摘要
目的探究在限量供油条件下,润滑油中油性剂吸附对滑块-玻璃盘面接触润滑油膜的影响。方法利用面接触润滑油膜测量系统,测量了PAG基础油以及添加了0.1%硬脂酸和0.1%十八胺油性剂的同种基础油产生的润滑油膜厚度随速度的变化曲线,并对油性剂在盘表面的吸附进行了表征。结果在普通玻璃盘和紫外照射的玻璃盘两种条件下,有硬脂酸添加的PAG与纯PAG相比,润滑膜厚均降低,其中紫外照射玻璃盘下硬脂酸作用对膜厚的降低程度更为明显。在玻璃盘运转的最低速度和最高速度下,硬脂酸作用使普通玻璃盘膜厚降低量分别为0.25μm和0.64μm,降幅为44.2%和22.1%;紫外照射玻璃盘下膜厚降低量分别为0.38μm和0.91μm,降幅为61.5%和41.7%。对于紫外照射玻璃盘,硬脂酸吸附使润滑剂在润滑轨道上发生反润湿,呈液滴状分布,对应膜厚降低;十八胺使润滑剂呈离散条状分布,润滑油膜厚与PAG基础油相当,最低和最高速度下膜厚降低量分别为0.11μm和0.17μm,降幅为18.2%和8.1%。结论使用普通玻璃盘时,润滑油膜与滑块表面硬脂酸吸附膜的弱亲和性是导致相应润滑膜厚低于纯PAG基础油的主要原因。玻璃盘紫外照射促进油性剂在盘面的润滑轨道内吸附,润滑轨道内外形成张力梯度,引发润滑油流失,使润滑油膜厚度大幅降低。极性基团极性大小的差异,使添加十八胺产生了远高于添加硬脂酸的膜厚,影响了润滑轨道上润滑油的分布及供油。
The work aims to study the effect of oily additives on the lubrication films in a slider-on-disc conformal contact under conditions of limited lubricant supply.The conformal contact lubrication film measuring system was used to measure the base oil PAG and the same base oil with oily additives with stearic acid(0.1%)and octadecylamine(0.1%),to generate the variation curve of lubrication film thickness with speed and characterize the adsorption of oily additives on disc surface.Under the conditions of ordinary disc and UV-irradiated disc,the film thickness of PAG with stearic acid was always lower than that of pure PAG.Under the UV-irradiated disc,stearic acid significantly reduced the film thickness.Under the ordinary disc at the lowest speed and the highest speed,the film thickness of PAG with stearic acid reduced by 0.25μm and 0.64μm,with drop rate of 44.2%and 22.1%.However,under the UV-irradiated disc,the film thickness decreased by 0.38μm and 0.91μm,with drop rate of 61.5%and 41.7%.Moreover,on the UV-irradiated disc,the PAG with stearic acid appeared in the form of droplet due to dewetting from the stearic acid adsorption on the lubrication track and consequently the film thickness decreased.While the PAG with octadecylamine presented less dewetting on the lubrication track and stayed in the form of discontinuous narrow strips.The generated lubrication oil film thickness was almost equal to that from PAG base oil,the decrease of film thickness at the lowest and highest speed was only 0.11μm and 0.17μm,and the drop rate of film thickness was 18.2%and 8.1%.When an ordinary disc is used,the weak affinity between the oil film and the adsorption layer of stearic acid on the slider surface is the main cause for the corresponding lubrication oil film thickness being lower than that of pure PAG base oil.Moreover,the UV irradiation promotes the adsorption of oily additives on the lubrication track,and distinctive tension gradient is formed at the lubrication track boundary,which leads to lubricant escape,thus re
作者
韩露娟
郭峰
HAN Lu-juan;GUO Feng(Qingdao University of Technology,Qingdao 266520,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2020年第11期204-211,共8页
Surface Technology
基金
国家自然科学基金(51775286)。
关键词
油性剂
限量供油
动压润滑
紫外光照
膜厚
面接触
oily additives
limited lubricant supply
hydrodynamic lubrication
ultra-violet irradiation
film thickness
conformal contact
