Thermal gradient of in-flight polymer particles during cold spraying

C. A. Bernard, H. Takana, G. Diguet, K. Ravi, O. Lame, K. Ogawa, J. Y. Cavaillé

Research output: Contribution to journalArticlepeer-review

Abstract

The manufacture of polymer coatings via the cold-spray process remains challenging owing to the viscoelastic-viscoplastic behavior exhibited by polymers. One crucial step to improve cold-spray polymer coating is to determine the particles’ thermal history during their flight from inside the nozzle to their impact on the substrate. In this study, we propose estimating the velocity and temperature of an isolated polymer particle traveling through a nozzle with a sharp change in its cross-section. The preliminary results show that the geometric discontinuity constricts the flow, thereby increasing the particle velocity. Moreover, a significant thermal gradient is expected inside the particle, which in turn leads to a gradient of mechanical properties of the polymeric particle during impact.

Original languageEnglish
Article number116805
JournalJournal of Materials Processing Technology
Volume286
DOIs
Publication statusPublished - 2020 Dec

Keywords

  • Cold spray
  • Fluid dynamics
  • Particle velocity
  • Polymer
  • Thermal gradient

ASJC Scopus subject areas

  • Ceramics and Composites
  • Computer Science Applications
  • Metals and Alloys
  • Industrial and Manufacturing Engineering

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