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| Abstract No.: |
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Scheduled at:
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Wednesday, June 04, 2008, Auditorium 2 5:00 PM
Cold Spraying 4
Everything around this young thermal spraying technique, possible applications and latest developments for equipment of high pressure and low pressure cold spraying, models and simulations for a deeper process knowledge
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| Title: |
Influence of laser irradiation on formation of low-pressure cold sprayed coatings
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| Authors: |
Minna Kulmala* / Tampere University of Technology, Institute of Materials Science, Finland
Heli Koivuluoto / Tampere University of Technology, Institute of Materials Science, Finland
Petri Vuoristo/ Tampere University of Technology, Institute of Materials Science, Finland
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| Abstract: |
In cold sprayed coatings, the technical properties are besides the coating material itself also highly determined by the integrity of interparticle boundaries and coating to substrate interface. One possibility to affect these boundaries is a simultaneous laser irradiation during the cold spray process. It is expected that laser-assisted low-pressure cold spraying could be an effective method to improve the low-pressure cold sprayed coating denseness and adhesion. The purpose of the additional energy from the laser beam is to create denser and more adherent coatings, enhance deposition efficiency and increase the variety of coating materials. In this study copper and nickel powders with additions of alumina powder were laser-assisted low-pressure cold sprayed (LALPCS) on carbon steel. Coatings were sprayed using nitrogen or air as process gas. A 6 kW diode laser or 4 kW Nd:YAG laser and low-pressure cold spraying unit were used in the experiments. The influence of laser energy on coating microstructure, denseness and deposition efficiency was studied. The coating microstructure was characterized by SEM. The coating denseness was tested with open cell potential measurements and salt spray tests. Results showed that laser assistance made coatings denser and also enhanced deposition efficiency.
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