摘要
在滑动轴承的实际应用中,难以避免水对润滑油的侵入污染;因此对油水乳化液的润滑研究至关重要。为探索轴承启停过程中油水乳化液的摩擦学行为及规律,研究了不同水含量对于油水混合体系边界润滑性能及磨损状况的影响。发现在含水量低于99.75%的乳化液中轴承钢间的摩擦因数与纯油润滑时相近,但磨损状况较纯油差;综合摩擦因数与磨损量测试,认为含水量为30%的乳化液,其减摩抗磨效果接近纯油润滑的情况。通过黏度和润湿行为的观测,给出了油水乳化液对于润滑作用机制的原理分析。当乳化液进入润滑接触区时,由于液下超疏水性质,水相极易被挤出接触区,而油相则趋向于在试样表面润湿,从而形成润滑油膜,起到承载和润滑效果。
Oil-water emulsion generally exists in the actual application of the sliding bearings.Hence,the lubricating property of emulsion is of great value for engineering.In order to explore the tribological behaviour of oil-water emulsion during the bearing start-stop process,effects of oil-water emulsions with different water content on boundary lubrication have been investigated.It is found that the friction coefficient of emulsion with water content less than 99.75wt%is almost similar to that of pure oil,while the wear performance is much worse.Combining the friction and wear results,the emulsion with water content of 30wt%is considered as the acceptable choice for the engineering applications.By investigating the viscosity and wetting behaviours,the lubrication mechanism of oil-water emulsion has been discussed.Owing to the better wettability than water,the oil phase in emulsion preferentially forms oil film on bearing steel surface,which acts an important role in bearing and lubrication.
作者
刘宸旭
陈朝浪
张继平
戴媛静
LIU Chenxu;CHEN Chaolang;ZHANG Jiping;DAI Yuanjing(Tianjin Research Institute for Advanced Equipment,Tsinghua University,Tianjin 300300;State Key Laboratory of Tribology,Tsinghua University,Beijing 100084)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2019年第9期48-54,共7页
Journal of Mechanical Engineering
基金
国家自然科学基金(51727901)
天津市科技计划(17YFCZZC00380)资助项目
关键词
油包水
水包油
乳化液
边界润滑
摩擦磨损
water-in-oil
oil-in-water
emulsion
boundary lubrication
friction
