Tungsten dichalcogenide lubricant nanoadditives for demanding applications
Tungsten dichalcogenide lubricant nanoadditives for demanding applications
Tungsten dichalcogenides such as WS2 and WSe2 have remarkable friction reducing properties in tribological applications due to their layered structure which exfoliates easily under shear. 2H-WS2 nanoparticles (NPs) have recently been shown to possess excellent antiwear properties in high temperature applications due to their ability to react with the steel substrate and generate a chemical tribofilm with very good mechanical properties. Moreover, 2H-WS2 sheets can adhere to the chemical tribofilm and thus also reduce boundary friction.
This study investigated the tribological properties of tungsten dichalcogenide NPs with different morphologies (IF and 2H) in high temperature, high pressure test conditions, the aim being to identify their mechanism of action and the differences in their performance. Tribological tests and analysis of tribofilms on the wear tracks revealed that the three additives show a similar mechanism of action based on their chemical reaction with the wear track. However, 2H-WS2 NPs have superior friction reducing and antiwear properties due to their increased reactivity, resulting in a tribofilm that grows faster, thicker, more uniform and richer in tungsten compounds.
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Niste, Vlad
dc4260f3-a934-47e5-b612-da50e0e985da
Ratoi, Monica
cfeffe10-31ca-4630-8399-232c4bc2beff
September 2016
Niste, Vlad
dc4260f3-a934-47e5-b612-da50e0e985da
Ratoi, Monica
cfeffe10-31ca-4630-8399-232c4bc2beff
Niste, Vlad and Ratoi, Monica
(2016)
Tungsten dichalcogenide lubricant nanoadditives for demanding applications.
Materials Today Communications, 8, .
(doi:10.1016/j.mtcomm.2016.04.015).
Abstract
Tungsten dichalcogenides such as WS2 and WSe2 have remarkable friction reducing properties in tribological applications due to their layered structure which exfoliates easily under shear. 2H-WS2 nanoparticles (NPs) have recently been shown to possess excellent antiwear properties in high temperature applications due to their ability to react with the steel substrate and generate a chemical tribofilm with very good mechanical properties. Moreover, 2H-WS2 sheets can adhere to the chemical tribofilm and thus also reduce boundary friction.
This study investigated the tribological properties of tungsten dichalcogenide NPs with different morphologies (IF and 2H) in high temperature, high pressure test conditions, the aim being to identify their mechanism of action and the differences in their performance. Tribological tests and analysis of tribofilms on the wear tracks revealed that the three additives show a similar mechanism of action based on their chemical reaction with the wear track. However, 2H-WS2 NPs have superior friction reducing and antiwear properties due to their increased reactivity, resulting in a tribofilm that grows faster, thicker, more uniform and richer in tungsten compounds.
Text
Revised Manuscript Tungsten dichalcogenide lubricant nanoadditives-Final.docx
- Accepted Manuscript
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["date_types_typename_inpress" not defined] date: 7 April 2016
["date_types_typename_e-pub_ahead_of_print" not defined] date: 9 May 2016
["date_types_typename_published" not defined] date: September 2016
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Local EPrints ID: 392751
URI: http://eprints.soton.ac.uk/id/eprint/392751
ISSN: 2352-4928
PURE UUID: 16db044c-d3b6-4e54-b298-211762313a29
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Date deposited: 18 Apr 2016 08:23
Last modified: 15 Mar 2024 05:29
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Author:
Vlad Niste
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