Tribological Behaviour of Plasma-Functionalized Graphene as Low-Viscosity Oil Additive

Bordignon, Ricardo; Salvaro, Diego Berti; Binder, Cristiano; Klein, Aloı́sio Nelmo; Drago, Valderes; Mello, José Daniel Biasoli de

doi:10.1007/s11249-018-1065-3

Cited by 27 publications

(9 citation statements)

References 43 publications

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“…For this reason, both the maximum friction coefficient and the sliding distance to achieve the running-in regime in the DTG nanofluid tests were practically twice the corresponding values observed in the DCG tests. Although this hypothesis needs to be confirmed by further studies, the same effect was found by Bordignon et al [37], studying the influence of plasma functionalization of multilayer graphene (MG) as an additive for low-viscosity polyol ester oil. Pure MG and MG functionalized via N2, and NH3 plasma were analysed.…”

Section: Constant Load Testssupporting

confidence: 53%

Tribological Evaluation of Turbostratic 2D Graphite as Oil Additive

et al. 2021

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In this study, powder technology was used to obtain Fe-SiC composites in which SiC particles act as precursors to generate a large amount of turbostratic graphite dispersed in the composite matrix. The selection of the alloy composition was studied employing Thermo-Calc® software to obtain the temperature and composition range for the stabilization of the graphite phase in iron with a high yield. The extracted turbostratic 2D graphite particles were dispersed in mineral oil in order to evaluate the potential of these particles as a lubricating oil additive. The structure and morphology of the extracted graphite were examined by Raman spectroscopy and transmission electron microscopy (TEM), indicating the highly disordered nature of turbostratic graphite. Reductions in the friction coefficient and wear rate of a tribological pair were observed when compared to the pure mineral oil and mineral oil with commercial graphite particles added. The misorientation and increase in interplanar distances of turbostratic 2D graphite induce a low degree of interaction between these atomic planes, which contributes to the low-friction coefficient and the lower wear rate obtained for this system.

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Section: Constant Load Testssupporting

confidence: 53%

Tribological Evaluation of Turbostratic 2D Graphite as Oil Additive

et al. 2021

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“…Synthetic lubricants which have the ability to maintain their features at high temperatures without decomposing or combusting or experiencing chemical degradation have been developed in recent years in response to the need for high performance lubricants in engineering fields, primarily in space and the automotive industry. 1–6 Polyalphaolefins (PAOs) are among the synthetic lubricants which have gained more attention because of their intrinsic attributes such as wide operating temperature range, thermal stability and better oxidation, low viscosity, biodegradability, lower volatility, and high viscosity indices. PAOs have become new standard as a lubricant; according to the consumer reports, 70 % of the vehicles having either PAO or PAO based blended oils.…”

Section: Introductionmentioning

confidence: 99%

A numerical approach to the modeling of Thompson and Troian slip on magnetized flow of Al₂O₃–PAO nanolubricant over an inclined rotating disk

Muhammad

Khan

2023

Advances in Mechanical Engineering

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In automotive fluids, hydraulic, gear, and bearing oils, as well as in applications operating in extremely high or cold temperatures, PAO is widely employed. In present work, we have made an attempt to develop a mathematical model to discuss the flow of magnetized [Formula: see text] nanolubricant over an inclined rotating disk in Darcy-Forchheimer porous medium with Thompson and Troian slip at the boundary. The effects of mixed convection, nonlinear heat radiation, viscous dissipation, Joule heating, and non-uniform heat source/sink are also included in the modeling. We have solved the proposed model numerically with the help of MATLAB built-in bvp-4c method after metamorphosing the PDEs to ODEs. The enhancing values of inertial parameter and velocity slip parameter decrease the tangential and radial velocities of the nanolubricant. The temperature of the nanolubricant [Formula: see text] enhance significantly by strengthening the magnetic field, whereas radial and tangential velocities get retarded. The non-uniform heat source/sink parameters play a vital role in controlling heat transmission phenomenon. The increasing values of Eckert number, radiation parameter, and non-uniform heat generation parameters tend to increase the value of Nusselt number. The value of Nusselt number drops with rising values of Biot number and non-uniform heat sink parameters.

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“…Under the triple pressure of energy shortage, emission restriction and bad working conditions, the quality requirement of the engine lubricating oil is more stringent, such as lower ash content, lower sulfur phosphorus, lower viscosity, longer oil change period, and so on, especially excellent friction and wear property 1–4 . Low viscosity lubricating oil tends to be used to reduce friction power consumption, 5,6 but its wear property is worthy of attention. With the development of nanotechnology, nanographene has also been studied in the field of engine lubricating oil 7–9 …”

Section: Introductionmentioning

confidence: 99%

Study of dispersion stability and wear property of lubricating oil blends added with nanographene for a diesel engine

Kuang

Yin

Yang

et al. 2022

Lubrication Science

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Good dispersion stability of lubricating oil blends added with graphene is the premise of playing its superior tribology property. In this paper, the dispersion stability of modified graphene in lubricating oil and the wear property of nanolubricating oil on the key friction pair for a diesel engine was studied by simulation and experiment. The results showed that the dispersion of modified graphene in lubricating oil was improved at ambient temperature and pressure and at high temperature and pressure. However, the dispersion effect of graphene at high temperature was slightly worse than that at ambient temperature. The wear property of lubricating oil blends added with modified graphene with a concentration of no more than 100 ppm was improved. With the increase of graphene addition, the wear reduction effect increased first and then decreased. The lubricating oil blend added with 25 ppm modified graphene is the best for wear reduction.

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Tribological Behaviour of Plasma-Functionalized Graphene as Low-Viscosity Oil Additive

Cited by 27 publications

References 43 publications

Tribological Evaluation of Turbostratic 2D Graphite as Oil Additive

Tribological Evaluation of Turbostratic 2D Graphite as Oil Additive

A numerical approach to the modeling of Thompson and Troian slip on magnetized flow of Al₂O₃–PAO nanolubricant over an inclined rotating disk

Study of dispersion stability and wear property of lubricating oil blends added with nanographene for a diesel engine

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Tribological Behaviour of Plasma-Functionalized Graphene as Low-Viscosity Oil Additive

Cited by 27 publications

References 43 publications

Tribological Evaluation of Turbostratic 2D Graphite as Oil Additive

Tribological Evaluation of Turbostratic 2D Graphite as Oil Additive

A numerical approach to the modeling of Thompson and Troian slip on magnetized flow of Al2O3–PAO nanolubricant over an inclined rotating disk

Study of dispersion stability and wear property of lubricating oil blends added with nanographene for a diesel engine

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A numerical approach to the modeling of Thompson and Troian slip on magnetized flow of Al₂O₃–PAO nanolubricant over an inclined rotating disk