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7318 |
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Friday, May 06, 2022, Hall G2 9:00 AM New Processes II |
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Liquid accelerated cold spray for copper deposition |
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Ali Akbarnozari* / Concordia University, Canada Christian Moreau / Concordia University, Canada Saeed Garmeh/ Concordia University, Canada Fadhel Ben Ettouil/ Concordia University, Canada Sylvain Desaulniers/ Polycontrols, Canada Luc Pouliot/ Polycontrols, Canada Ali Dolatabadi/ University of Toronto, Canada Christian Moreau/ Concordia University, Canada |
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Cold spray has become a robust coating process which uses a high velocity propelling gas such as nitrogen or helium to accelerate particles in order to deposit metallic layers on a substrate. However, there are some drawbacks in using gaseous propellant, for instance, gas consumption and cost. Also, it imposes some limits in terms of the maximum particle size that can be efficiently accelerated. To address those limitations, a liquid propellant can be used instead. Thanks to its higher density, the liquid propellant can efficiently accelerate much larger particles, potentially around 150 microns. Significant cost savings are foreseeable, depending on the nature of the fluid used (water for example) and less stringent requirements on the particle size. In this paper, the liquid accelerated cold spray (LACS) system is described. The fluid used in the current system was water, and the system was employed to deposit copper particles on a steel substrate. The influence of water temperature and pressure on the jet characteristics at the nozzle exit was studied. Additionally, the effect of spraying parameters such as propellant pressure, spraying distance, substrate roughness, substrate temperature, and powder size on the coating microstructure and deposition efficiency was investigated. |