表面技术2025，Vol.54Issue(9)：70-78,9.DOI:10.16490/j.cnki.issn.1001-3660.2025.09.005
球-盘点接触下有机摩擦改进剂对矿物油润滑特性的影响
Effect of Organic Friction Modifiers on Lubrication Characteristics of Mineral Oil under Ball-to-Disk Contact
摘要
Abstract
The work aims to investigate the effect of in-situ adsorption of organic friction modifier molecules with various functional group polarities on elastohydrodynamic lubrication(EHL).Mineral oil 500SN and 500SN with 3 organic friction modifiers,i.e.4%oleyl alcohol,4%oleamide and 4%oleic acid(labeled respectively 500SNOH,500SNCONH2 and 500SNCOOH)were used as the lubricants.With an optical ball-on-disk test machine,the oil film thickness and the friction coefficient of 500SN,500SNOH,500SNCONH2 and 500SNCOOH were measured at various slide-roll ratios and entrainment speeds.The organic friction modifiers adsorbed on the surface of steel balls were characterized by contact angle(CA)measuring instrument,Fourier transform infrared spectrometer(FTIR)and atomic force microscope(AFM),and the relationship between the strength of adsorption of organic friction modifier molecules and the functional group polarity was determined.Under the same working conditions,the central film thickness and the friction coefficient of 500SNOH,500SNCONH2 and 500SNCOOH were all lower than those of 500SN,and the greater the polarity of the functional group of the organic friction modifier the lower the film thickness and the friction coefficient.The oleic acid molecule in 500SNCOOH had the greatest polarity and the strongest adsorption capacity,resulting in the lowest film thickness and friction coefficient,while the oleyl alcohol molecule had the weakest adsorption,presenting the lowest film thickness and friction coefficient of 500SNOH among the lubricants with organic friction modifiers.Under the conditions of low slide-roll ratios,the friction coefficients of 500SN,500SNOH,500SNCONH2 and 500SNCOOH all showed a trend of first decreasing and then increasing with the increase of entrainment speed.At the slip-roll ratio of 0.05,the average friction coefficients of 500SNOH,500SNCONH2 and 500SNCOOH presented decrease by 6.07%,15.79%and 24.57%,respectively,in the range of 1-512 mm/s,compared with 500SN.Under the condition of large slip-roll ratio,the friction coefficients of 500SN,500SNOH,500SNCONH2 and 500SNCOOH all decreased first,then increased and decreased with the increase of entrainment speed.Under the condition of low entrainment speed,due to shear thinning and some heat generation,the central oil film thickness of 500SN,500SNOH,500SNCONH2 and 500SNCOOH decreased with the increase in the slip-roll ratio.At the entrainment speed of 32 mm/s and slip-roll ratio of 0.05,the central oil film thickness of 500SNOH,500SNCONH2 and 500SNCOOH decreased by 15.32%,22.58%and 26.61%,respectively,compared with 500SN.When increased entrainment speed was used,with the increasing slide-roll ratio,more heat was generated and the temperature-viscosity wedge was induced,where the central oil film thickness of 500SN,500SNOH,500SNCONH2 and 500SNCOOH could not decrease,which was contrary to those at the entrainment speed of 32 mm/s.The measurement results of contact angle,Fourier infrared spectrometer and atomic force microscope show that the organic friction modifiers with different functional groups can form an oleophobic boundary film on the surface of the steel ball by in-situ adsorption,thus reducing the wettability of the lubricant on the surface of the steel ball.It is also verified that the stronger the polarity of the organic friction modifier molecular functional group,the stronger the adsorption capacity of the organic friction modifier molecule and the poorer the wettability of the formed oleophobic boundary film.关键词
全膜润滑/有机摩擦改进剂/500SN/油膜厚度/摩擦因数/润湿性Key words
full film lubrication/organic friction modifiers/500SN/film thickness/friction coefficient/wettability分类
机械工程引用本文复制引用
安丰阳,郭峰,刘成龙,鞠超,王晓波..球-盘点接触下有机摩擦改进剂对矿物油润滑特性的影响[J].表面技术,2025,54(9):70-78,9.基金项目
国家自然科学基金(52175173) （52175173）
山东省重大科技创新工程(2022CXGC020309) National Natural Science Foundation of China(52175173) （2022CXGC020309）
Key Project of Scientific and Technological Innovation in Shandong Province(2022CXGC020309) （2022CXGC020309）
