Synergistic low friction effect and mechanism of inorganic fullerene-like tungsten disulfide and talcum at the interface of steel tribo-pairs under severe conditions

Ouyang, Tiancheng; Lei, Wenwu; Tang, Wentao; Cheng, Liang; Shen, Yichen

doi:10.1016/j.apsusc.2022.152570

Cited by 10 publications

(3 citation statements)

References 37 publications

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“…To our pleasant surprise, we found that the friction coefficient gradually increased when the concentration exceeded 0.02 wt %. This increase due to the agglomeration caused by too many nanosheets would definitely cause the friction gap to be blocked, prevent the fluid from entering the friction subsurface, and thus, reduce its thermal conductivity. , To some extent, it might lead to a large contact area between the steel balls, thereby causing lack of oil lubrication and eventually leading to lubrication failure. , The trend of the wear scar diameter of MoS 2 –O-OLA was consistent with the average friction coefficient results and showed the best antiwear effect when the content was 0.02 wt %. It is worth noting that the friction coefficient increased slightly with increasing sliding time when the content of MoS 2 –O-OLA was 0.02 wt %.…”

Section: Resultssupporting

confidence: 69%

“…53,54 To some extent, it might lead to a large contact area between the steel balls, thereby causing lack of oil lubrication and eventually leading to lubrication failure. 55,56 The trend of the wear scar diameter of MoS 2 −O-OLA was consistent with the average friction coefficient results and showed the best antiwear effect when the content was 0.02 wt O nanosheets, which increased the ease of shear between their lamellae, which could better exploit the synergistic contribution between the OLA molecules and MoS 2 . We also observed that both types of alkylamines exhibit unique structural attributes within their alkyl chain segments.…”

Section: ■ Introductionsupporting

confidence: 80%

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Alkylamine-Grafted Molybdenum Disulfide Nanosheets for Enhanced Dispersion Stability and Lubricity Properties

Wang,

Yang,

Bai

et al. 2023

Langmuir

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The unique structure and ultralow interlayer shear strength give molybdenum disulfide (MoS2) materials a broad prospect for energy savings, economic benefits, and extended operating life of lubrication systems. Herein, we prepared an effective integration strategy to prepare novel small-sized and chemically grafted MoS2 to solve the problems of poor dispersibility and easy agglomeration of MoS2. The MoS2 powder was stripped and oxidized to generate active centers using acid oxidation and high-speed ultrasonic crushing to obtain two different types of alkylamine chemically, covalently grafted, oxidized MoS2 nanosheets as lubricant additives to achieve friction reduction and antiwear. The chemical changes and structural characteristics of different types of alkylamine molecules upon covalent interaction with oxidized MoS2 were investigated in detail by FTIR, XPS, TGA, XRD, and TEM analyses. The results showed that the alkylamine-grafted MoS2 oxide nanosheets had good dispersion in 15# industrial white oil, and friction experiments confirmed that the alkylamine-grafted MoS2 oxide (MoS2–O-OLA) nanosheets exhibited better friction and wear resistance such that, compared with pure 15# industrial white oil, the 0.02 wt % MoS2–O-OLA nanosheets could significantly reduce friction (36.2%) and wear (22.4%). The field-emission scanning electron microscopy (FESEM) and EDS analyses of the wear surface showed that MoS2–O-OLA nanosheets play an important role in improving tribological properties by generating interlayer slippage at the steel ball contact interface, thereby forming surface protection and a uniform oil film.

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Section: Resultssupporting

confidence: 69%

Section: ■ Introductionsupporting

confidence: 80%

Alkylamine-Grafted Molybdenum Disulfide Nanosheets for Enhanced Dispersion Stability and Lubricity Properties

Wang,

Yang,

Bai

et al. 2023

Langmuir

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“…The as-obtained onion structure MoS 2 , with a minimal amount of dangling bond, has greatly reduced surface energy as well as excellent antioxidant behavior and extreme pressure properties. Ouyang et al [196] investigated the tribological properties of onion WS 2 and flake talc nanoparticles as lubricant nanoadditives. They found that the onion WS 2 with a high load-carrying capacity as well as mending effect for the friction subsurface reduced the Hertzian contact pressure, while the interlayer sliding of talc nanoparticle helps to further reduce the shear stress via a synergistic effect.…”

Section: Onionmentioning

confidence: 99%

The Current Situation and Future Direction of Nanoparticles Lubricant Additives in China

et al. 2022

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Nanoparticles as lubricant additives demonstrate powerful friction reduction and antiwear properties and are potential alternatives to traditional additives in line with green and environmentally friendly requirements. However, the vast majority of currently available research focuses on the tribological properties of various nanoparticles in base oils at laboratory, which has a large gap with their application in engineering. To cope with the rapid economic and industrial development in China, there is a need to improve the tribological properties of nanoparticles. This paper highlights the current status and development trend of nanoparticles as lubricant additives in China. The factors influencing the tribological properties of nanoparticles, such as their composition, particle size and morphology, as well as the base stocks and their combination with other additives, are summarized. Furthermore, the research progress in the lubrication mechanism of nanoparticles is discussed, and the issues concerning the application of nanoparticles as lubricant additives as well as their future directions are discussed. This review is expected to provide an impetus to guide the design of high-performance, fully formulated lubricant systems containing nanoparticles as the lubricant additive.

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Tribological performance of steel-steel contact tribosurfaces by using nano-enhanced biolubricant

Kumar,

Muniyappa,

Tiwari

et al. 2024

Int J Adv Manuf Technol

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Synergistic low friction effect and mechanism of inorganic fullerene-like tungsten disulfide and talcum at the interface of steel tribo-pairs under severe conditions

Cited by 10 publications

References 37 publications

Alkylamine-Grafted Molybdenum Disulfide Nanosheets for Enhanced Dispersion Stability and Lubricity Properties

Alkylamine-Grafted Molybdenum Disulfide Nanosheets for Enhanced Dispersion Stability and Lubricity Properties

The Current Situation and Future Direction of Nanoparticles Lubricant Additives in China

Tribological performance of steel-steel contact tribosurfaces by using nano-enhanced biolubricant

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