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Mandal, Paranjayee; Ehiasarian, Arutiun; Hovsepian, Papken (2015)
Languages: English
Types: Unknown
The high temperature tribological applications of state-of-the-art diamond-like-carbon (DLC) coatings in automotive industry are often compromised due to their poor adhesion strength and low thermal stability. A molybdenum and tungsten doped carbon-based coating (Mo−W−C) is developed in order to overcome these limitations and to enhance tribological performance during boundary lubricated sliding at ambient and elevated temperature. The coating was deposited utilising HIPIMS technology. Mo−W−C coating showed lowest mean friction coefficient (µ=0.033) compared to a number of commercially available state-of-the-art DLC coatings when pin-on-disc experiments were carried out at ambient temperature. Similarly at 200°C, a significant reduction in friction coefficient was observed for Mo−W−C coating with increase in sliding distance unlike DLC coating. Raman spectroscopy revealed importance of combined Mo and W doping and tribochemically reactive wear mechanism of Mo−W−C coating during sliding. The significant decrease in friction and wear rate was attributed to the presence of graphitic carbon particles (from coating) and 'in-situ' formed metal sulphides (WS2 and MoS2, where metals from coating and sulphur from oil) in transfer layer.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • 1. B. Podgornik, D. Hren and J. ViZintin,“Low-friction behaviour of boundary-lubricated diamond-like carbon coatings containing tungsten”, Thin Solid Films, 476, 92-100, 2005
    • 2. B. Podgornik, S. Jacobson and S. Hogmark, “Influence of EP additive concentration on the tribological behaviour of DLC-coated steel surfaces”, Surface & Coatings Technology, 191, 357- 366, 2005
    • 3. S. Miyake, T. Saito, Y. Yasuda, Y. Okamoto and M. Kano, “Improvement of boundary lubrication properties of diamondlike carbon (DLC) films due to metal addition”, Tribology International, 37, 751-761, 2004
    • 4. A.P. Ehiasarian, J. G. Wen, and I. Petrov, " Interface microstructure engineering by high power impulse magnetron sputtering for the enhancement of adhesion ", J. Appl. Phys. 101(5), 054301, 2007
    • 5. P. Mandal, A.P. Ehiasarian and P. Eh. Hovsepian, "Tribological behaviour of Mo − W doped carbon-based coating at ambient condition", accepted manuscript in Tribology International, DOI: 10.1016/j.triboint.2015.04.017
    • 6. M. L. Frauwallner, F. López-Linares, J. Lara-Romero, C. E. Scott, V. Ali, E. Hernández and P. Pereira-Almao, “Toluene hydrogenation at low temperature using a molybdenum carbide catalyst”, App. Catalysis A: General, 394, 62-70, 2011
    • 7. X. Chen, Z. Peng, Z. Fu, S. Wu, W. Yue and C. Wang, “Microstructural, mechanical and tribological properties of tungsten-gradually doped diamond-like carbon films with functionally graded interlayers”, Surface & Coatings Technology, 205, 3631-3638, 2011
    • 8. Chemistry of the Elements. 2nd edition, N. N. Greenwood and A. Earnshaw - Chapter 23, Butterworth-Heinemann, 1997
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  • Discovered through pilot similarity algorithms. Send us your feedback.

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