Despite the existence of several methods for production of superhydrophobic coatings from various materials, their application in harsh environments is still a great challenge. In this work, WC-Co-Cr cermet coatings were prepared by means of high velocity oxy-fuel (HVOF) spraying. WC particles dispersed in Co-Cr metallic matrix allowed to form the multi-scale surface roughness and thus to achieve hydrophobicity of the coatings in the as-sprayed state. The additional surface treatment by the silicone oil rendered the coatings superhydrophobic. The WC-Co-Cr coatings were fabricated from three different powder feedstocks: coarse powder with coarse WC particles, coarse powder with ultrafine WC particles, and fine powder with ultrafine WC particles. The investigation of microstructure, phase composition, and surface topography of produced coatings was conducted to study the influence of these factors on the water contact angle and surface free energy, which were obtained by the sessile droplet method. Theoretical models were used to explain the wetting behavior of all the coatings. Finally, preliminary results of the slurry abrasion response test revealed very good robustness of hydrophobicity of the coatings and also pointed to a need for further research on surface modifications for sacrificial applications.

中文翻译：

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HVOF 生产的耐磨 WC-Co-Cr 金属陶瓷涂层的润湿行为：化学成分和表面粗糙度的作用

尽管存在多种由各种材料生产超疏水涂层的方法，但它们在恶劣环境中的应用仍然是一个巨大的挑战。在这项工作中，WC-Co-Cr 金属陶瓷涂层是通过高速氧燃料 (HVOF) 喷涂制备的。分散在 Co-Cr 金属基体中的 WC 颗粒允许形成多尺度表面粗糙度，从而在喷涂状态下实现涂层的疏水性。硅油的额外表面处理使涂层具有超疏水性。WC-Co-Cr 涂层由三种不同的粉末原料制成：带有粗 WC 颗粒的粗粉、带有超细 WC 颗粒的粗粉和带有超细 WC 颗粒的细粉。微观结构、相组成的研究，并对制备的涂层的表面形貌进行了研究，以研究这些因素对通过固着液滴法获得的水接触角和表面自由能的影响。理论模型用于解释所有涂层的润湿行为。最后，浆料磨损响应测试的初步结果表明涂层疏水性非常好，也表明需要进一步研究牺牲应用的表面改性。