Journal
TRIBOLOGY LETTERS
Volume 58, Issue 2, Pages -Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11249-015-0508-3
Keywords
Diamond-like carbon; Tungsten; MoDTC; Friction and wear
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Funding
- National Natural Science Foundation of China [51375466, 51005218]
- Beijing Natural Science Foundation [3132023]
- Fundamental Research Funds for the Central Universities [2652012115]
- Tribology Science Fund of State Key Laboratory of Tribology [SKLTKF13B10]
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A systematic study was carried out to assess the influence of tungsten content on the tribological properties of tungsten-doped diamond-like carbon (W-DLC) coatings lubricated by molybdenum dithiocarbamate (MoDTC). Four W-DLC coatings with W doping content of 0.0 % (pure DLC), 3.08, 10.73 and 27.7 % were fabricated, respectively, following the microstructures, and mechanical properties of these W-DLC coatings were observed, and next, the friction and wear tests were conducted under boundary lubrication with MoDTC; finally, the valence states of tribofilms were identified by X-ray photoelectron spectroscope. The results showed that W-DLC coatings present lower coefficients of friction and higher wear rates under MoDTC lubrication comparing those under PAO lubrication. It also revealed that W content has little influence on anti-friction behaviors, while the wear rates decreased firstly and then increased with higher W content. It was proposed that the tribological properties of W-DLC coatings mainly depend on the ratio of hardness to Young's modulus (H/E), the degree of graphitization and the formation of tribofilms containing MoS2 and MoOx.
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