Preparation of Well-Dispersed Lubricant Additives with Excellent Antiwear Ability Under High Load
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ORIGINAL PAPER
Preparation of Well‑Dispersed Lubricant Additives with Excellent Antiwear Ability Under High Load Wenjing Li1,2 · Zhigang Yang1,3 · Fei Zha2 · Zhangpeng Li1 · Jinqing Wang1 Received: 26 April 2020 / Accepted: 18 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The reduced graphene oxide (RGO) decorated with rare earth organic complex, Eu(Phen)(OA)3, was successfully synthesized by a simple hydrothermal process. The prepared RGO/Eu(Phen)(OA)3 composites (RGECs) served as lubricating oil additives in Polyalphaolefin-8 (PAO8) and their tribological properties were investigated by SRV-IV fretting friction and wear testing machine. Experimental results indicate that the dispersion stability of RGECs in base oil PAO8 has been optimized greatly compared with that of graphene. The friction coefficient has no obvious change; however, the service life of the base oil, that is effective lubrication time is greatly extended, which is better than the commercial additive Zinc Dialkyldithiophosphate (ZDDP). Furthermore, adding appropriate amount (0.08 wt%) of RGECs is able to reduce the wear spot area by about 56%, the wear rate by about 37% compared with ZDDP. Moreover, these excellent results are attributed to the synergistic effects of RGO nanosheets and Eu(Phen)(OA)3 powders.
* Zhigang Yang [email protected] Zhangpeng Li [email protected] 1
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
2
College of Chemistry & Chemical Engineer, Northwest Normal University, Lanzhou 730070, China
3
School of Manufacturing Science and Engineering, Key Laboratory of Testing Technology for Manufacturing Process, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China
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Graphical Abstract
Keywords Rare earth organic complex · Reduced graphene oxide · 1,10-phenanthroline · Oleic acid · Antiwear
1 Introduction Extensive attentions have been paid close to the reduced graphene oxide (RGO) featuring outstanding physical, chemical and mechanical characteristics benefiting from large
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specific surface area, high coefficient of heat conductivity, high electron transfer mobility as well as strong hardness (Young’s modulus up to 1 TPa) [1–3]. Furthermore, RGO has the characteristics of atomic level thickness and strong hydrophobicity. In addition, the unique layered structure of
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two-dimensional materials makes it own the characteristics of low shear force [4–6]. Therefore, RGO has the potential to become an ideal lubricating material [7–10]. Unfortunately, owing to Van der Waals forces between RGO nanosheets, it is easy to agglomerate when the RGO sheets are used as lubricant additives, especially in base oil, resulting in poor dispersibility of the RGO additives, which severely limits its practical applications. To solve
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