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Research Article | Open Access

Lubrication of dry sliding metallic contacts by chemically prepared functionalized graphitic nanoparticles

Suprakash SAMANTA1,2, Santosh SINGH1, Rashmi R. SAHOO1,2( )
Surface Engineering & Tribology Division, CSIR - Central Mechanical Engineering Research Institute, Durgapur 713209, India
Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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An erratum to this article is available online at:
https://doi.org/10.1007/s40544-019-0319-x

Abstract

Understanding the mechanism of precision sliding contacts with thin, adherent solid nano lubricating particle films is important to improve friction and wear behavior and ensure mechanical devices have long service lifetimes. Herein, a facile and multistep approach for the preparation of graphene oxide (GO) is presented. Subsequently, surface modification of as-synthesized GO with octadecyl amine (ODA) is performed to prepare hydrophobic GO-ODA and with 6-amino-4-hydroxy-2-naphthalenesulfonic acid (ANS) to prepare amphoteric GO-ANS through a nucleophilic addition reaction. X-ray diffraction and ultraviolet-visible, Fourier transform infrared, and Raman spectroscopy provide significant information about the reduction of oxygen functionalities on GO and the introduction of new functionalities in GO-ODA and GO-ANS. The effects of particle functionalization for the improved control of particle adhesion to the tribocontact have been studied. Wettability and thermal stability were determined using the water contact angle, and atomic force microscopy and differential scanning calorimetry (DSC) were used to characterize particle adhesion to the tribocontact. The tribological performances of the particles have been investigated using macro- and micro-tribometry using pin/ball-on-disc contact geometries. The influence of particle functionalization on the contact pressure and sliding velocity was also studied under rotating and reciprocating tribo-contact in ambient conditions. With an increase in the contact pressure, the functionalized particles are pushed down into the contact, and they adhere to the substrate to form a continuous film that eventually reduces friction. Amphoteric GO-ANS provides the lowest and most steady coefficient of friction (COF) under all tested conditions along with low wear depth and minimal plastic deformation. This is because particles with superior wetting and thermal properties can have better adherence to and stability on the surface. GO-ANS has a superior ability to adhere on the track to form a thicker and more continuous film at the interface, which is investigated by field emission scanning electron microscopy, energy dispersive spectroscopy, and Raman analysis.

Keywords

solid lubricantsnanoparticlescarbongraphitesliding friction and wearadhesionelectron microscopy

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Friction
Volume 8 Issue 4,
August 2020
Pages 708-725
DOI: 10.1007/s40544-019-0295-1
Cite this article:
SAMANTA S, SINGH S, SAHOO RR. Lubrication of dry sliding metallic contacts by chemically prepared functionalized graphitic nanoparticles. Friction, 2020, 8(4): 708-725. https://doi.org/10.1007/s40544-019-0295-1

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Received: 14 August 2018
Revised: 24 November 2018
Accepted: 15 April 2019
Published: 19 July 2019
© The author(s) 2019

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