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Friction

Article Title

How the fluorographene replaced graphene as nanoadditive for improving tribological performances of GTL-8 based lubricant oil

Authors

Xiaojing CI, Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;School of Materials and Engineering, Shanghai University, Shanghai 200000, China
Wenjie ZHAO, Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Jun LUO, School of Materials and Engineering, Shanghai University, Shanghai 200000, China
Yangmin WU, Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Tianhao GE, Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;School of Materials and Engineering, Shanghai University, Shanghai 200000, China
Qunji XUE, Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Xiulei GAO, Engineering Technology Research Center of Fluorocarbon Materials, Shandong Zhongshan Photoelectric Materials Co., Ltd., Zibo 255138, China
Zhiwen FANG, Engineering Technology Research Center of Fluorocarbon Materials, Shandong Zhongshan Photoelectric Materials Co., Ltd., Zibo 255138, China

Keywords

reduced graphene oxide, fluorographene, lubricating oil, friction, wear, tribofilm

Abstract

Fluorographene, a new alternative to graphene, it not only inherits the 2-dimensional (2D) layered structure and outstanding mechanical properties, but also possesses controllable C-F bonds. It is meaningful to reveal the evolution processes of the tribological behaviors from graphene to fluorographene. In this work, fluorinated reduced graphene oxide nanosheets (F-rGO) with different degree of fluorination were prepared using direct gas-fluorination and they were added into gas to liquid-8 (GTL-8) base oil as lubricant additive to improve the tribological performance. According to the results, the coefficient of friction (COF) reduced by 21%, notably, the wear rate reduced by 87% with the addition of highly fluorinated reduced graphene oxide (HF-rGO) compared with rGO. It was confirmed that more covalent C-F bonds which improved the chemical stability of HF-rGO resisted the detachment of fluorine so the HF-rGO nanosheets showed less damage, as demonstrated via X-ray photoelectron spectroscopy (XPS), Raman spectra, and transmission electron microscopy (TEM). Meanwhile, the ionic liquid (IL) adsorbed on HF-rGO successfully improved the dispersibility of F-rGO in GTL-8 base oil. The investigation of tribofilm by TEM and focused ion beam (FIB) illustrated that IL displayed a synergy to participate in the tribochemical reaction and increased the thickness of tribofilm during the friction process.

Publisher

Tsinghua University Press

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