SiC/Al复合材料超疏水表面的制备

Preparation of superhydrophobic surface based on SiC/Al composite

采用化学刻蚀法在SiC/Al复合材料表面构筑微纳结构,通过SEM和表面接触角测量仪分析刻蚀表面的微观形貌特征及润湿特性,并探讨了其与刻蚀时间之间的关系;借助热震试验评价SiC/Al复合材料超疏水表面的温度骤变耐受特性。结果表明:弥散分布的微米级SiC颗粒的存在使得刻蚀后的SiC/Al复合材料表面易形成由微米级粒状结构和纳米级凹坑结构复合而成的微观结构;氟硅烷修饰后的蚀刻表面的接触角最高达到166.8°,滚动角最低为3°,具有很好的超疏水特性;SiC/Al基超疏水表面具有较好的耐受温度骤变特性。

The chemical etching technique was applied to prepare surface texture of SiC/Al composites.The microtopography characteristics and wetting behaviors of the etched surfaces as well as their dependencies on etching time were analyzed by SEM and a contact angle meter.The temperature shock resistance of the SiC/Al superhydrophobic surfaces were evaluated by thermal shock tests.The results indicate that SiC/Al composite can be easily etched chemically to form distinct hierarchical structures integrating particle-shaped microstructures and nano-sized pit structures mainly due to the existence of SiC microparticles served as the bodies of microstructure,the etched surfaces modified by fluorosilane coating show excellent superhydrophobicity with a water contact angle of up to 166.8°and a small slide angle of as low as 3°,the SiC/Al superhydrophobic surfaces possess a favorable temperature shock resistance.