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Deposition Mechanism Analysis of Cold-Sprayed Fluoropolymer Coatings and Its Wettability Evaluation

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Abstract

Polymer coating by cold spray presents interesting features such as the possibility of protecting metallic substrates or adding functionalities to a structure. However, it is characterized by a low deposition efficiency and a weak interface between the substrate and the coating. In this study, we performed fluoropolymer coatings by the cold-spray process. Analysis of the particle deposition during cold spray highlighted the importance of the particle size, substrate temperature and inlet gas temperature and pressure on the adhesion polymer/substrate. The addition of hydrophobized fumed nano-ceramics (FNC) to the polymer feedstock enhances the deposition efficiency and polymer adhesion on the substrate. The addition of fumed nano-alumina (FNA) to the polymer feedstock tends to give better results than fumed nano-silica in terms of deposition efficiency thanks to (1) the difference in surface charge leading to the attractive force between the polymer and the FNA during the powder preparation stage and (2) a homogeneous repartition of the FNA on the polymer particle surface. In addition, the hydrophobization of the FNC maintains and enhances the hydrophobicity and water repellency properties of the fluoropolymer coating.

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Acknowledgments

Authors would like to acknowledge Japan Society for the Promotion of Science (JSPS) Kakenhi, for the financial assistance throughout the work (Grant-in-Aid for Scientific Research(A)17H01235). We extended our acknowledgement to Nippon Aerosil Co. (NAC) for providing the fumed nano-alumina and Iwate Industrial Research Institute, Dr. Nicolas Mary and Mr. Katsumi Ito for their assistance and invaluable guidance.

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  1. Kesavan Ravi

    Present address: Indian Institute of Technology (Indian School of Mines) Dhanbad, Dhanbad, India

Authors and Affiliations

  1. Fracture and Reliability Research Institute, Tohoku University, Sendai, Japan

    Wesley Lock Sulen, Kesavan Ravi, Chrystelle Bernard, Yuji Ichikawa & Kazuhiro Ogawa

  2. ELyTMaX UMI 3757, CNRS – Université de Lyon – Tohoku University, International Joint Unit, Tohoku University, Sendai, Japan

    Kesavan Ravi, Chrystelle Bernard & Kazuhiro Ogawa

  3. Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai, Japan

    Chrystelle Bernard

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Lock Sulen, W., Ravi, K., Bernard, C. et al. Deposition Mechanism Analysis of Cold-Sprayed Fluoropolymer Coatings and Its Wettability Evaluation. J Therm Spray Tech 29, 1643–1659 (2020). https://doi.org/10.1007/s11666-020-01059-w

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