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Structure, mechanical and tribological properties of MoSe2 and Mo-Se-N solid lubricant coatings

Structure, mechanical and tribological properties of MoSe2 and Mo-Se-N solid lubricant coatings
Structure, mechanical and tribological properties of MoSe2 and Mo-Se-N solid lubricant coatings

Mo-Se-N films were prepared by pulsed direct current (DC) High Target Utilisation Sputtering (HiTUS) in reactive Ar + N2 atmosphere. Here, the effect of nitrogen doping was studied. MoSex film with Se/Mo atomic ratio ~ 2 exhibited polycrystalline structure and the lowest coefficients of friction (COFs) in humid air from 0.025 to 0.1 for loads in the range 2–45 N. Mo-Se-N coatings were deposited with N concentrations ranging from 1 to 40 at.%, whereas Se/Mo ratio varied from 0.6 to 2. Mo-Se-N coatings formed amorphous structures for the N contents above 7 at.% and increased hardness proportional with the N content up to 9 GPa. The addition of nitrogen also resulted in a general decrease in wear rate of two orders of magnitude when compared to pristine films while retaining a reasonably low coefficient of friction. Mo-Se-N films showed notable COF values in humid environment ranging from 0.22 to 0.015 when tested using loads from 2 to 45 N. The excellent friction properties of Mo-Se-N films were associated to the crystallisation of a MoSe2 tribofilm in the wear scar. Moreover, we showed that modern pulsed DC HiTUS technology represents a suitable way of producing thin films with a variety of elemental compositions and desired mechanical and tribological properties, even from sensitive, semi-conducting and extremely low thermally conductive MoSe2 targets.

Hardness enhancement, Low friction, Mo-Se-N, MoSe, Solid lubricant, Sputtering
0257-8972
Hudec, Tomáš
33736329-4364-4602-8842-dbeaa8377318
Izai, Vitalii
bd580259-e011-47db-92fc-1d825cb25870
Satrapinskyy, Leonid
7fc0c78a-fabd-49a4-823f-b2ac6291c2c6
Huminiuc, Teodor
b743b7ba-7541-4f2e-b4be-ea25b088e4c6
Roch, Tomáš
0369cab3-ea48-4dae-916c-4e2fb2a01e68
Gregor, Maroš
91547efa-7bc1-4f8a-adda-98a86e993375
Grančič, Branislav
d819e069-48d4-4b19-afa6-d014ef596547
Mikula, Marián
47820357-652d-493a-9a13-10046f75a1f9
Polcar, Tomáš
c669b663-3ba9-4e7b-9f97-8ef5655ac6d2
Hudec, Tomáš
33736329-4364-4602-8842-dbeaa8377318
Izai, Vitalii
bd580259-e011-47db-92fc-1d825cb25870
Satrapinskyy, Leonid
7fc0c78a-fabd-49a4-823f-b2ac6291c2c6
Huminiuc, Teodor
b743b7ba-7541-4f2e-b4be-ea25b088e4c6
Roch, Tomáš
0369cab3-ea48-4dae-916c-4e2fb2a01e68
Gregor, Maroš
91547efa-7bc1-4f8a-adda-98a86e993375
Grančič, Branislav
d819e069-48d4-4b19-afa6-d014ef596547
Mikula, Marián
47820357-652d-493a-9a13-10046f75a1f9
Polcar, Tomáš
c669b663-3ba9-4e7b-9f97-8ef5655ac6d2

Hudec, Tomáš, Izai, Vitalii, Satrapinskyy, Leonid, Huminiuc, Teodor, Roch, Tomáš, Gregor, Maroš, Grančič, Branislav, Mikula, Marián and Polcar, Tomáš (2021) Structure, mechanical and tribological properties of MoSe2 and Mo-Se-N solid lubricant coatings. Surface and Coatings Technology, 405, [126536]. (doi:10.1016/j.surfcoat.2020.126536).

Record type: Article

Abstract

Mo-Se-N films were prepared by pulsed direct current (DC) High Target Utilisation Sputtering (HiTUS) in reactive Ar + N2 atmosphere. Here, the effect of nitrogen doping was studied. MoSex film with Se/Mo atomic ratio ~ 2 exhibited polycrystalline structure and the lowest coefficients of friction (COFs) in humid air from 0.025 to 0.1 for loads in the range 2–45 N. Mo-Se-N coatings were deposited with N concentrations ranging from 1 to 40 at.%, whereas Se/Mo ratio varied from 0.6 to 2. Mo-Se-N coatings formed amorphous structures for the N contents above 7 at.% and increased hardness proportional with the N content up to 9 GPa. The addition of nitrogen also resulted in a general decrease in wear rate of two orders of magnitude when compared to pristine films while retaining a reasonably low coefficient of friction. Mo-Se-N films showed notable COF values in humid environment ranging from 0.22 to 0.015 when tested using loads from 2 to 45 N. The excellent friction properties of Mo-Se-N films were associated to the crystallisation of a MoSe2 tribofilm in the wear scar. Moreover, we showed that modern pulsed DC HiTUS technology represents a suitable way of producing thin films with a variety of elemental compositions and desired mechanical and tribological properties, even from sensitive, semi-conducting and extremely low thermally conductive MoSe2 targets.

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More information

Accepted/In Press date: 17 October 2020
e-pub ahead of print date: 22 October 2020
Published date: 15 January 2021
Additional Information: Funding Information: Part of the work was carried out with the support of CEITEC Nano Research Infrastructure (ID LM2015041 , MEYS CR, 2016–2019), CEITEC Brno University of Technology. T.P. acknowledges the support from OPVVV grant Novel nanostructures for engineering applications No. CZ.02.1.01/0.0/0.0/16026/0008396. Funding Information: This work was supported by the Slovak Research and Development Agency [Grant No. APVV-17-0320 ], Scientific Grant Agency [ VEGA 1/0381/19 ], and Operational Program Research and Development [project ITMS 26210120010 ]. Funding Information: This work was supported by the Slovak Research and Development Agency [Grant No. APVV-17-0320], Scientific Grant Agency [VEGA 1/0381/19], and Operational Program Research and Development [project ITMS 26210120010]. This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No. 721642: SOLUTION. Part of the work was carried out with the support of CEITEC Nano Research Infrastructure (ID LM2015041, MEYS CR, 2016?2019), CEITEC Brno University of Technology. T.P. acknowledges the support from OPVVV grant Novel nanostructures for engineering applications No. CZ.02.1.01/0.0/0.0/16026/0008396. Funding Information: This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No. 721642 : SOLUTION. Publisher Copyright: © 2020 Elsevier B.V. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.
Keywords: Hardness enhancement, Low friction, Mo-Se-N, MoSe, Solid lubricant, Sputtering

Identifiers

Local EPrints ID: 454824
URI: http://eprints.soton.ac.uk/id/eprint/454824
ISSN: 0257-8972
PURE UUID: b89d93a7-056c-4dd2-a0e1-6a61eced2aaf
ORCID for Tomáš Polcar: ORCID iD orcid.org/0000-0002-0863-6287

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Date deposited: 24 Feb 2022 21:51
Last modified: 18 Mar 2024 03:19

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Contributors

Author: Tomáš Hudec
Author: Vitalii Izai
Author: Leonid Satrapinskyy
Author: Teodor Huminiuc
Author: Tomáš Roch
Author: Maroš Gregor
Author: Branislav Grančič
Author: Marián Mikula
Author: Tomáš Polcar ORCID iD

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