Fabrication of micro-/nano-structured super-hydrophobic fluorinated polymer coatings by cold-spray

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

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

A fabrication of superhydrophobic Perfluoroalkoxy Alkane (PFA)coatings on stainless steel surfaces by cold-spray technique has been demonstrated in this work. The in-situ supersonic impact deposition and consolidation of finely divided 20–40 μm powder material yielded hydrophobic thin coatings of PFA which exhibited contact angles of 125° but high roll off angles of 60°. The deposition efficiencies were less than 0.5%, coating was mechanically very fragile and non-uniform. However, the cold-spray deposition efficiency was subsequently increased to almost 15% by performing simple modification of particle surface morphology by introducing organosilane coated nanoceramic layers on the PFA particles and by laser texturing the stainless steel substrate surfaces to form mountain-valley micro-structures. The nanoceramic interlayers formed bridge bonds at the particle-particle interface and laser texturing achieved efficient coating-substrate interlock. The improved coatings exhibited super-hydrophobic character with 160° contact angle and 6° roll-off angle. The superhydrophobicity was seen to be as a result of micro-/nano-structured surface consisting of papillae like structures capped by a layer of hydrophobic nanoceramic. The coating also exhibited excellent water repellency.

Original languageEnglish
Pages (from-to)17-24
Number of pages8
JournalSurface and Coatings Technology
Volume373
DOIs
Publication statusPublished - 2019 Sep 15

Keywords

  • Cold spray
  • PFA
  • Polymer
  • Superhydrophobic coating

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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