Tribological Characterisation of Graphene Oxide as Lubricant Additive on Hypereutectic Al-25Si/Steel Tribopair.

Kumar, P. and Wani, M. F., 2017. Tribological Characterisation of Graphene Oxide as Lubricant Additive on Hypereutectic Al-25Si/Steel Tribopair. Tribology Transactions, 1 - 12. (In Press)

Full text available as:

[img] PDF
TT online pAPER.pdf - Accepted Version
Restricted to Repository staff only until 28 April 2018.
Available under License Creative Commons Attribution Non-commercial No Derivatives.

2MB

DOI: 10.1080/10402004.2017.1322735

Abstract

The performance of a lubricant greatly depends on the additives it involves. However, recently used additives produce severe pollution when they are burned and exhausted. Therefore, it is necessary to develop a new generation of green additives. Graphene oxide (GO) is considered to be environmentally friendly. The scope of this study is to explore the fundamental tribological behavior of graphene, the first existing 2D material, and evaluate its performance as a lubricant additive. The friction and wear behavior of 0.5 wt% concentrations of GO particles in ethanol and SAE20W50 engine oil on a hypereutectic Al-25Si alloy disc against steel ball was studied at 5 N load. GO as an additive reduced the wear coefficient by 60–80% with 30 Hz frequency for 120 m sliding distance. The minimum value of the coefficient of friction (0.057) was found with SAE20W50 + 0.5 wt% GO. A possible explanation for these results is that the graphene layers act as a 2D nanomaterial and form a conformal protective film on the sliding contact interfaces and easily shear off due to weak Van der Waal's forces and drastically reduce the wear. Scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and Raman spectroscopy were used for characterization of GO and wear scars.

Item Type:Article
ISSN:1040-2004
Uncontrolled Keywords:Synthesis; graphene oxide;tribology; friction; wear and lubrication
Group:Faculty of Science & Technology
ID Code:29455
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:12 Sep 2017 13:47
Last Modified:12 Dec 2017 16:12

Downloads

Downloads per month over past year

More statistics for this item...
Repository Staff Only -