□□□ ―129―Chrystelle Bernard (Creative Interdisciplinary Research Division/Device and Technology) Over the last decade, polymer coating by cold spray attracted a kit of interest form academia and industries alike. If the process remains mainly empirical, large progresses have been made to improve the coating formation and understand the thermomechanical state of the particle form the powder to the impact. Thus, recently, Bernard et al. [1] have demonstrated the existence of a thermal gradient within the particle (around 60°C for a 60 μm UHMWPE particles). This non-negligible temperature difference will certainly induce a gradient of mechanical properties within the particle before its impact on the substrate. In addition to understanding the particle deposition mechanism, increasing the deposition efficiency (DE) of polymer particle is primordial for future applications. While the DE of polymer is usually very low (few percent), a laser-texturing of a substrate surface allowed increasing it up to 60% [2] due to a good compatibility of the substrate grooves and the particle size. However, this technique remains expensive and other ways of improvements are still researching. Especially, laser-texturing is hardly accessible for pipes’ inner wall coating where a polymer coating could protect walls against corrosion and extend the pipe’s lifespan. Thus, to answer this problematic, Meng et al. [3] designed a spiral shape nozzle which could be used to coat the inner wall of pipes. References [1] C.A. Bernard, H. Takana, G. Diguet, O. Lame, K. Ogawa, J.-Y. Cavaillé, Thermal gradient of polymeric particles during cold spray process, Computational Particle Mechanics, 2023, 10, 1697-1716 [2] W. Lock Sulen, C. Bernard, S. Onodera, J. Ishizaki, N. Mary, Y. Ichikawa, K. Ogawa, Improvement of deposition efficiency and adhesion by laser surface texturing for cold sprayed fluoropolymer coating, Surface and Coating Technology, 2024, In Press. [3] Y. Meng, H. Saito, C.A. Bernard, Y. Ichikawa, K. Ogawa, Optimal design of a cold spray nozzle for inner-wall coating fabrication by combining CFD simulation and neural networks, Journal of Thermal Spray Technology, 2023, In press. □□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□ Polymer coating by cold spray process: a methodology □□□□□□□□□□□□□□□□□□□□□□□□□□□□ □□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□[1]□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□[2]□□□□□□□□[2]□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□ □□□□□[1] K. Hiramoto* et al., Electrochimica Acta, 458, (2023), 142507. [2] K. Hiramoto* et al., Electrochimica Acta, under review □□□□□□□□□□□□□□□□□□□□□
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