Enhancing the thermophysical and tribological performance of gear oil using Ni-promoted ultrathin MoS 2 nanocomposites

Rajendhran, Naveenkumar; Palanisamy, Siva; Shyma, Arunkumar Prabhakaran; Rajendran, V.

doi:10.1016/j.triboint.2018.03.030

Cited by 33 publications

(8 citation statements)

References 23 publications

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“…The viscosity index is a measure of change of kinematic viscosity over range of temperature. Higher viscosity index is desirable for lubricant performance as that will enhance tribo-film formation for efficient boundary lubrication under a wide range of temperatures (Rajendhran et al , 2018). The viscosity index of the enhanced biolubricant was observed to be augmented by 7.39% with maghemite (MGCO) and 13.85% with graphene (XGCO) nano-additives as shown in Table 4.…”

Section: Resultsmentioning

confidence: 99%

“…The smoothness of the surface is further collaborated by the AFM result as shown in Figure 10, labelled XGCO with height of ridges 30 μm on the worn surface. This could be attributed to the protective tribo-film mechanism through the formation of sufficient lubricating film between contacting surfaces to reduce or cause physical separation between asperities, significantly reducing friction and wear (Rajendhran et al , 2018). The surface lubricated by biolubricant without nano-additive produces the highest Ra value of 0.18 μm.…”

Section: Resultsmentioning

confidence: 99%

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Enhanced performance of bio-lubricant properties with nano-additives for sustainable lubrication

Sadiq

Suhaimi

Safian

et al. 2022

ILT

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Purpose The purpose of this study is to evaluate the potentials of nano-additives in enhancement of oxidation and thermal stability of biolubricants thereby, improving the resistance of dispersed nanolubricants to thermal degradation under elevated temperature. Design/methodology/approach This study evaluates the oxidation stability and tribological performance of nano-enhanced biolubricants. Graphene and maghemite nanoparticles at 0.1% volume concentration were dispersed into coconut oil. Oxidation stability was analysed using a thermal analyser to understand the effect of nano-additives on thermal degradation of lubricants under increasing temperature. In addition, tribological performance and viscosity of the tested lubricants were evaluated using a four-ball friction tester and viscometer according to American Society for Testing and Materials standards. Findings The results reveal that the oxidation stability of biolubricants dispersed with nano-additives improves due to delayed thermal degradation. The nano-enhanced biolubricants’ oxidation onset temperature was delayed by 18.75 °C and 37.5 °C, respectively, for maghemite (MGCO) and graphene (XGCO) nanolubricants. This improvement imparts the performance viscosity and tribological performance positively. For graphene-enhanced nanolubricant, 10.4% and 5.6% were reduced, respectively, in coefficient of friction (COF)and wear scar diameter (WSD), whereas 3.43% and 4.3% reduction in COF and WSD, respectively, for maghemite-enhanced nanolubricant compared with coconut oil. The viscosity index of nanolubricants was augmented by 7.36% and 13.85%, respectively, for maghemite and graphene nanolubricants. Research limitations/implications The excellent performance of nanolubricants makes them suitable candidate as sustainable lubricants for machining with regard to environmental benefits and energy saving. Originality/value The effect of graphene and maghemite nanoparticles on the oxidation stability and tribological performance of biolubricants has been investigated. It is an original work and yet to be published elsewhere.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Enhanced performance of bio-lubricant properties with nano-additives for sustainable lubrication

Sadiq

Suhaimi

Safian

et al. 2022

ILT

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“…Convective heat exchange occurs between lubricating oil, surrounding air, and solid gears. Considerable amounts of frictional heat are transferred by lubricating oil to push the gear to achieve a heat balance with the surroundings in the event of an excessive temperature, and thus heat convection of the meshing area is also closely related to lubricating oil [16][17][18]. Previous thermal elastohydrodynamic lubrication studies were limited to the distribution of temperature gradients in local contact areas.…”

Section: Introductionmentioning

confidence: 99%

Influence of Nozzle Layouts on the Heat-Flow Coupled Characteristics for Oil-Jet Lubricated Spur Gears

Yang

Zhong

et al. 2023

Lubricants

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Aiming to explore the influence of nozzle layouts on the lubrication and cooling performance of spur gears under oil jet lubrication conditions, this paper introduces a heat-flow coupled analysis method to predict the temperature field of the tooth surface with different nozzle layouts. Firstly, the friction heat formulas integrating the coefficient of friction and average contact stress are presented for calculating heat generation. We also present the impingement depth model, which considers the nozzle orientation parameters, jet velocity, and gear structure of the given spur gear pair for laying out the nozzle. Then, a heat-flow coupled finite element analysis method is exploited to resemble the jet lubrication process and gain the gear temperature characteristics. Finally, the numerical results of this model compare well with those of the experiments, showing that this heat-flow coupled model provides accurate temperature prediction, indicating that the nozzle layouts determined as a function of the oil jet height, deviation distance, and oil injection angle significantly influence the lubrication and cooling performance. Further, this study also reveals that the lubrication performance in cases where the nozzle approaches the side of the pinion is relatively superior.

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“…3−6 These materials remarkably affect friction and wear properties. 7,8 Two-dimensional MoS 2 nanosheet has the characteristics of a two-dimensional layered material and strong adsorption properties between the sulfur element exposed on the surface of MoS 2 and the metal surface. Thus, a tribochemical reaction film can be easily formed on the friction surface, 9 which is ideal for high-performance lubricant additives.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In recent years, two-dimensional layered materials with ultrathin structures have shown good application prospects in lubrication, optics, electrochemistry, and catalysis due to their unique structures and excellent properties. , Many studies have shown that two-dimensional layered materials have an extremely high-load-bearing capacity and can easily enter the friction contact area due to their ultrathin thickness. − These materials remarkably affect friction and wear properties. , Two-dimensional MoS 2 nanosheet has the characteristics of a two-dimensional layered material and strong adsorption properties between the sulfur element exposed on the surface of MoS 2 and the metal surface. Thus, a tribochemical reaction film can be easily formed on the friction surface, which is ideal for high-performance lubricant additives.…”

Section: Introductionmentioning

confidence: 99%

Study on the Sliding Tribological Behavior of Oleic Acid-Modified MoS₂ under Boundary Lubrication

Guo,

Pan,

2023

Langmuir

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The effects of MoS2 and MoS2 modified by adding oleic acid (OA) on the friction properties of lithium-based grease under boundary lubrication conditions are studied by molecular dynamics (MD) simulation and experiment. A rough wall boundary lubrication MD model with peaks and grooves is established to simulate the mechanical properties and lubrication effects of three lubrication systems on rough walls for the relative shear velocity between the two solid walls of 5 m/s at 500 MPa. The stress, wear amount, friction force, normal pressure, and friction heat of the friction surface are quantitively calculated. Simultaneously, a Retc friction and wear testing machine is used to measure the friction coefficient under different concentrations of additives and different pressures. The results show that the grease added with MoS2 can reduce friction, wear, and the temperature between friction pairs. However, under high pressure and shear, MoS2 can easily agglomerate and accumulate in the pits, reducing the lubricating effect. At the same time, since OA-modified MoS2 can reduce agglomeration, the modified MoS2 is adsorbed on the metal wall surface, forming a stable lubricant film. The main contributions of this article can be found in combining MD simulation and experimentation, establishing the connection between micronano structures and macroscopic properties, exploring the mechanism of the influence of wall roughness and particle size on the friction performance of lubricating oil, and providing a theory for predicting and developing high-performance new lubricating grease.

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Enhancing the thermophysical and tribological performance of gear oil using Ni-promoted ultrathin MoS 2 nanocomposites

Cited by 33 publications

References 23 publications

Enhanced performance of bio-lubricant properties with nano-additives for sustainable lubrication

Enhanced performance of bio-lubricant properties with nano-additives for sustainable lubrication

Influence of Nozzle Layouts on the Heat-Flow Coupled Characteristics for Oil-Jet Lubricated Spur Gears

Study on the Sliding Tribological Behavior of Oleic Acid-Modified MoS₂ under Boundary Lubrication

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Enhancing the thermophysical and tribological performance of gear oil using Ni-promoted ultrathin MoS 2 nanocomposites

Cited by 33 publications

References 23 publications

Enhanced performance of bio-lubricant properties with nano-additives for sustainable lubrication

Enhanced performance of bio-lubricant properties with nano-additives for sustainable lubrication

Influence of Nozzle Layouts on the Heat-Flow Coupled Characteristics for Oil-Jet Lubricated Spur Gears

Study on the Sliding Tribological Behavior of Oleic Acid-Modified MoS2 under Boundary Lubrication

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Study on the Sliding Tribological Behavior of Oleic Acid-Modified MoS₂ under Boundary Lubrication