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

SURFACE & COATINGS TECHNOLOGY

卷:373

Article

Ravi, Kesavan^1,2,3,4  Sulen, Wesley Lock¹  Bernard, Chrystelle^1,2,3,4,5  Ichikawa, Yuji¹  Ogawa, Kazuhiro^1,2,3,4 

[1] Tohoku Univ, Fracture & Reliabil Res Inst, Sendai, Miyagi, Japan

[2] CNRS, ELyTMaX, Paris, France

[3] Tohoku Univ, Sendai, Miyagi, Japan

[4] Univ Lyon, Lyon, France

[5] Tohoku Univ, Frontier Res Inst Interdisciplinary Sci, Sendai, Miyagi, Japan

关键词: Superhydrophobic coating;    Cold spray;    Polymer;    PFA;   

DOI  :  10.1016/j.surfcoat.2019.05.078

来源: Elsevier

【 摘 要 】

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 mu m powder material yielded hydrophobic thin coatings of PFA which exhibited contact angles of 125 degrees but high roll off angles of 60 degrees. 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 degrees contact angle and 6 degrees roll-off angle. The super-hydrophobicity 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.

【 授权许可】

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