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Owing to the significance of improving fuel economy, reducing emissions, and extending the durability of engine components, this study focused on the tribological performance of nano-additives. In this study, copper (Cu) and graphene (Gr) nanomaterials were dispersed in a fully formulated engine oil (5W-30) with different concentrations. The tribological trials were investigated under various speeds and loads, utilizing a reciprocating tribometer to mimic the ring/liner interfaces in the engine. The frictional surface morphologies were comprehensively analyzed using electron probe X-ray microanalysis (EPMA), field emission scanning electron microscopy (FESEM), energy dispersive spectrometer (EDS), and three dimensional (3D) surface profilometry to explore the mechanisms responsible for improving the tribological performance of the frictional sliding parts in the engine. The tribological test results illustrated that lubrication by nano-additives reduced the wear rate (WR) and friction coefficient (COF) by 25%-30% and 26.5%-32.6%, respectively, as compared with 5W-30. The results showed that this is a promising approach for increasing the durability and lifespan of frictional sliding components and fuel economy in automobile engines.


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Anti-wear properties evaluation of frictional sliding interfaces in automobile engines lubricated by copper/graphene nanolubricants

Show Author's information Mohamed Kamal Ahmed ALI1,2,3( )Xianjun HOU1,3( )Mohamed A. A. ABDELKAREEM1,2,3
Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan 430070, China
Automotive and Tractors Engineering Department, Faculty of Engineering, Minia University, El-Minia 61111, Egypt
Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan 430070, China

Abstract

Owing to the significance of improving fuel economy, reducing emissions, and extending the durability of engine components, this study focused on the tribological performance of nano-additives. In this study, copper (Cu) and graphene (Gr) nanomaterials were dispersed in a fully formulated engine oil (5W-30) with different concentrations. The tribological trials were investigated under various speeds and loads, utilizing a reciprocating tribometer to mimic the ring/liner interfaces in the engine. The frictional surface morphologies were comprehensively analyzed using electron probe X-ray microanalysis (EPMA), field emission scanning electron microscopy (FESEM), energy dispersive spectrometer (EDS), and three dimensional (3D) surface profilometry to explore the mechanisms responsible for improving the tribological performance of the frictional sliding parts in the engine. The tribological test results illustrated that lubrication by nano-additives reduced the wear rate (WR) and friction coefficient (COF) by 25%-30% and 26.5%-32.6%, respectively, as compared with 5W-30. The results showed that this is a promising approach for increasing the durability and lifespan of frictional sliding components and fuel economy in automobile engines.

Keywords: friction, wear, tribofilm, engine tribology, nanomaterial, nanolubricant

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Publication history
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Publication history

Received: 11 December 2018
Revised: 16 May 2019
Accepted: 30 May 2019
Published: 28 September 2019
Issue date: October 2020

Copyright

© The author(s) 2019

Acknowledgements

The authors would like to express their deep appreciations for the support by the National Natural Science Foundation of China (No. 51875423) and the support from Hubei Key Laboratory of Advanced Technology for Automotive Components (Wuhan University of Technology). Mohamed Kamal Ahmed ALI acknowledges the financial support from Minia University during his post-doctoral study.

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