润湿性梯度集油表面制备及摩擦性能研究*

为了解决润滑油发生迁移，使接触面润滑油中断，导致润滑失效的问题，制备一种具有高集油性能的疏油-亲油-疏油的梯度表面。采用化学气相沉积的方法，在硅片表面沉积一层单分子膜，并采用接触角测量仪、UMT摩擦磨损试验机、共聚焦显微镜等对该样品进行表征，研究该类表面在限量供油条件下的润滑性能。结果表明：将油滴滴在疏油/亲油交界处，油滴能够迅速地从疏油区域向亲油区域运动；点接触往复运动摩擦实验结果表明，梯度表面硅片的摩擦因数明显低于原始的硅片，且梯度表面硅片的表面磨痕深度比原始硅片浅。各种实验结果表明，所制备的疏油-亲油-疏油梯度表面能够起到集油的作用，避免了润滑油中断的问题。

Preparation and Friction Properties of Oil Collecting Surface

In order to solve the problem of lubrication failure caused by lubricating oil migration and the interrupt of lubricating oil on contact surface,the gradient surface of oleophobic-oleophilic-oleophobic with high oil collecting performance was prepared.A layer of monolayer film was deposited on the surface of silicon wafer by chemical vapor deposition method,and the sample was characterized by contact angle measuring instrument,UMT friction and wear tester,confocal microscope,etc.The lubrication performance of this surface was studied under the condition of limited oil supply.It is found that the oil droplets can move rapidly from the oil-phobic region to the oil-wet region when the oil drops are placed at the oil-phobic/oil-wet junction.The experimental results of point contact reciprocating friction show that the friction coefficient of the silicon wafer with gradient surface is significantly lower than that of the original silicon wafer,and the wear mark depth of the silicon wafer with gradient surface is shallower than that of the original silicon wafer.Various experimental results show that the prepared oil-phobic-oleophilic-oleophobic gradient surface can play the role of oil collection and avoid the problem of lubricating oil interruption.