Synthesis of thermally reduced graphite oxide in sulfuric acid and its application as an efficient lubrication additive

Zhao, Jun; Li, Yingru; Mao, Junyuan; He, Yongyong; Luo, Jianbin

doi:10.1016/j.triboint.2017.06.023

Cited by 63 publications

(19 citation statements)

References 45 publications

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“…As concentration increased, TRGO could aggregate in lubricants and the accompanying clusters may be too large to enter the friction interfaces. In our previous works, the optical concentration of nano-additives was approximately 0.5 wt% [21]. This study confirmed that 0.3 wt% is the optimal concentration for TRGO lubricant for steel/copper friction pairs to realize the lowest COF and slightest wear.…”

Section: Friction and Wearsupporting

confidence: 78%

“…Steel/copper and steel/steel friction pairs lubricated by oil or oil with traditional lubrication additives do not fulfill these requirements. Graphene is a 2D laminated material that has been explored extensively as a novel lubricant additive to further improve the properties of lubrication oil [16][17][18][19][20][21][22][23][24]. It has excellent mechanical and thermal properties as well as good physical and chemical stability [25].…”

Section: Introductionmentioning

confidence: 99%

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An investigation on the tribological behaviors of steel/copper and steel/steel friction pairs via lubrication with a graphene additive

et al. 2020

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In this study, the tribological behaviors of graphene as a lubricant additive for steel/copper and steel/steel friction pairs were compared. For the steel/copper friction pair, the graphene sheets remarkably decreased the coefficient of friction and wear scar depth under low loads, but these slightly increased under high loads. The steel/steel friction pair showed excellent tribological properties even under high loads. Severe plastic deformation on the copper surface reduced the stability of the graphene tribofilm because of a rough copper transfer film on the steel during the running-in period. The results provide a better understanding of the mechanism of graphene as a lubricant additive.

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Section: Friction and Wearsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

An investigation on the tribological behaviors of steel/copper and steel/steel friction pairs via lubrication with a graphene additive

et al. 2020

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“…However, the addition of ODA and ANS chains made a distinct structural change in the graphitic plane. The (002) peak of the GO is shifted to 21° for the GO-ODA with a lower interlayer spacing of 0.41 nm, which is analogous to pristine graphite (interlayer distance 0.34 nm) [50,29]. The (100) peak is observed in the respective position with lower intensity.…”

Section: Resultsmentioning

confidence: 89%

“…The lubricating application of graphene as an additive in oil has been studied over the years and the lubricity of these materials is accounted to the formation of an ordered tribofilm at the contact interface [28,29]. Recently, graphene has attracted significant attention owing to its excellent self-lubricating performances as a solid lubricant [30].…”

Section: Introductionmentioning

confidence: 99%

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

2019

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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.

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“…The G and 2D peaks correspond to the bond stretching of the in-plane vibration of sp 2 atoms and reflect the order of the structure of graphite [31][32][33]. The D peak is attributed to disorder in graphite, and the intensity ratio of ID/IG is a measure of disorder degree in graphite [34][35][36]. As shown in Fig.…”

Section: Friction Mechanismmentioning

confidence: 99%

Influence of a carbon-based tribofilm induced by the friction temperature on the tribological properties of impregnated graphite sliding against a cemented carbide

Zhao

et al. 2020

Friction

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Impregnated graphite has attracted considerable attention and has been widely used as an ideal friction material in many fields. However, the influence of the friction temperature on its tribological properties has not been clearly studied; furthermore, the evolution mechanism of transferred tribofilm is unknown. In this study, the tribological properties of impregnated graphite were investigated at different friction temperatures, and the evolution of the carbon-based tribofilm was also determined. The results revealed that the tribological properties significantly improved with an increase in friction temperature. The friction coefficient and wear depth of impregnated graphite reduced by 68% and 75%, respectively, at a high temperature of 160 °C compared with those of non-impregnated graphite. The significant properties of the impregnated graphite can be attributed to a transferred carbon-based tribofilm with an ordered structure induced by the friction temperature, which uniformly and stably adsorbs on friction interfaces. This study provides an important basis for designing graphite-based friction materials with improved properties suited for industrial applications.

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Synthesis of thermally reduced graphite oxide in sulfuric acid and its application as an efficient lubrication additive

Cited by 63 publications

References 45 publications

An investigation on the tribological behaviors of steel/copper and steel/steel friction pairs via lubrication with a graphene additive

An investigation on the tribological behaviors of steel/copper and steel/steel friction pairs via lubrication with a graphene additive

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

Influence of a carbon-based tribofilm induced by the friction temperature on the tribological properties of impregnated graphite sliding against a cemented carbide

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