Lubrication performance of graphene-containing oil on steel and DLC-coated surfaces

Kogovšek, J.; Kalin, Mitjan

doi:10.1016/j.triboint.2019.05.026

Cited by 47 publications

(29 citation statements)

References 69 publications

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“…There has been a huge global interest in and study of graphene properties; however, it is surprising that there are very few studies on macro- scale tribology dealing with graphene as an additive to lubricants [80] to [83]. Our resent work has shown the great potential of graphene as a green oil additive, having much better tribological performance than conventional graphite or CNT [84]. This is another novel result from a series of nanoparticle studies that we made in the past decade, to look at the potential of graphene as an oil additive.…”

Section: Fig 17 Wear Loss Of Steel Balls In a Contact Lubricated Wimentioning

confidence: 99%

Green Tribology for the Sustainable Engineering of the Future

Kalin

Kus

Majdič

2019

SV-JME

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Environmental awareness and especially the legislation that requires the reduction of polluting emissions are strong driving forces toward more sustainable engineering and greener solutions in the design, use and overall life span of machinery. However, providing novel concepts that will exclude non-environmentally adapted, but over many years developed and optimized solutions, is not an easy task. It clearly requires time if the same level of technical performance is to be maintained. Green tribology is one of the fields that has been closely involved in these actives in the past two decades. The research and use of tribology science and technology toward green and sustainable engineering include natural material usage, lower energy consumption, reducing natural oil resources, reducing pollution and emissions, fewer maintenance requirements and thus reduced machinery-investment cycles. This report is not an attempt to cover all the existing concepts, attempts or literature available in the field, but mainly those efforts that our group has been working on over the past 20 years, which mainly includes novel green-lubrication concepts that come from exploring and exploiting surface engineering through the use of diamond-like-carbon (DLC) coatings.

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Section: Fig 17 Wear Loss Of Steel Balls In a Contact Lubricated Wimentioning

confidence: 99%

Green Tribology for the Sustainable Engineering of the Future

Kalin

Kus

Majdič

2019

SV-JME

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“…Compared with disulfide materials (MoS2 and WS 2 ), carbon materials have attracted increasing attention owing to their environmental friendliness and interfacial non-corrosion [17,18]. Graphene is widely used to improve the tribological properties of lubricants owing to its excellent self-lubricating properties induced by its unique two dimensional (2D) structure [19][20][21][22][23][24][25]. Graphene improves the tribological performance of oils by forming a lubricating adsorption film and through the graphene interlayer slippage effect.…”

Section: Introductionmentioning

confidence: 99%

Improvement of the lubrication properties of grease with Mn3O4/graphene (Mn3O4#G) nanocomposite additive

et al. 2020

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Although grease can effectively lubricate machines, lubrication failure may occur under high speed and heavy load conditions. In this study, Mn3O4/graphene nanocomposites (Mn3O4#G) were synthetized using a hydrothermal method as lubricant additives. The lubrication properties of compound grease with Mn3O4#G nanocomposite additive under heavy contact loads of 600–900 N (3.95–4.59 GPa) were investigated. First, the nanocomposites were dispersed into L-XBCEA 0 lithium grease via successive electromagnetic stirring, ultrasound vibration, and three-roll milling. Compound grease with additives of commercial graphene (Com#G) was also investigated for comparison. Tribological test results revealed that the trace amounts of Mn3O4#G (as low as 0.02 wt%) could reduce the coefficient of friction (COF) of grease significantly. When the concentration of Mn3O4#G was 0.1 wt%, the COF and wear depth were 43.5% and 86.1%, lower than those of pure graphene, respectively. In addition, under the effect of friction, the microstructure of graphene in Mn3O4#G nanocomposites tends to be ordered and normalized. Furthermore, most of the Mn3O4 transformed into Mn2O3 owing to the high temperature generated from friction. Using the Ar gas cluster ion beam sputtering method, the thickness of the tribofilm was estimated to be 25–34 nm. Finally, the improvement of the lubrication properties was attributed to the synergistic effect of the adsorbed tribofilm, i.e., the graphene island effect and the filling effect of Mn3O4#G.

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“…Applying lubricant additives has been widely considered as a convenient way to enhance tribological performances for the lubricating system. Currently, two‐dimensional (2D) materials such as graphene, black phosphorus, MoS 2 , and their derivatives have been demonstrated to be potential lubricant additives due to their attractive layered structure 1‐5 . Particularly, hexagonal boron nitride (h‐BN), a typical layered 2D material, has unique structure in which van der Waals forces exist between two covalently bonded sheets.…”

Section: Introductionmentioning

confidence: 99%

“…Adding lubricant additives of nanoparticles in the base oil is an effective technique for achieving improved tribological properties for machinery component. It is an more effective strategy by constructing a lubrication system using suitable lubricants and hard coatings as friction interfaces to reduce friction and wear 1‐3,19‐22 . For instance, Liu et al 2 achieved extreme wear resistance and friction reduction in a solid‐liquid composite lubrication system constituted with g‐C 3 N 4 nanosheets as the lubricating oil additives and Ti‐DLC film as the rubbing surface.…”

Section: Introductionmentioning

confidence: 99%

Functionalised h‐BN as an effective lubricant additive in PAO oil for MoN coating sliding against Si₃N₄ ball

Liu

Tang

et al. 2020

Lubrication Science

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Hexagonal boron nitride (h‐BN) exhibits great potential for tribological applications due to its attractive 2D layered structure. In this work, functionalised hexagonal boron nitride (f‐BN) was prepared by ultrasonic exfoliation of pristine h‐BN in water and subsequent hydrothermal modification with sodium oleat. Fourier infrared spectra and X‐ray photoelectron spectra analyses showed that long alkyl‐chains were successfully grafted on the surface of f‐BN by modification process. The tribological properties of the as‐prepared f‐BN as lubricant additive in poly‐alpha‐olefin 10 (PAO10) for lubricating MoN coating sliding against Si3N4 ball were evaluated by a ball‐on‐disc friction tester. The friction coefficient and wear rate of the oil dispersed with 2 mg/mL f‐BN was respectively reduced by 42% and 29% in comparison with the pure PAO10 oil, suggesting that f‐BN was an effective lubricating additive for reducing friction and wear. Finally, the lubricating mechanism of f‐BN dispersed in PAO10 was discussed and proposed.

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Lubrication performance of graphene-containing oil on steel and DLC-coated surfaces

Cited by 47 publications

References 69 publications

Green Tribology for the Sustainable Engineering of the Future

Green Tribology for the Sustainable Engineering of the Future

Improvement of the lubrication properties of grease with Mn3O4/graphene (Mn3O4#G) nanocomposite additive

Functionalised h‐BN as an effective lubricant additive in PAO oil for MoN coating sliding against Si₃N₄ ball

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Lubrication performance of graphene-containing oil on steel and DLC-coated surfaces

Cited by 47 publications

References 69 publications

Green Tribology for the Sustainable Engineering of the Future

Green Tribology for the Sustainable Engineering of the Future

Improvement of the lubrication properties of grease with Mn3O4/graphene (Mn3O4#G) nanocomposite additive

Functionalised h‐BN as an effective lubricant additive in PAO oil for MoN coating sliding against Si3N4 ball

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Functionalised h‐BN as an effective lubricant additive in PAO oil for MoN coating sliding against Si₃N₄ ball