Effect of Nanosecond Laser Machining and Heat-Treatment on Wettability of Pure Aluminum Surface
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摘要: 采用纳秒激光加工技术在纯铝板表面制备微纳米结构，之后进行150 ℃×2 h的热处理，研究激光扫描间距（0.005~0.020 mm）、扫描速度（100~1 700 mm·s-1）与热处理对激光烧蚀表面润湿性的影响。结果表明：不同工艺参数下激光烧蚀后纯铝板表面均形成了相对规则的微纳米网格结构；激光烧蚀后的纯铝板表面为超亲水表面，再经热处理后变为疏水表面或超疏水表面；随着扫描速度和扫描间距的增大，激光烧蚀和热处理后，纯铝板表面的接触角变化不明显，滑动角增大，表现出不同程度的润湿性；在激光扫描速度为100 mm·s-1，扫描间距为0.005 mm下激光烧蚀与热处理后，纯铝板表面微纳米结构致密，其接触角为155.6°，滑动角为4°，超疏水性最佳。Abstract: The micro-nano structure was prepared on the surface of pure aluminum plate by nanosecond laser machining technique, and then was heat-treated at 150 ℃ for 2 h. The effect of laser scanning interval (0.005-0.020 mm), scanning speed (100 -1 700 mm·s-1) and heat treatment on the wettability of the pure aluminum plate surface after laser ablation was studied. The results show that the regular micro-nano grid structure was formed on the surface of pure aluminum plate after laser ablation with different process parameters. The pure aluminum plate surface after laser ablation was super hydrophilic, and after heat treatment changed to be hydrophobic or even super-hydrophobic. With increasing scanning speed and scanning interval, the contact angle of pure aluminum plate surface after laser ablation and heat treatment changed little, and the sliding angle increased; the surface showed different degrees of wettability. After laser ablation with laser scanning speed of 100 mm·s-1 and scanning interval of 0.005 mm and heat treatment, the pure aluminum plate surface had dense micro-nano structure, and the best super-hydrophobicity with contact angle of 155.6° and sliding angle of 4°.
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Keywords:
- nanosecond laser /
- pure aluminum /
- super-hydrophobicity /
- micro-nano structure /
- contact angle
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