Fabrication of micro-/nano-structured super-hydrophobic fluorinated polymer coatings by cold-spray
Fabrication of micro-/nano-structured super-hydrophobic fluorinated polymer coatings by cold-spray
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DOI：
10.1016/j.surfcoat.2019.05.078
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发表时间：
2019-09
影响因子：
5.4
通讯作者：
K. Ravi;W. L. Sulen;C. Bernard;Y. Ichikawa;K. Ogawa
中科院分区：
文献类型：
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作者：
K. Ravi;W. L. Sulen;C. Bernard;Y. Ichikawa;K. Ogawa
采用冷喷涂技术在不锈钢表面制备了超疏水全氟烷氧基烷烃（PFA）涂层。对20 ~ 40 μm粉末材料进行原位超声冲击沉积固结，得到了接触角为125°、滚脱角为60°的疏水PFA薄膜。沉积效率低于0.5%，涂层机械脆性和不均匀。然而，通过在PFA颗粒上引入有机硅烷涂层纳米陶瓷层，并通过激光对不锈钢衬底表面进行纹理处理，形成山谷微结构，从而对颗粒表面形貌进行简单的修饰，冷喷涂沉积效率随后提高到近15%。纳米陶瓷中间层在粒子-粒子界面形成桥键，激光织构实现了涂层-衬底的高效互锁。改进后的涂层具有160°接触角和6°滚脱角的超疏水性。超疏水性被认为是由于微/纳米结构的表面由一层疏水纳米陶瓷覆盖的乳头状结构组成。该涂层还表现出优异的拒水性。
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.