Muhammad Shahid Arshad (Author), Lucija Čoga (Author), Thomas M. Geue (Author), Janez Kovač (Author), Sandra Cruz (Author), Mitjan Kalin (Author)

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.

Keywords

W-doping DLC coatings;ionic-liquid;friction;neutron reflectometry;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 539.92
COBISS: 150840579 Link will open in a new window
ISSN: 0301-679X
Views: 142
Downloads: 13
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: Slovenian
Secondary keywords: W-doping DLC premazi;ionska tekočina;trenje;nevtronska reflektometrija;
Type (COBISS): Article
Pages: str. 1-11
Issue: ǂVol. ǂ185
Chronology: 2023
DOI: 10.1016/j.triboint.2023.108550
ID: 18799040