Friction Characteristics of Transition-Metal Disulfides and Diselenides

Jamison, Warren E.; Cosgrove, Stanley L.

doi:10.1080/05698197108983228

Cited by 60 publications

(31 citation statements)

References 9 publications

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“…The low-friction properties of WS 2 and other TMDs are an effect of the weak bonding between the layers, which are only van der Waals interactions [68,69]. Theoretically, TMD layers can slide against each other almost without friction [70].…”

Section: Resultsmentioning

confidence: 97%

Amorphous W–S–N thin films: The atomic structure behind ultra-low friction

et al. 2015

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Amorphous W-S-N in the form of thin films has been identified experimentally as an ultra-low friction material, enabling easy sliding by the formation of a WS 2 tribofilm. However, the atomic-level structure and bonding arrangements in amorphous W-S-N, which give such optimum conditions for WS 2 formation and ultra-low friction, are not known. In this study, amorphous thin films with up to 37 at.% N are deposited, and experimental as well as state-of-the-art ab initio techniques are employed to reveal the complex structure of W-S-N at the atomic level. Excellent agreement between experimental and calculated coordination numbers and bond distances is demonstrated. Furthermore, the simulated structures are found to contain N bonded in molecular form, i.e. N 2 , which is experimentally confirmed by near edge X-ray absorption fine structure and X-ray photoelectron spectroscopy analysis. Such N 2 units are located in cages in the material, where they are coordinated mainly by S atoms. Thus this ultra-low friction material is shown to be a complex amorphous network of W, S and N atoms, with easy access to W and S for continuous formation of WS 2 in the contact region, and with the possibility of swift removal of excess nitrogen present as N 2 molecules.

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Section: Resultsmentioning

confidence: 97%

Amorphous W–S–N thin films: The atomic structure behind ultra-low friction

et al. 2015

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“…Transition metal dichalcogenides (TMD-sulfides, selenides or tellurides of tungsten, molybdenum and niobium) are wellknown for their lubricating property [1]. MoS 2 is the most popular member of the above-mentioned family and it is widely used as a solid lubricant in vacuum and inert atmospheres.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and structural properties of Mo–Se–C sputtered coatings

Polcar

Evaristo

Stueber

et al. 2008

Surface and Coatings Technology

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“…In recent years, MoS 2 has been the subject of much interest as a lubricant for rotating and sliding components [4].…”

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confidence: 99%

Thermal analysis and kinetics of oxidation of molybdenum sulfides

Shigegaki

Basu

Wakihara

et al. 1988

Journal of Thermal Analysis

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The thermal oxidation process of stoichiometric MoS 2 and nonstoichiometric "M02S3", together with the kinetics of oxidation of MoS2, were studied by using TG and DTA techniques in the Po 2 range 1~).0890 atm. MoS 2 was oxidized completely to MoO3 in one step:MoS 2 + 7/20 2 -,MOO 3 + 2 SO 2Irrespective of Po2 and the heating rate, "M02S3" was oxidized finally to MOO3, via the following four steps:where (sur) refers to the surface layer. The kinetic study revealed that the oxidation (x = 0.01~).90) of MoS 2 to MoO 3 was controlled by the kinetics l-(1-ct) t/a = kt and that the apparent activation energies determined with the isothermal and the nonisotbermal (10degmin-0 method were 98.1+2.2 and 93.5+3.0kJmol -~, respectively, over the temperature range 540-625 ~ and the Po 2 range 0.6124).129 atm. The relationship between the rate constant k and Po E was determined.In the Mo-S system, the hexagonal 2H-MoS2, the monoclinic "Mo2S3" and metallic Mo can be obtained in solid-gas equilibrium reactions at temperatures higher than 610 ~ [1-3]. In recent years, MoS 2 has been the subject of much interest as a lubricant for rotating and sliding components [4].The oxidation and the kinetics of oxidation of MoS 2 are generally studied from the point of view of recovering molybdenum from molybdenite concentrate (ca. 90% MoS2). Ong [5] reported an investigation on the oxidation of molybdenite compressed into pellets over the temperature range 360--461~ He suggested that the John Wiley & Sons, Limited, Chichester Akad~miai Kiad6, Budapest

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Friction Characteristics of Transition-Metal Disulfides and Diselenides

Cited by 60 publications

References 9 publications

Amorphous W–S–N thin films: The atomic structure behind ultra-low friction

Amorphous W–S–N thin films: The atomic structure behind ultra-low friction

Synthesis and structural properties of Mo–Se–C sputtered coatings

Thermal analysis and kinetics of oxidation of molybdenum sulfides

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