Modified graphene as novel lubricating additive with high dispersion stability in oil

Pu WU; Xinchun CHEN; Chenhui ZHANG; Jiping ZHANG; Jianbin LUO; Jiyang ZHANG

doi:10.1007/s40544-019-0359-2

Friction 2021, 9(1): 143-154 https://doi.org/10.1007/s40544-019-0359-2

Research Article |

Open Access | Issue | Published: 26 March 2020

Modified graphene as novel lubricating additive with high dispersion stability in oil

Show Author's Information Hide Author's Information Pu WU^¹, Xinchun CHEN^¹, Chenhui ZHANG^¹(

), Jiping ZHANG^², Jianbin LUO^¹, Jiyang ZHANG^³(

)

1 State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China

2 Tianjin Research Institute for Advanced Equipment, Tsinghua University, Tianjin 300300, China

3 Beijing Key Laboratory of Long-life Technology of Precise Rotation and Transmission Mechanisms, Beijing Institute of Control Engineering, Beijing 100094, China

Keywords:

modified graphene, dispersity, lubricant additives, tribo-film

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WU P, CHEN X, ZHANG C, et al. Modified graphene as novel lubricating additive with high dispersion stability in oil. Friction, 2021, 9(1): 143-154. https://doi.org/10.1007/s40544-019-0359-2

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Abstract Full text Electronic supplementary material About this article

Abstract

Graphene is a promising material as a lubricant additive for reducing friction and wear. Here, a dispersing method which combines chemical modification of graphene by octadecylamine and dicyclohexylcarbodiimide with a kind of effective dispersant has been successfully developed to achieve the remarkable dispersion stability of graphene in base oil. The stable dispersion time of modified graphene (0.5 wt%) with dispersant (1 wt%) in PAO-6 could be up to about 120 days, which was the longest time reported so far. At the same time, the lubricant exhibits a significant improvement of tribological performance for a steel ball to plate tribo-system with a normal load of 2 N. The coefficient of friction between sliding surfaces was ~0.10 and the depth of wear track on plate was ~21 nm, which decreased by about 44% and 90% when compared to pure PAO-6, respectively. Furthermore, the analysis of the lubricating mechanisms in regard to the sliding-induced formation of nanostructured tribo-film has been contacted by using Raman spectra and TEM.

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About this article

Modified graphene as novel lubricating additive with high dispersion stability in oil

Show Author's information Hide Author's Information Pu WU^¹, Xinchun CHEN^¹, Chenhui ZHANG^¹(

), Jiping ZHANG^², Jianbin LUO^¹, Jiyang ZHANG^³(

)

1 State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China

2 Tianjin Research Institute for Advanced Equipment, Tsinghua University, Tianjin 300300, China

3 Beijing Key Laboratory of Long-life Technology of Precise Rotation and Transmission Mechanisms, Beijing Institute of Control Engineering, Beijing 100094, China

Abstract

Keywords: modified graphene, dispersity, lubricant additives, tribo-film

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Publication history

Received: 15 July 2019

Revised: 15 September 2019

Accepted: 20 September 2019

Published: 26 March 2020

Issue date: February 2021

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Acknowledgements

The work is financially supported by the National Natural Science Foundation of China (Grant Nos. 51527901 and 51335005).

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