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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 micro / nano structure was constructed on the surface of SiC / Al composites by chemical etching. The micro-topography and wetting characteristics of the etched surface were analyzed by SEM and surface contact angle measuring instrument. The relationship between the micro-nano structure and the etching time The thermal shock resistance test was used to evaluate the resistance to sudden change of temperature on the superhydrophobic surface of SiC / Al composites. The results show that the microstructure of the SiC / Al composites is easily formed by the combination of micron-scale granular structure and nanoscale pits. The fluorinated silane-modified etched surface Has the best contact angle up to 166.8 ° and the lowest roll angle of 3 °, which has good superhydrophobic properties. The SiC / Al-based superhydrophobic surface has better resistance to sudden change in temperature.