Role of base oils in developing extreme pressure lubricants by exploring nano-PTFE particles

Saini, Vinay; Bijwe, Jayashree; Seth, Sarita; Ramakumar, S.S.V.

doi:10.1016/j.triboint.2019.106071

Cited by 42 publications

(24 citation statements)

References 25 publications

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“…Lubrication of surfaces is vital for the tribo-components to reduce friction, energy losses and wear, apart from increasing their efficiency. Novel lubricants and grease are likely to play a substantial role by improving fuel efficiency, reducing emissions and extending the service life of machines [3][4][5][6][7]. Grease is one of the most intriguing forms of the lubricants with distinct advantages such as leak-resistance, non-dripping and sealing property and more importantly the capability to hold both nano-and micro-meter-sized additive particles in suspended form.…”

Section: Introductionmentioning

confidence: 99%

Tribological Investigations of Nano and Micro-sized Graphite Particles as an Additive in Lithium-Based Grease

2020

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Graphite is a well-known solid lubricant (SL) additive widely used both as a standalone SL and also as additive in lubricating oils, greases, composites, etc. Size of the additive particles especially nano-particles (NPs) is a major attribute to the performance properties of a composite, oil, grease, etc. This paper highlights the influence of graphite particles of four sizes viz. 50 nm, 450 nm, 4 microns and 10 microns incorporated in the grease in identical amount (4 wt. %) on the anti-friction (AF), anti-wear (AW) and extreme-pressure (EP) performance. The results indicated that all sizes proved beneficial for all the selected properties. Higher the size of particles, lower was the improvement in performance. The particles were most effective as anti-friction additive (AFA) followed by anti-wear additive (AWA) and then extreme-pressure additive (EPA). The NPs exhibited highest improvement as AFA (57%), AWA (41%) and EPA (25%). Raman Spectroscopy proved the formation of exfoliated graphitic layer on the worn surface of balls. Furthermore, SEM micrograph with elemental mapping and XPS spectroscopy analysis proved supportive in comprehending the mechanisms responsible for improved tribo-performance.

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Section: Introductionmentioning

confidence: 99%

Tribological Investigations of Nano and Micro-sized Graphite Particles as an Additive in Lithium-Based Grease

2020

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“…The EP property, which can prevent the severe failure under heavy loads and impact loads, is also one of significant functions of greases (Saini et al , 2020). ZDDP is reported to be a good extreme pressure additive (Shafi and Charoo, 2020) and when its content is reduced, it leads to a reduction in P B value (Lu et al , 2007).…”

Section: Resultsmentioning

confidence: 99%

Synergistic lubrication effect of antioxidant and low content ZDDP on PFPE grease

Wang

et al. 2021

ILT

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Purpose The purpose of this study is to reduce the use of Zinc dialkyl dithiophosphates (ZDDP) and improve the frictional properties and thermal oxidation stability of Perfluoropolyether (PFPE) grease by adding antioxidant additives. The addition of antioxidants can reduce the consumption of ZDDP as an antioxidant, thus improving the anti-wear efficiency of ZDDP and reducing the excess phosphorus element in the grease. Design/methodology/approach In this study, an antioxidant with good comprehensive performance was selected from several antioxidants by tribological tests and high-temperature tests. Then, the effect of its combination additive with ZDDP on PFPE grease was investigated. The anti-wear property, anti-friction property, thermal oxidation stability and extreme pressure property of greases containing different proportions of ZDDP and antioxidant were tested by four-ball tester and synchronous thermal analyzer (STA). The effects of additives on properties of grease were analyzed by SEM, EDS, LSCM, XPS and FT-IR. Findings The research shows that 2,6-Di-tert-butyl-4-methylphenol (BHT) can be used as an antioxidant in combined additives to reduce the antioxidant reactions of ZDDP, thus improving the anti-wear efficiency of ZDDP and further enhancing the anti-wear performance of the grease. Moreover, BHT and ZDDP have a synergistic effect on the high temperature performance of the PFPE grease due to their different antioxidant mechanisms. Social implications In this paper, the problems related to PFPE grease are studied, which has a certain guiding effect on the industrial application of fluorine grease and the related formulation design. Originality/value In this paper, the properties of PFPE grease under different lubricating condition were studied. The synergistic lubrication effect of antioxidant and ZDDP are discussed. It provides experimental and theoretical support for reducing the content of ZDDP and improving the performance of additives.

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“…Nanomaterials are effective lubricant additives, such as lanthanum borate nanospheres (LBN) [127], core-shell nanocomposites [128], 2D layered -zirconium phosphate (-ZrP) nanosheets intercalated with different amines [129], novel palygorskite nanoplatelets [130], biocarbon-based magnesium silicate hydroxide nanocomposite [131], COOH-functionalized multiwalled carbon nanotubes [132], and nano-PTFE particles [133], etc.…”

Section: Lubricant Additivesmentioning

confidence: 99%

A review of advances in tribology in 2020–2021

Meng

et al. 2022

Friction

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Around 1,000 peer-reviewed papers were selected from 3,450 articles published during 2020–2021, and reviewed as the representative advances in tribology research worldwide. The survey highlights the development in lubrication, wear and surface engineering, biotribology, high temperature tribology, and computational tribology, providing a show window of the achievements of recent fundamental and application researches in the field of tribology.

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Role of base oils in developing extreme pressure lubricants by exploring nano-PTFE particles

Cited by 42 publications

References 25 publications

Tribological Investigations of Nano and Micro-sized Graphite Particles as an Additive in Lithium-Based Grease

Tribological Investigations of Nano and Micro-sized Graphite Particles as an Additive in Lithium-Based Grease

Synergistic lubrication effect of antioxidant and low content ZDDP on PFPE grease

A review of advances in tribology in 2020–2021

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