多尺度微结构对铝合金表面疏水性能的影响
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摘要
利用微铣削技术和电火花复合技术在铝合金表面加工微沟槽阵列结构。通过改变沟槽阵列凸台宽度,获得具有不同粗糙度因子的一级结构。采用不同脉宽参数对微沟槽阵列表面进行加工,获得具有不同粗糙度因子的二级结构。对具有不同粗糙度表面的疏水性能进行观测,并对其疏水机理进行分析。结果表明:在本征接触角为50°的铝合金表面,微铣削技术构建的单尺度微结构实现了铝合金表面从亲水向疏水的转变,微铣削-电火花复合加工的多尺度结构实现了铝合金表面的超疏水性能。在二级结构粗糙度恒定的基础上,随着一级沟槽凸起宽度的增大,铝合金表面的疏水性呈线性减小的趋势。当一级结构一定时,复合加工后的铝合金表面接触角随二级结构表面粗糙度的增加先增大后减小。水滴与一级结构的接触状态为Cassie与Wenzel之间的一种过渡状态,与二级微米级陨石坑结构的接触状态为Wenzel状态,与二级纳米级结构的接触状态为Cassie-Baxter状态。
The micro-groove array was fabricated by micro-milling technology and WEDM. The width of convex platform was changed to obtain the first order structure with different rough factors. A secondary structure with different rough factors was obtained by processing micro-groove surface with different pulse width parameters. The surface hydrophobic properties of different rough factors were observed and the hydrophobic mechanism was analyzed. The results show that, on the surface of the aluminum alloy with an intrinsic contact angle of 50°, the single-scale microstructure constructed by micro-milling technology realizes the transition from hydrophilic to hydrophobic on the surface of the aluminum alloy, and the multi-scale structure of micro-milling-EDM processing achieves the superhydrophobic performance of the aluminum alloy surface. When the secondary structure is certain, the contact angle of the aluminum alloy surface machined by composite machining decreases linearly with the increase of the roughness factor of the first order structure. When the first order structure is certain, the contact angle of the aluminum alloy surface after the composite processing increases firstly and then decreases with the increase of the surface roughness. The contact state of primary structure is a transitional state between Cassie model and Wenzel model, the contact state of the micron crater is Wenzel state, and the contact state of the nano scale structure is Cassie-Baxter state.
The micro-groove array was fabricated by micro-milling technology and WEDM. The width of convex platform was changed to obtain the first order structure with different rough factors. A secondary structure with different rough factors was obtained by processing micro-groove surface with different pulse width parameters. The surface hydrophobic properties of different rough factors were observed and the hydrophobic mechanism was analyzed. The results show that, on the surface of the aluminum alloy with an intrinsic contact angle of 50°, the single-scale microstructure constructed by micro-milling technology realizes the transition from hydrophilic to hydrophobic on the surface of the aluminum alloy, and the multi-scale structure of micro-milling-EDM processing achieves the superhydrophobic performance of the aluminum alloy surface. When the secondary structure is certain, the contact angle of the aluminum alloy surface machined by composite machining decreases linearly with the increase of the roughness factor of the first order structure. When the first order structure is certain, the contact angle of the aluminum alloy surface after the composite processing increases firstly and then decreases with the increase of the surface roughness. The contact state of primary structure is a transitional state between Cassie model and Wenzel model, the contact state of the micron crater is Wenzel state, and the contact state of the nano scale structure is Cassie-Baxter state.
引文
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