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Mechanism of action of WS2 nanoadditives in high-pressure contacts

Mechanism of action of WS2 nanoadditives in high-pressure contacts
Mechanism of action of WS2 nanoadditives in high-pressure contacts
Because of their excellent tribological properties and potential to replace problematic lubricant additives currently in use, WS2 nanoparticles have spurred considerable interest over the last two decades from academia and industry to decipher their mechanism of action. To elucidate the mechanism, this study carried out tribological tests at low and high temperatures andinvestigated the wear track and friction properties. It was found that in high-pressure, high-temperature sliding contacts WS2 nanoadditives react with the metal substrate to generate thick chemical tribofilmswhich account for their excellent tribological properties. Based on XPS and FIB/SIMS results, a layered structure was proposed for the chemically formed tribofilms. The large amount of W in the composition of the reacted tribofilm could explain the excellent mechanical and antiwear properties while the exfoliated squashed WS2 NPs which fill the gaps and cover the reacted tribofilm account for the striking reduction of the boundary friction.
1023-8883
81-91
Ratoi, M.
cfeffe10-31ca-4630-8399-232c4bc2beff
Niste, Vlad
dc4260f3-a934-47e5-b612-da50e0e985da
Walker, John C.
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Zekonyte, J.
4a1b52a8-fa37-45d8-88d8-593df2efe662
Ratoi, M.
cfeffe10-31ca-4630-8399-232c4bc2beff
Niste, Vlad
dc4260f3-a934-47e5-b612-da50e0e985da
Walker, John C.
b300eafd-5b0a-4cf5-86d2-735813b04c6f
Zekonyte, J.
4a1b52a8-fa37-45d8-88d8-593df2efe662

Ratoi, M., Niste, Vlad, Walker, John C. and Zekonyte, J. (2013) Mechanism of action of WS2 nanoadditives in high-pressure contacts. Tribology Letters, 52 (1), 81-91. (doi:10.1007/s11249-013-0195-x).

Record type: Article

Abstract

Because of their excellent tribological properties and potential to replace problematic lubricant additives currently in use, WS2 nanoparticles have spurred considerable interest over the last two decades from academia and industry to decipher their mechanism of action. To elucidate the mechanism, this study carried out tribological tests at low and high temperatures andinvestigated the wear track and friction properties. It was found that in high-pressure, high-temperature sliding contacts WS2 nanoadditives react with the metal substrate to generate thick chemical tribofilmswhich account for their excellent tribological properties. Based on XPS and FIB/SIMS results, a layered structure was proposed for the chemically formed tribofilms. The large amount of W in the composition of the reacted tribofilm could explain the excellent mechanical and antiwear properties while the exfoliated squashed WS2 NPs which fill the gaps and cover the reacted tribofilm account for the striking reduction of the boundary friction.

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Published date: 21 August 2013
Organisations: Engineering Science Unit, nCATS Group

Identifiers

Local EPrints ID: 356061
URI: http://eprints.soton.ac.uk/id/eprint/356061
ISSN: 1023-8883
PURE UUID: 8b4380d0-6a9b-4cd6-b972-92c1a24d0bba

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Date deposited: 04 Sep 2013 13:42
Last modified: 02 Dec 2019 20:48

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Contributors

Author: M. Ratoi
Author: Vlad Niste
Author: John C. Walker
Author: J. Zekonyte

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