Effect of few layer graphene additive on the tribological properties of lithium grease

Li, Zhanjun; He, Qiang; Du, Shigui; Zhang, Yongzhen

doi:10.1002/ls.1506

Cited by 17 publications

(10 citation statements)

References 39 publications

(59 reference statements)

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“…By contrast, grease is more applicable in certain cases owing to its semisolid characteristic, which helps to protect equipment from pollutants and reduce noise. Due to its excellent tolerance of water and anti-rust property, lithium grease is one of the most commonly used greases in the industry [7][8][9]. Lithium grease is composed of colloidal suspensions formed by dispersing thickeners and additives in mineral or synthetic oils.…”

Section: Introductionmentioning

confidence: 99%

Tribological Properties and Lubrication Mechanism of Nickel Nanoparticles as an Additive in Lithium Grease

Wang

Zhang

et al. 2022

Nanomaterials

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Nanomaterials exhibit intriguing tribological performance and have received particular attention in the lubrication field. However, little research has been found that surveyed the application of nanometer Ni in lithium grease. In this study, nanometer Ni with an average size of 100 nm was synthesized by the direct reduction method and dispersed in lithium grease. The feasibility of nanometer Ni as a grease additive in different lubrication scenarios was evaluated by a four-ball friction tester and a TE77 reciprocating friction tester. The lubrication mechanism was analyzed based on the evaluated physical properties of lithium grease and the characterization of the wear surface. The tribology test results showed the tribological properties of lithium grease were enhanced after introducing nanometer Ni. When the dosage was 0.2 wt%, the friction-reducing and anti-wear properties of point-to-point contact increased by 34.8% and 35.2%, respectively, while those of the point-to-flat contact increased by 28.8% and 38.7%, respectively. Our work not only provides theoretical guidance and practical reference for the utilization of nanometer Ni in grease, but also explains several possible lubrication mechanisms of nanomaterials in grease.

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Section: Introductionmentioning

confidence: 99%

Tribological Properties and Lubrication Mechanism of Nickel Nanoparticles as an Additive in Lithium Grease

Wang

Zhang

et al. 2022

Nanomaterials

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“…As for the attapulgite grease with graphene, it possess better tribological properties than the base grease, which can be ascribed to the following two aspects: (1) graphene nanosheets could generate physical deposition tribofilm on the worn surface to reduce friction and wear 16–18 . (2) graphene may be served as catalyser to promote the tribochemical reactions.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, graphene has got great attention in the field of tribology benefiting from its high chemical stability, high load‐bearing capacity and good interlaminar slip property. In particular, there are a lot of reports concerning the study of graphene as lubricating additives for several kinds of greases recently 16–21 . The results indicated that graphene can improve the friction‐reducing and antiwear properties of the greases.…”

Section: Introductionmentioning

confidence: 99%

Improving of the tribological properties of attapulgite base grease with graphene

Feng

Yin²

2021

Lubrication Science

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With the rapid development of industry, individuals paid increasing demanding on the friction‐reducing and antiwear properties of lubricants under harsh service conditions. Here, the attapulgite base grease and attapulgite greases with grephene were successfully synthesised. The tribological behaviours of the greases were comparatively investigated using a SRV‐IV tribometer with the ball‐on‐disk configuration. The results show that the attapulgite grease with graphene presents better friction‐reducing and antiwear properties than the attapulgite base grease, especially at high load, frequency and temperature. The friction‐reducing and antiwear mechanism was determined through the analysis of worn surfaces and tribofilms formed on it. The results revealed that a tribofilm composed with Fe, Fe3C, Fe2O3, FeOOH, Al2O3, SiO2, graphene, attapulgite and organic compounds was formed on the worn surface, which is responsible for the excellent tribological properties of the attapulgite grease with graphene. Thus, as‐prepared attapulgite grease with graphene shows great potential in the lubrication for mechanical equipment operated under harsh conditions.

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“…Moreover corresponding to the grease-B case, the peaks of Fe 3 p3/2 and O1s-C were found at 709.7 and 531.2 eV, respectively. These further indicate the formation of Fe 3 O 4 [37][38][39][40]. The main component found corresponding to grease-A is Fe 2 O 3 ; however, Fe 2 O 3 and The wear scars on the balls and tracks on plates of conventional and textured concentrated contacts have been presented in figures 12 and 13, respectively.…”

Section: Wearmentioning

confidence: 93%

Tribo-behaviours of textured point contacts lubricated with low and high consistency lithium greases under reciprocating motion

Chaudhary

Pandey

Mazumdar

2021

Surf. Topogr.: Metrol. Prop.

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Tribo-behaviours of grease-lubricated textured point contacts were experimentally explored at heavy loads (characterized in term of Hertzian pressure, P H = 1.5–3.0 GPa) and relatively low sliding speeds (0.2 and 0.4 m s−1) under the linear reciprocating motion employing lithium-based low and high consistency greases. Two contacts (grounded plate versus lapped ball & grounded textured plate versus lapped ball) were employed for the comparative investigations of friction coefficient, specific wear rate, and contact potential. Effects of grease consistency on the greases’ rheological behaviours have also been found at two temperatures 25 °C and 80 °C using controlled stress rheometer. Overall, textured concentrated contacts yielded a low coefficient of friction (reduction up to 24.6%), reduced specific wear rate of the ball (decrease up to 89.5%) and better development of contact potential in comparison to conventional contacts. The transmission electron microscopy (TEM) of used greases collected from textured contacts revealed less degradation in soap fibres. Moreover, the x-ray photoelectron spectroscopy (XPS) revealed the formation of ferric oxide (Fe2O3) and ferrous-ferric oxide (Fe3O4) protective chemical films on the worn surfaces of balls of the conventional and textured contacts.

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Effect of few layer graphene additive on the tribological properties of lithium grease

Cited by 17 publications

References 39 publications

Tribological Properties and Lubrication Mechanism of Nickel Nanoparticles as an Additive in Lithium Grease

Tribological Properties and Lubrication Mechanism of Nickel Nanoparticles as an Additive in Lithium Grease

Improving of the tribological properties of attapulgite base grease with graphene

Tribo-behaviours of textured point contacts lubricated with low and high consistency lithium greases under reciprocating motion

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