楔形亲油轨道-超疏水复合图案化表面液滴引导及润滑增效研究  

Wedge-shaped Oleophilic Track-superhydrophobic Composite Patterned Surface for Droplet Guidance and Lubrication Synergy

作　　者：陈佳伟 李晓莹 郭世理 张辉[1] CHEN Jia-wei;LI Xiao-ying;GUO Shi-li;ZHANG Hui(Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安交通大学现代设计及转子轴承系统教育部重点实验室,西安710049

出　　处：《表面技术》2023年第11期40-48,共9页Surface Technology

基　　金：国家自然科学基金(52075418)。

摘　　要：目的实现液滴及润滑油在超疏水表面定向引导,并将其运用于机械摩擦副,改善摩擦润滑性能。方法提出一种简单的超疏水高疏油涂层制备方法,即在硅烷耦合剂作用下利用1H,1H,2H,2H-全氟癸基三乙氧基硅烷(FAS-17)改性气相纳米二氧化硅,经交联固化处理后制得具有超疏水高疏油特性的涂层。通过FT-IR分析涂层成分、SEM观测涂层形貌,验证了涂层制备方案的有效性。通过纳秒激光在疏油涂层上加工亲油楔形图案化表面,进行表面流体引导实验。通过开展球-盘标准摩擦实验和滚动轴承温升实验来验证楔形亲油图案化表面流体引导,用于实现机械摩擦润滑增效的有效性。结果通过对涂层表面进行成分分析,验证了C-F键长链在二氧化硅粒子表面上的成功枝接。通过对涂层表面进行形貌观测,验证了表面微纳米粗糙结构的成功构建。所制备得到涂层表面去离子水、PAO4、石蜡油、白油、PAO6、齿轮油接触角分别为157°、142°、143°、144°、136°、145°。相比之下,普通铝板表面去离子水、PAO4、石蜡油、白油、PAO6、齿轮油接触角分别为46°、16°、17°、20°、15°、24°,涂层具有优异的超疏水高疏油特性。通过液滴引导实验,确定液滴引导的楔形最优参数(长度L=30 mm,间距d=0.3 mm、宽度W=0.9 mm),并且楔形亲油图案化表面能够实现液滴的曲线以及逆重力定向运输。球-盘摩擦实验表明,楔形亲油图案化表面在不同工况下均可以有效降低摩擦因数,在低速重载条件下摩擦因数降低了16%。轴承温升实验表明,在转速相同的情况下,带有楔形亲油图案化表面的轴承温升均明显低于普通轴承。结论本文制备的涂层展现出超疏水、高疏油特性,同时设计的楔形亲油图案化表面成功实现了对水、润滑油的定向引导,使得润滑增效。To realize the directional guidance of droplets and lubricating oil on the superhydrophobic surface and apply it to mechanical friction pairs to improve the friction and lubrication performance,a simple and efficient method was used to prepare the superhydrophobic and highly oleophobic coating and wedge-shaped oleophilic patterns to realize the directional guidance of droplets on patterned surfaces.Gas-phase nano-silica,silane coupling agent and 1H,1H,2H,2H-perfluorodecyltriethoxysilane were added to absolute ethanol respectively.Under the action of silane coupling agent,1H,1H,2H,2H-perfluorodecyltriethoxy-silane was used to modify fumed nano-silica.Then epoxy resin and curing agent were added to prepare coating solution with superhydrophobic and high oleophobic characteristics.The composition of the prepared coating was analyzed by FT-IR.It was verified that the oleophobic C-F bond long chain was successfully grafted on the surface of silica particles.A scanning electron microscope(SEM)was used to observe the morphology of the coating,which proved the successful construction of micro-nano rough structure on the surface.The contact angles of 8mL different droplets on the coating surface were measured by a contact angle measuring instrument.The contact angles of deionized water,PAO4,paraffin oil,white oil,PAO6 and gear oil on the coating surface were 157°,142°,143°,144°,136°and 145°.In contrast,the contact angles of deionized water,PAO4,paraffin oil,white oil,PAO6 and gear oil on the surface of the ordinary aluminum plate were 46°,16°,17°,20°,15°and 24°respectively,which proved that the coating had excellent superhydrophobic and high oleophobic properties.Aiming at the abrasion resistance of superhydrophobic coating,the abrasive paper abrasion experiment was carried out.After 50 cycles of experiments,the contact angle of deionized water decreased from 157°to 152°,and the contact angle of gear oil decreased from 145°to 134.6°,which proved that the coating had certain abrasion resistance.Finally,a na

关 键 词：超疏水高疏油涂层 亲油楔形图案 纳秒激光 液体单向引导 润滑增效 

分 类 号：TH117[机械工程—机械设计及理论] O647[理学—物理化学]