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The W-cluster reactive sites interaction model for WDLC coatings with ionic liquids
ID Arshad, Muhammad Shahid (Author), ID Čoga, Lucija (Author), ID Geue, Thomas M. (Author), ID Kovač, Janez (Author), ID Cruz, Sandra M.A. (Author), ID Kalin, Mitjan (Author)

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Abstract
This study investigates the use of 1,3-dimethylimidazolium dimethylphosphate ionic liquid (IL) additive in glycerol base oil for improving the lubrication-properties of tungsten-doped diamond-like carbon (WDLC) coatings. Tribological tests were conducted at various applied loads (5 N, 10 N, 20 N) and elevated temperature (100 °C), and the addition of 1 wt% of IL resulted in a significant reduction (∼50%) in friction-coefficient. In-situ neutron-reflectometry analysis revealed a multi-step tribofilm formation mechanism involving IL and W-clusters, resulting in the formation of a 1.24-nm thick tribofilm on the WDLC surface within the first 30-minutes of the friction experiment. The reaction kinetics for tribofilm formation are discussed involving dissociation of dimethylphosphate into dioxo-phosphate, which interacts with W-clusters to form tungsten phosphates and cations adsorbed on their surface.

Language:English
Keywords:W-doping DLC coatings, ionic-liquid, friction, neutron reflectometry
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Version of Record
Year:2023
Number of pages:11 str.
Numbering:Vol. 185, art. 108550
PID:20.500.12556/RUL-145655 This link opens in a new window
UDC:539.92
ISSN on article:0301-679X
DOI:10.1016/j.triboint.2023.108550 This link opens in a new window
COBISS.SI-ID:150840579 This link opens in a new window
Publication date in RUL:04.05.2023
Views:734
Downloads:90
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Record is a part of a journal

Title:Tribology international
Shortened title:Tribol. int.
Publisher:Elsevier
ISSN:0301-679X
COBISS.SI-ID:26558976 This link opens in a new window

Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Secondary language

Language:Slovenian
Keywords:W-doping DLC premazi, ionska tekočina, trenje, nevtronska reflektometrija

Projects

Funder:EC - European Commission
Funding programme:H2020
Project number:685451
Name:ERA-NET for materials research and innovation
Acronym:M-ERA.NET 2

Funder:EC - European Commission
Funding programme:M-ERA.NET 2
Project number:M-ERA-NET2/0014/2016
Acronym:GreenCOAT

Funder:ARRS - Slovenian Research Agency
Project number:P2-0231
Name:Tribologija

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