A Study on the Tribological Performance of Nanolubricants

Jason, Yeoh Jun Jie; How, Heoy Geok; Teoh, Yew Heng; Chuah, Hun Guan

doi:10.3390/pr8111372

Cited by 99 publications

(50 citation statements)

References 124 publications

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“…Graphene has an atomically thin thickness and a layered structure with low shear strength, high mechanical strength, low surface energy, and chemical stability in harsh environments [11], which make graphene widely studied as a lubricant additive [12,13]. Wang et al prepared graphene with 4-6 layers in size of 3-5 µm by liquid phase exfoliation method and then dispersed it into SAE 10W-30 (SAE is the abbreviation of Society of Automotive Engineers.…”

Section: Et Al Added the High Oil Fattymentioning

confidence: 99%

Preparation and Tribological Properties of Graphene Lubricant Additives for Low-Sulfur Fuel by Dielectric Barrier Discharge Plasma-Assisted Ball Milling

Hou

Bhandari³

et al. 2021

Processes

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Poor lubrication performance of low-sulfur fuel leads to increased wear of diesel engine components. In order to improve the lubrication properties of low-sulfur fuel, we successfully prepared graphene lubricant additives by dielectric barrier discharge plasma-assisted ball milling. The tribological properties of graphene lubricant additives in two types of 0# diesel oils with different sulfur content were evaluated by high-frequency reciprocating rig (HFRR). The results indicated that the expanded graphite was exfoliated and refined into graphene sheets with nine layers by the synergistic effect of the heat explosive effect of the discharge plasma, the impact of mechanical milling function, and the cavitation effect of 0# diesel oil. The organic functional groups of 0# diesel oil were successfully grafted on the surface of graphene sheets. The addition of 0.03 wt % graphene resulted in 20% reduction in the friction coefficient (COF) and 28% reduction in wear scar diameter (WSD) compared to pure 0# diesel oil with a sulfur content of 310 mg/kg. The addition of 0.03 wt % graphene resulted in 24% reduction in the friction coefficient (COF) and 30% reduction in wear scar diameter (WSD) compared to pure 0# diesel oil with a sulfur content of 1.1 mg/kg. The formation of graphene tribofilm on rubbing surfaces improved the lubrication properties of low-sulfur fuel.

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Section: Et Al Added the High Oil Fattymentioning

confidence: 99%

Preparation and Tribological Properties of Graphene Lubricant Additives for Low-Sulfur Fuel by Dielectric Barrier Discharge Plasma-Assisted Ball Milling

Hou

Bhandari³

et al. 2021

Processes

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“…The most effective method to improve the tribological performance of grease is to use effective additives (Jin et al , 2020). Nanoparticles have been researched and developed (Wang et al , 2020a, 2020 b) for a long time as a kind of additives with special performance (He et al , 2017; Ren et al , 2020; Jason et al , 2020). Compared with traditional additives, nanoparticles are appealing by virtue of their chemical and thermal stability under tribological conditions (Abd-Elwaheda et al , 2020; Dang et al , 2021).…”

Section: Introductionmentioning

confidence: 99%

Tribological study of TiO2 nanoparticles modified with stearic acid as additives in lithium grease

Zhang

Han

et al. 2021

ILT

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Purpose The purpose of this paper is to improve the properties of metal nanoparticles which are easy to agglomerate and hard to disperse evenly, thus limiting the application of metal nanoparticles in grease. A novel technology was proposed for modifying metal oxide to improve the dispersibility of nanoparticles. Design/methodology/approach SA-TiO2 nanoparticles were synthesized using an in-situ esterification method followed by surface modification with stearic acid. The microstructure of the nanoparticles was characterized by scanning electron microscope, transmission electron microscope and Fourier transform infrared spectroscopy and their thermal stability was evaluated by thermogravimetric analyzer. The tribological properties of the SA-TiO2 nanoparticles as additives in lithium grease were evaluated with a four-ball tester and TE77 reciprocating friction tester. The worn surfaces of the steel balls were investigated by EDS and XPS. Findings The prepared nanoparticles can be well dispersed in the lithium grease and possess much better tribological properties compared to traditional nanoparticles. The results indicated that the excellent tribological performance of SA-TiO2 was attributed to the chemical reaction film composing of Fe2O3, iron oxide and other organic compounds. Originality/value This paper provides a method to prevent the agglomeration of nano-TiO2 by surface modification with stearic acid. And the prepared nanoparticles can effectively improve the tribology performance of lithium grease.

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“…Nanoparticles' action mechanisms in lubricity, which very much depend on their morphology, have resulted in great improvements as far as friction-improving and wear-reducing properties are concerned [2][3][4][5][6]. Particularly, these mechanisms include physical protection by forming tribofilms in contact surfaces, as well as rolling, mending and polishing effects [7][8][9]. Various types of nanoparticles used as lubricant additives to improve friction, wear and extreme pressure properties have been reported.…”

Section: Introductionmentioning

confidence: 99%

Rheological and Tribological Properties of Nanocellulose-Based Ecolubricants

et al. 2021

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Based on the response surface methodology, a rheological and tribological study carried out on eco-friendly lubricants is described. Such ecolubricants consisted of fibrillated or crystalline nanocellulose in vegetable oil (castor oil, high oleic sunflower oil or their mixtures). Cellulose nanoparticles showed noticeable friction-reducing and anti-wear properties within the boundary and mixed lubrication regimes, which were found to be dependent on nanocellulose concentration, base oil composition and applied normal force. In general, both types of nanocellulose performed equally well. An excellent tribological performance, with large wear scar diameter reductions, was achieved with 3.3 wt.% (or higher) nanocellulose dispersions in castor oil-rich mixtures. The observed behavior was explained on the basis of enhanced viscosity of castor oil-rich suspensions and the preferential action of the most polar components, nanocellulose and ricinoleic acid, in the vicinity of the contact surfaces.

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A Study on the Tribological Performance of Nanolubricants

Cited by 99 publications

References 124 publications

Preparation and Tribological Properties of Graphene Lubricant Additives for Low-Sulfur Fuel by Dielectric Barrier Discharge Plasma-Assisted Ball Milling

Preparation and Tribological Properties of Graphene Lubricant Additives for Low-Sulfur Fuel by Dielectric Barrier Discharge Plasma-Assisted Ball Milling

Tribological study of TiO2 nanoparticles modified with stearic acid as additives in lithium grease

Rheological and Tribological Properties of Nanocellulose-Based Ecolubricants

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