Effect of Graphene Nanoplates Dispersed in Ethanol on Frictional Behaviour of Tool Steel Running Against Uncoated and DLC-Coated Tool Steel

Bhowmick, S.; Yang, Zaixiu; Banerji, A.; Alpas, A.T.

doi:10.1007/s11249-019-1143-1

Cited by 17 publications

(26 citation statements)

References 58 publications

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“…The number of the retained C–C bonds decreases with the sliding time and does not reach a stable state at the end of simulations (see also Figure S2b of the extended simulation at 1 GPa). It can be speculated that the GO flakes will eventually break into fragmented structures and even decompose into amorphous carbon, consistent with the observation of these structures in tribological experiments. ,,,, Figure b shows the variation of the number of interfacial C–Fe bonds during sliding. It seems that there is an interplay between the formation of interfacial C–Fe bonds and the breakage of C–C bonds on the GO flakes.…”

Section: Resultssupporting

confidence: 77%

“…Graphene, due to its unique physical and chemical properties, has been widely tested as a lubricant material for steel/steel sliding contacts in engineering applications. Many studies have found that the graphene, either as a solid lubricant deposited on a friction surface or as an additive in a liquid lubricant, can significantly improve the tribological performance of steel sliding contacts at the macroscale. − For these tribosystems, the fundamental mechanisms for improvement of tribology performances are the structural evolutions of graphene during friction and the formation of a protective film on contact surfaces. − …”

Section: Introductionmentioning

confidence: 99%

“…The inner sublayer close to the steel surface comprised dense iron oxide particles, and the outer sublayer was composed of amorphous carbon with a few embedded graphene-like carbon structures. Bhowmick et al 7 studied a steel/DLC-coated steel tribopair submerged in graphene nanoflake-containing ethanol solution. The tribofilm formed on the steel surface consisted of an iron oxide matrix with deformed and damaged graphene flakes embedded in it.…”

Section: Introductionmentioning

confidence: 99%

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Tribochemistry of Graphene Oxide/Graphene Confined between Iron Oxide Substrates: Implications for Graphene-Based Lubricants

Wang

Duan

2022

ACS Appl. Nano Mater.

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Graphene has been widely tested as a lubricant material for steel sliding contact in engineering applications. The structural and chemical evolutions on friction surfaces are critical to understand the improvement of tribology performance in experiments. Here, we used the reactive molecular dynamics (ReaxFF-MD) simulations to study the friction and wear behaviors of a monolayer graphene oxide or graphene (GO/Gr) flake confined between two amorphous iron oxide substrates. The results show that when under lower loads (<4 GPa), the sliding shear between two substrates is accomplished by folding and unfolding behaviors of the confined GO/Gr flakes. When under relatively higher loads (≥4 GPa), the intensively formed interfacial C–Fe bonds promote the breakage and decomposition of the GO/Gr flakes and also the gradual damaging of the iron oxide surfaces, resulting in partial direct contacts between two substrates. We also found that the presence of functional groups on the GO flakes will affect the formation of interfacial C–Fe bonds, while the detached functional groups could passivate the iron oxide surfaces, thus having a remarkable influence on the tribological properties of steel sliding contacts. These atomistic insights into structural and chemical evolutions during friction can help to promote the usage of GO/Gr flakes as lubricant materials in engineering applications.

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Section: Resultssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tribochemistry of Graphene Oxide/Graphene Confined between Iron Oxide Substrates: Implications for Graphene-Based Lubricants

Wang

Duan

2022

ACS Appl. Nano Mater.

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“…This was also confirmed by presence of the D + D' peak, which is associated with disruptions in the sp 2 hybridization of the carbon bonds [76]. Such an increase in the defect density in the GNPs after wear tests can be expected [77], although previous studies showed that a higher defect density did not hinder the GNPs from imparting lubrication properties [57,78]. As compared to the as-sprayed composite, only a minor change after the wear test is observed for the I 2D /I G ratio, i.e.…”

Section: Post-wear Analysismentioning

confidence: 66%

Incorporation of graphene nano platelets in suspension plasma sprayed alumina coatings for improved tribological properties

Mahade

Mulone

Björklund

et al. 2021

Applied Surface Science

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“…Graphene is an auxiliary substance as a component in organic photovoltaic cells and energy-accumulating materials [1]. It can potentially be used to reduce friction and wear between structural elements [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Effects of a Graphene-Enhanced Lubricant on the Performance of a Tribosystem

Ozimina¹,

Madej²,

Desaniuk³

et al. 2019

dtcse

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The aim of the study was to determine how the presence of graphene in a lubricant (SN-500) affects the behaviour of a tribosystem. The tribological tests were conducted in lubricated, boundary lubricated, and dry sliding friction conditions using a tribometer with the pin and disc made of 100Cr6 steel. The pin and disc wear was monitored using the acoustic emission method. SpectraPLUS was employed to analyse the sampled signals written in the 16-bit linear pulse-code modulation format. Sound level measurements required applying an A-weighting filter and then 1/1 and 1/3 octave filters. The microstructural observations of the pin and disc that followed the tribological tests were performed using a scanning electron microscope. The surface texture of both specimens was measured with an optical profiler. Identification of the elements before and after tribological tests was performed using a scanning electron microscope equipped with an EDS X-ray microanalyser. The experimental data show that the most effective performance of the analysed tribosystem was observed in the presence of the graphene-enhanced lubricant.

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Effect of Graphene Nanoplates Dispersed in Ethanol on Frictional Behaviour of Tool Steel Running Against Uncoated and DLC-Coated Tool Steel

Cited by 17 publications

References 58 publications

Tribochemistry of Graphene Oxide/Graphene Confined between Iron Oxide Substrates: Implications for Graphene-Based Lubricants

Tribochemistry of Graphene Oxide/Graphene Confined between Iron Oxide Substrates: Implications for Graphene-Based Lubricants

Incorporation of graphene nano platelets in suspension plasma sprayed alumina coatings for improved tribological properties

Effects of a Graphene-Enhanced Lubricant on the Performance of a Tribosystem

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