张大同,杨淑燕,蔡美荣,郭峰.离子液体添加到废旧发动机油引起的摩擦学性能“再生”[J].表面技术,2021,50(9):196-204, 268.
ZHANG Da-tong,YANG Shu-yan,CAI Mei-rong,GUO Feng.Tribological Performance "Recovery" Caused by the Addition of Ionic Liquid to Used Engine Oil[J].Surface Technology,2021,50(9):196-204, 268
离子液体添加到废旧发动机油引起的摩擦学性能“再生”
Tribological Performance "Recovery" Caused by the Addition of Ionic Liquid to Used Engine Oil
投稿时间:2020-11-22  修订日期:2021-03-24
DOI:10.16490/j.cnki.issn.1001-3660.2021.09.020
中文关键词:  离子液体  润滑油再生  乏油  成膜特性  摩擦磨损
英文关键词:ionic liquid  oil recovery  starvation  film formation property  friction and wear
基金项目:国家自然科学基金项目(51775287,51605470);国家固体润滑重点实验室开放基金项目(LSL-1712)
作者单位
张大同 青岛理工大学 机械与汽车工程学院,山东 青岛 266520 
杨淑燕 青岛理工大学 机械与汽车工程学院,山东 青岛 266520;中国科学院兰州化学物理研究所 固体润滑国家重点实验室,兰州 730000 
蔡美荣 中国科学院兰州化学物理研究所 固体润滑国家重点实验室,兰州 730000 
郭峰 青岛理工大学 机械与汽车工程学院,山东 青岛 266520 
AuthorInstitution
ZHANG Da-tong School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China 
YANG Shu-yan School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China;State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China 
CAI Mei-rong State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China 
GUO Feng School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China 
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中文摘要:
      目的 探究离子液体(IL)对废旧发动机油摩擦学性能的影响。方法 在四球试验机上,评价了添加剂对摩擦力的影响,随后利用SEM、EDS和粗糙度轮廓仪表征了磨斑形貌、表面化学成分和粗糙度变化;利用点接触光干涉油膜厚度测量装置,研究了添加剂对成膜特性的影响。结果 在40 ℃和100 ℃下,添加离子液体的发动机油摩擦系数相较于废旧油均有所下降,分别在0.095和0.085左右,尤其是在100 ℃下,其摩擦系数(≈0.085)还低于新鲜润滑油(≈0.09)。其次,钢球的磨斑直径也均有所减小。在“轻度”和“严重”乏油的弹流润滑(Starved EHL)条件下,补加离子液体至废旧发动机油中,废旧机油可获得较好的成膜特性,其中心膜厚可增加约20 nm。结论 在边界润滑下加入IL,废旧发动机油重新获得了良好的摩擦磨损性能,高温摩擦过程中,IL在金属表面发生了复杂的化学反应,生成了一层低剪切强度的反应膜。在乏油状态下,油性添加剂IL具有较强的极性,容易在接触表面形成一层稳定的吸附膜,改变接触区润滑油的压力分布,进而引起入口区润滑油的有效黏度远大于其表观黏度,提升了废旧油的成膜能力,从而使其重新获得了较好的润滑性能。
英文摘要:
      This paper aims to explore the influence of ionic liquid on the tribological performance of used engine oil. After the evaluation for the influence of additives on friction by a four-ball experimental machine, the morphology and surface chemical composition of the wear scars are characterized by SEM, EDS and roughness profiler, and the influence of additives on film formation was studied by a measurement device of point contact light interference oil film thickness. After adding the ionic liquid, at 40 ℃ and 100 ℃, the friction coefficients are lower than those of used oil, which are about 0.095 and 0.085 respectively. Especially at 100 ℃, the friction coefficient (≈0.085) is lower than that of fresh lubrication oil (≈0.09) and the diameter of the wear scar is also reduced. Besides, under the conditions of “light” and “severe” starvation of elastohydrodynamic lubrication (Starved EHL), adding IL to the used engine oil can get better film formation and increase about 20 nm center film thickness. After the addition of IL to the lubricated boundary, the used engine oil has regained good friction and wear performance. During the friction process at high temperature, IL undergoes a complex chemical reaction on the metal surface to form a low shear strength reaction film; In the state of starvation, the oil-based additive IL has a strong polarity and it is easy to form a stable adsorption film on the contact surface, which changes the pressure distribution of the lubricating oil on the contact area and causes the effective viscosity of the lubricating oil in the inlet area to be much greater than its the apparent viscosity, so it improves the film-forming ability of used oil, thereby regaining better lubricating performance.
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