AlCNO+, AlONH3 +) and negative polarities, (AlN-, AlNO-, AlCO-, AlCNO-). Depth profiles and images near the interface were obtained. Results obtained on our model samples will be compared with laser joints obtained on “real” samples. Ultimately, this work aims at providing guidelines for improving the mechanical resistance of the weld. | |
| Fonds National de la Recherche - FnR and DGO6 | |
| http://hdl.handle.net/10993/41039 | |
| FnR ; FNR10861142 > Peter Plapper > LaserSTAMP > Laser and Surface Treatment Assisted Metal Polymer assembly > 01/09/2016 > 31/08/2019 > 2016 |
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