Thermo‐oxidative stability of ionic liquids as lubricating fluids

Minami, Ichiro; Kamimura, Hideto; Mori, Shigeyuki

doi:10.1002/jsl.36

Cited by 66 publications

(45 citation statements)

References 27 publications

(37 reference statements)

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“…ILs have a number of properties that make them suitable as prospective lubricants; firstly, their low volatility, low flammability and thermal stability means they are able to safely withstand increased temperatures and pressure involved when there is high friction. In fact, Minami et al have shown a series of imidazolium and ammonium ILs to have a considerably higher stability than a conventional synthetic oil at 200 °C [12].…”

Section: Ionic Liquidsmentioning

confidence: 99%

A Review of Ionic Liquid Lubricants

et al. 2013

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Due to ever increasing demands on lubricants, such as increased service intervals, reduced volumes and reduced emissions, there is a need to develop new lubricants and improved wear additives. Ionic liquids (ILs) are room temperature molten salts that have recently been shown to offer many advantages in this area. The application of ILs as lubricants in a diverse range of systems has found that these materials can show remarkable protection against wear and significantly reduce friction in the neat state. Recently, some researchers have shown that a small family of ILs can also be incorporated into non-polar base oils, replacing traditional anti-wear additives, with excellent performance of the neat IL being maintained. ILs consist of large asymmetrical ions that may readily adsorb onto a metal surface and produce a thin, protective film under boundary lubrication conditions. Under extreme pressure conditions, certain IL compounds can also react to form a protective tribofilm, in particular when fluorine, phosphorus or boron atoms are present in the constituent ions.

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Section: Ionic Liquidsmentioning

confidence: 99%

A Review of Ionic Liquid Lubricants

et al. 2013

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“…It is known in literature that bis(trifl uoromethylsulfonyl)-imide as anion for ionic liquids leads to more thermo-oxidative and physical advantages. 14,15 Many investigations in AC²T research showed also tribological advantages of this anion compared to other anions, e.g. BF 4 and PF 6 .…”

Section: Specimens Selectedmentioning

confidence: 99%

Capacity of selected ionic liquids as alternative EP/AW additive

Schneider

Brenner

Tomastik

et al. 2010

Lubrication Science

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In this paper, it is shown that specifi c ionic liquids have great potential to be used as additives for tribological applications. The results promise a high load carrying capacity; especially for the cation 3-Octhylthiazolium and long term stability up to temperatures of 120°C is given. However, only extreme pressures/ anti-wear properties are examined in detail with the selected test method. Friction modifi er (FM) effectiveness cannot easily be demonstrated, because of the good performance of the selected base stock. Nevertheless, ionic liquids in general did not change the FM characteristic of the base oil in a negative way. A promising potential for ionic liquids to replace a majority of additives in tribological systems is given. Methods used are Schwing-Reib-Verschleiß test according to DIN ASTM D 5706, and Four Ball Tests according to DIN 51360. Mechanisms related to additives in lubricants are investigated by X-ray photoelectron spectroscopy.

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“…Further, hydrophobic anions afford a superior thermo-oxidative stability to RT-ILs as compared to hydrophilic ones [12,14]. The thermo-oxidative stability of RT-ILs decreases with increase in the chain length of the alkyl group in an imidazolium cation [15].…”

Section: Introductionmentioning

confidence: 99%

Tribo-Chemistry of Phosphonium-Derived Ionic Liquids

et al. 2010

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The tribological properties of room temperature ionic liquids containing tetraalkylphosphonium cations were evaluated on the basis of the chemical structure of their salts. The tribochemistry of these ionic liquids was discussed on the basis of the results of tribo-tests and surface analyses. The tribological properties of the tetraalkylphosphonium salts examined in this work were observed to be better than those of 1,3-alkylimidazolium salts. The structure of the alkyl group in the phosphonium cation also has a slight effect on the tribological properties of the salts. During a friction test carried out under lowload conditions, the phosphonium cation was oxidized to phosphate to form a boundary film. This film inhibited the reaction of the bis(trifluoromethanesulfonyl)amide anion that yielded metal fluoride on the rubbed surfaces. The combination of the phosphonium cation with a phosphate anion or thiophosphate anion resulted in a better lubricant than 1,3-alkylimidazolium bis(trifluoromethanesulfonyl)amide. The reactions of the phosphate anion and thiophosphate anion yielded a phosphate boundary film that exhibited better tribological properties than those of the fluoride boundary film.

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Thermo‐oxidative stability of ionic liquids as lubricating fluids

Cited by 66 publications

References 27 publications

A Review of Ionic Liquid Lubricants

A Review of Ionic Liquid Lubricants

Capacity of selected ionic liquids as alternative EP/AW additive

Tribo-Chemistry of Phosphonium-Derived Ionic Liquids

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