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首页> 外文期刊>Scientific reports. >Robust Hydrophobic Surfaces from Suspension HVOF Thermal Sprayed Rare-Earth Oxide Ceramics Coatings
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Robust Hydrophobic Surfaces from Suspension HVOF Thermal Sprayed Rare-Earth Oxide Ceramics Coatings

机译：悬浮HVOF热喷涂稀土氧化物陶瓷涂层的坚固疏水表面

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摘要

This study has presented an efficient coating method, namely suspension high velocity oxy-fuel (SHVOF) thermal spraying, to produce large super-hydrophobic ceramic surfaces with a unique micro- and nano-scale hierarchical structures to mimic natural super-hydrophobic surfaces. CeO2 was selected as coatings material, one of a group of rare-earth oxide (REO) ceramics that have recently been found to exhibit intrinsic hydrophobicity, even after exposure to high temperatures and abrasive wear. Robust hydrophobic REO ceramic surfaces were obtained from the deposition of thin CeO2 coatings (3–5?μm) using an aqueous suspension with a solid concentration of 30 wt.% sub-micron CeO2 particles (50–200?nm) on a selection of metallic substrates. It was found that the coatings’ hydrophobicity, microstructure, surface morphology, and deposition efficiency were all determined by the metallic substrates underneath. More importantly, it was demonstrated that the near super-hydrophobicity of SHVOF sprayed CeO2 coatings was achieved not only by the intrinsic hydrophobicity of REO but also their unique hierarchically structure. In addition, the coatings’ surface hydrophobicity was sensitive to the O/Ce ratio, which could explain the ‘delayed’ hydrophobicity of REO coatings.
机译：这项研究提出了一种有效的涂覆方法，即悬浮高速含氧燃料（SHVOF）热喷涂，以生产具有独特的微米和纳米级层次结构的大型超疏水陶瓷表面，以模仿自然的超疏水表面。 CeO2被选作涂料材料，这是最近发现的一组稀土氧化物（REO）陶瓷中的一种，即使暴露在高温和磨蚀下也具有固有的疏水性。通过选择固体成分浓度为30 wt。％的亚微米CeO2颗粒（50–200？nm）的水悬浮液，通过薄CeO2涂层（3-5 µm）的沉积，可以获得坚固的疏水REO陶瓷表面。金属基材。结果发现，涂层的疏水性，微观结构，表面形态和沉积效率均由下面的金属基材决定。更重要的是，已证明SHVOF喷涂的CeO2涂层几乎具有超疏水性，这不仅是由于REO的固有疏水性，而且还因为它们独特的层次结构。此外，涂料的表面疏水性对O / Ce比敏感，这可以解释REO涂料的“延迟”疏水性。

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