Wear mechanism of Mo−W doped carbon-based coating during boundary lubricated sliding

MANDAL, Paranjayee, EHIASARIAN, Arutiun and HOVSEPIAN, Papken (2015). Wear mechanism of Mo−W doped carbon-based coating during boundary lubricated sliding. In: SVC TechCon 2015, Santa Clara, USA, 27-30 April 2015.

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Abstract

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.

Item Type: Conference or Workshop Item (Paper)
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Nanotechnology Centre for PVD Research
Depositing User: Yashodhan Purandare
Date Deposited: 25 Jun 2015 09:18
Last Modified: 21 Aug 2015 12:21
URI: http://shura.shu.ac.uk/id/eprint/10434

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