The wettability and tribological behaviour of thin F-doped WS2 films deposited by magnetron sputtering
The wettability and tribological behaviour of thin F-doped WS2 films deposited by magnetron sputtering
This work aims to study the influence of the thickness on the wettability behaviour and on the tribological performance of thin WS2–C coatings doped with fluorine (F) deposited by magnetron sputtering. The morphology of the coatings did not change with the thickness decrease, revealing an increase on both the compactness and on the smoothening of the coating surface with F increase. Such an evolution led to more hydrophilic and less oleophilic surface behaviour. XRD results showed that the coatings start growing with an alignment of the (002) planes parallel to the substrate, which changed for randomly oriented crystals with the thickness increase. F insertion induced a decrease in the crystallinity, more evident in the case of thinner coatings. This result was corroborated by Raman analysis which showed a broadening of the main peaks assigned to WS2. Tribological tests carried out at room temperature without lubrication showed lower friction coefficient for F-doped coatings, especially for the thinner one (in the overall test, average 0.03). Regarding the lubricated tests performed with pure PAO (polyalphaoleophin) oil, both thin coatings presented similar friction coefficients (∼0.07) in the steady-state regime. The tribolayer based on oriented W–S layers formed on the wear track for the F-doped coating can justify the very low friction achieved when testing in non-lubricated conditions.
Lubrication, Magnetron sputtering, Raman characterization, Thin WS-CF coatings, Tribology
Rodrigues, S. P.
2eab6df1-1239-43f5-ab50-3b99c654b0c4
Polcar, T.
c669b663-3ba9-4e7b-9f97-8ef5655ac6d2
Carvalho, S.
fbc3e30b-4ce8-49db-9d1d-9fdd04750211
Cavaleiro, A.
114e42eb-7255-47ef-834d-0546d56d3171
25 November 2019
Rodrigues, S. P.
2eab6df1-1239-43f5-ab50-3b99c654b0c4
Polcar, T.
c669b663-3ba9-4e7b-9f97-8ef5655ac6d2
Carvalho, S.
fbc3e30b-4ce8-49db-9d1d-9fdd04750211
Cavaleiro, A.
114e42eb-7255-47ef-834d-0546d56d3171
Rodrigues, S. P., Polcar, T., Carvalho, S. and Cavaleiro, A.
(2019)
The wettability and tribological behaviour of thin F-doped WS2 films deposited by magnetron sputtering.
Surface and Coatings Technology, 378, [125033].
(doi:10.1016/j.surfcoat.2019.125033).
Abstract
This work aims to study the influence of the thickness on the wettability behaviour and on the tribological performance of thin WS2–C coatings doped with fluorine (F) deposited by magnetron sputtering. The morphology of the coatings did not change with the thickness decrease, revealing an increase on both the compactness and on the smoothening of the coating surface with F increase. Such an evolution led to more hydrophilic and less oleophilic surface behaviour. XRD results showed that the coatings start growing with an alignment of the (002) planes parallel to the substrate, which changed for randomly oriented crystals with the thickness increase. F insertion induced a decrease in the crystallinity, more evident in the case of thinner coatings. This result was corroborated by Raman analysis which showed a broadening of the main peaks assigned to WS2. Tribological tests carried out at room temperature without lubrication showed lower friction coefficient for F-doped coatings, especially for the thinner one (in the overall test, average 0.03). Regarding the lubricated tests performed with pure PAO (polyalphaoleophin) oil, both thin coatings presented similar friction coefficients (∼0.07) in the steady-state regime. The tribolayer based on oriented W–S layers formed on the wear track for the F-doped coating can justify the very low friction achieved when testing in non-lubricated conditions.
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Published date: 25 November 2019
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Funding Information:
This research work was supported through the program COMPETE – Programa Operacional Factores de Competitividade – by national funds through FCT – Fundação para a Ciência e a Tecnologia in the framework of the Strategic Funding UID/FIS/04650/2019 , UID/EMS/00285/2019 and with a PhD fellowship PD/BD/112079/2015 . This work was also sponsored by ATRITO -0 [co-financed via FEDER (PT2020) POCI-01-0145-FEDER-030446 and FCT (PIDDAC)] and On-SURF [co-financed via FEDER (PT2020) POCI-01-0247-FEDER-024521 ]. T. Polcar acknowledges the support from the project Novel nanostructures for engineering applications by Czech Science Foundation (Czech Republic) No. CZ.02.1.01/0.0/0.016 026/0008396 .
Funding Information:
This research work was supported through the program COMPETE ? Programa Operacional Factores de Competitividade ? by national funds through FCT ? Funda??o para a Ci?ncia e a Tecnologia in the framework of the Strategic Funding UID/FIS/04650/2019, UID/EMS/00285/2019 and with a PhD fellowship PD/BD/112079/2015. This work was also sponsored by ATRITO-0 [co-financed via FEDER (PT2020) POCI-01-0145-FEDER-030446 and FCT (PIDDAC)] and On-SURF [co-financed via FEDER (PT2020) POCI-01-0247-FEDER-024521]. T. Polcar acknowledges the support from the project Novel nanostructures for engineering applications by Czech Science Foundation (Czech Republic) No. CZ.02.1.01/0.0/0.016 026/0008396.
Publisher Copyright:
© 2019 Elsevier B.V.
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
Keywords:
Lubrication, Magnetron sputtering, Raman characterization, Thin WS-CF coatings, Tribology
Identifiers
Local EPrints ID: 456359
URI: http://eprints.soton.ac.uk/id/eprint/456359
ISSN: 0257-8972
PURE UUID: e2886a2d-eaf3-4b4d-b836-ad14da00ec62
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Date deposited: 27 Apr 2022 06:08
Last modified: 06 Jun 2024 01:49
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Author:
S. P. Rodrigues
Author:
S. Carvalho
Author:
A. Cavaleiro
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