Fabrication of hierarchical structures on titanium alloy surfaces by nanosecond laser for wettability modification
Fabrication of hierarchical structures on titanium alloy surfaces by nanosecond laser for wettability modification
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DOI：
10.1016/j.optlastec.2021.107728
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发表时间：
2022-04-01
影响因子：
5
通讯作者：
Hu, Jun
中科院分区：
文献类型：
--
作者：
Guo, Chunfang;Zhang, Meiju;Hu, Jun
钛合金具有密度低、比强度高、耐高温等优点，在航空航天工业中得到了广泛的应用。为了拓宽钛合金的应用范围，在某些场合要求钛合金具有超疏水性，如自清洁、防冰等。在这项研究中，直接纳秒激光烧蚀制备不同的坑与层次结构的钛合金基板上，然后与化学处理，以改变表面的润湿性。系统研究了激光加工参数对表面形貌和表面润湿性的影响。结果表明，增加扫描次数可以增加凹坑的深度，并增加凹坑周围微纳结构的积累。扫描间距主要影响热影响区的重叠，从而影响激光诱导的分层结构的分布。激光加工表面的润湿性由表面粗糙度和表面化学决定，粗糙表面的固体分数由扫描次数和扫描空间调节。此外，激光处理后的钛合金表面化学处理，获得超疏水表面，这是上述应用的巨大潜力。
Titanium alloy is widely used in aerospace industry due to its low density, high specific strength and hightemperature resistance. To broaden its application scope, superhydrophobicity of titanium alloy is required in certain situations, such as self-cleaning and anti-icing. In this study, direct nanosecond laser ablation was applied to fabricate distinct pits with hierarchical structures on titanium alloy substrates, followed with chemical treatment to modify the wettability of the surfaces. The effects of laser processing parameters on surface morphology and surface wettability were explored systematically. Results show that, increasing the number of scans improves the depth of the pits and the accumulation of the micro-nano structures around the craters. The scanning space mainly affects the overlap of the heat affected zones, and hence the distribution of the laserinduced hierarchical structures. The wettability of a laser processed surface is determined by both surface roughness and surface chemistry, and the solid fraction of the rough surface is regulated by the number of scans as well as the scanning space. Moreover, superhydrophobic surfaces are obtained on the laser processed titanium alloy after chemical treatment, which has great potential for the as-mentioned applications.