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Research Article | Open Access

Tribological behaviors of Ni-modified citric acid carbon quantum dot particles as a green additive in polyethylene glycol

Zhiqiang TU1, Enzhu HU1( ), Bangbang WANG2, Karl D DAVID3, Philipp SEEGER4, Martin MONEKE4, Ralph STENGLER4, Kunhong HU1, Xianguo HU2
 Department of Chemical and Materials Engineering, Hefei University, Hefei 230601, China
 School of Mechanical Engineering, Institute of Tribology, Hefei University of Technology, Hefei 230009, China
 Department of Mechanical Engineering, School of Engineering, University of Birmingham, Birmingham B15 2TT, United Kingdom
 Darmstadt Institute of Plastics Engineering, University of Applied Sciences Darmstadt, Darmstadt 64295, Germany
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Abstract

A novel green lubricating oil additive (carbon quantum dot (CQD) particle-doped nickel (Ni-CQD)) was synthesized from citric acid and nickel acetate. The effects of CQD and Ni-CQD nanoparticles on the tribological behaviors of polyethylene glycol (PEG200) were investigated under different loads and reciprocation speeds. The results indicate that CQD and Ni-CQD particles can both enhance the lubrication properties of PEG200. However, the Ni-CQD nanoparticles enhanced the lubrication properties more than the plain CQD particles did. The average friction coefficient and wear rate of PEG200 containing 2 wt% Ni-CQDs were reduced by 35.5% and 36.4%, respectively, compared to PEG200 containing pure CQDs under a load of 8 N and reciprocation speed of 25 mm/s over 60 min. The friction and wear mechanisms are attributed to the fact that friction induces the Ni-CQDs to participate in the formation of a tribofilm, resulting in a low friction coefficient and wear rate.

Keywords

frictiondynamicsjoint clearancenumerical modelsimpactdurability

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Friction
Volume 8 Issue 1,
February 2020
Pages 182-197
DOI: 10.1007/s40544-019-0272-8
Cite this article:
TU Z, HU E, WANG B, et al. Tribological behaviors of Ni-modified citric acid carbon quantum dot particles as a green additive in polyethylene glycol. Friction, 2020, 8(1): 182-197. https://doi.org/10.1007/s40544-019-0272-8

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Received: 03 September 2018
Revised: 27 November 2018
Accepted: 02 January 2019
Published: 27 March 2019
© The author(s) 2019

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