电火花线切割制备超疏水多孔钛及其油水分离的应用

Preparation of superhydrophobic porous titanium by wire electricaldischarge machining and its application in oil-water separation

利用电火花线切割的方法制备具有双尺度结构的超疏水多孔钛表面,用于实现油水混合物的分离。以多孔钛为基材,通过电火花线切割的方法在表面加工出阵列微沟槽结构,该表面经过全氟癸基三乙氧基硅烷的低表面能修饰后,制得超疏水多孔钛表面。利用接触角测试仪和电子显微镜等手段对超疏水多孔钛表面进行润湿性测量和形貌特征的分析,利用油水分离器测试超疏水多孔钛的油水分离能力。制备的超疏水多孔钛表面的接触角为162.6°,滚动角为0.5°,表现出低的粘附性。在油水分离试验中,超疏水多孔钛对于不同的油水混合物的分离率超过98%,耐压性测试发现该表面具有较好的耐压性能。化学稳定性测试和耐腐蚀性测试表明,超疏水多孔钛比基材具有更好的化学稳定性和耐腐蚀性。

A superhydrophobic porous titanium surface with dual-scale structure is prepared by wire electrical discharge machining(WEDM)and realized the separation of oil-water mixtures.An array structure of grooves is processed on the porous titanium surfaces by WEDM.Then a superhydrophobic porous titanium is prepared by a modification with perfluorodecyltriethoxysilane.The wettability and morphology of the porous titanium surface are characterized by the contact angle tester and SEM.And oil-water separation performance is tested by oil-water separator.The as-prepared porous titanium surfaces exhibit superhydrophobility with a contact angle of 162.6°and a slide angle of 0.5°and show low adhesion.The surface achieves oil-water separation on different oil-water mixtures with separation efficiency over 98%and pressure resistance test indicates the surface had good pressure resistance.Chemical stability test and corrosion resistance test show that superhydrophobic porous titanium has better chemical stability and corrosion resistance than the substrate.