硬脂酸界面修饰对油膜润滑影响的试验研究  

Effect of Interface Modification of Stearic Acid on Oil Film Lubrication

作　　者：韩露娟 郭峰 栗心明 李书义 HAN Lujuan;GUO Feng;LI Xinming;LI Shuyi(School of Mechanical and Automotive Engineering,Qingdao University of Technology,Qingdao 266520)

机构地区：[1]青岛理工大学机械与汽车工程学院,青岛266520

出　　处：《机械工程学报》2022年第9期182-189,共8页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(51775286,51875299)。

摘　　要：研究了有限量供油条件下,硬脂酸界面修饰对滑块-玻璃盘面接触条件下油膜润滑的影响。利用面接触润滑油膜测量系统,作者测量了PAO10、甲基硅油基础油以及添加了0.1%硬脂酸的同种基础油产生的润滑油膜厚度随速度的变化曲线,理论计算了连续双侧脊薄油层和离散液滴供油条件下的油膜厚度,并对硬脂酸在盘表面的吸附进行了表征。结果表明,硬脂酸吸附层使润滑轨道表面能降低,其上润滑油发生“反润湿”呈现液滴状分布,该分布能够增高润滑膜厚;硬脂酸吸附使固体表面产生致密膜,表面粗糙度降低;离散油滴经接触区被压塌成为连续油层分布,再次恢复到离散态需要一定时间,这与固体表面吸附层密切相关;此外,二甲基硅油能够促进硬脂酸吸附,增大玻璃盘基体改性程度和润滑油膜厚度。The effect of the interface modification by stearic acid has been studied on the oil film lubrication in a slider-on-disc conformal contact under conditions of limited lubricant supply.Using an optical slider bearing test rig,the authors measured the lubrication film thickness versus speed by the base oil PAO10,Silicone oil,and the same base oil with stearic acid(0.1%),calculated the lubrication film thickness under the conditions of continuous double-side ridge thin oil layer and discrete droplet oil supply conditions in theory,and the stearic acid adsorption on the disc surface is characterized.The results showed that the adsorption layer of the stearic acid leads to the low surface energy of the lubrication track,which presents the oil in the form of droplets and promotes the increase of the film thickness.The bounding solid presents a more dense and smooth surface layer due to the adsorption of stearic acid.The discrete oil droplets are crushed into a continuous oil layer through the contact area,and it takes some time for this oil layer to change to discrete droplets,which depends on the properties of the adsorption layer.Moreover,silicone oil can enhance the adsorption of stearic acid,and thus more effective surface modification is obtained and the film thickness increases.

关 键 词：硬脂酸 吸附膜 限量供油 流体动压润滑 膜厚 

分 类 号：TH117[机械工程—机械设计及理论]