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

P. Mandal, A.P. Ehiasarian, P.Eh. Hovsepian

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

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 utilis-ing HIPIMS technology. MoW -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 MoW -C coating with increase in sliding distance unlike DLC coating. Raman spec-troscopy revealed importance of combined Mo and W doping and tribochemically reactive wear mechanism of MoW -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 (WS 2 and MoS 2 , where metals from coating and sulphur from oil) in transfer layer.
LanguageEnglish
Title of host publication58th Annual Technical Conference Proceedings
Place of PublicationMaterials Park
Pages1-6
Number of pages6
Publication statusPublished - 25 Apr 2015
EventSociety of Vacuum Coaters Annual Technical Conference - Santa Clara, United States
Duration: 25 Apr 201530 Apr 2015
Conference number: 58

Conference

ConferenceSociety of Vacuum Coaters Annual Technical Conference
CountryUnited States
CitySanta Clara
Period25/04/1530/04/15

Fingerprint

Carbon
Wear of materials
Coatings
Diamond
Diamonds
Friction
Metals
Tungsten
High temperature applications
Molybdenum
Bond strength (materials)
Sulfides
Automotive industry
Sulfur
Oils
Thermodynamic stability
Doping (additives)
Temperature

Keywords

  • diamond-like-carbon
  • carbon-based coating
  • boundary lubricated sliding
  • lubricant
  • tribology

Cite this

Mandal, P., Ehiasarian, A. P., & Hovsepian, P. E. (2015). Wear mechanism of Mo-W doped carbon-based coating during boundary lubricated sliding. In 58th Annual Technical Conference Proceedings (pp. 1-6). Materials Park.
Mandal, P. ; Ehiasarian, A.P. ; Hovsepian, P.Eh. / Wear mechanism of Mo-W doped carbon-based coating during boundary lubricated sliding. 58th Annual Technical Conference Proceedings. Materials Park, 2015. pp. 1-6
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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 utilis-ing HIPIMS technology. MoW -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 MoW -C coating with increase in sliding distance unlike DLC coating. Raman spec-troscopy revealed importance of combined Mo and W doping and tribochemically reactive wear mechanism of MoW -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 (WS 2 and MoS 2 , where metals from coating and sulphur from oil) in transfer layer.",
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Mandal, P, Ehiasarian, AP & Hovsepian, PE 2015, Wear mechanism of Mo-W doped carbon-based coating during boundary lubricated sliding. in 58th Annual Technical Conference Proceedings. Materials Park, pp. 1-6, Society of Vacuum Coaters Annual Technical Conference, Santa Clara, United States, 25/04/15.

Wear mechanism of Mo-W doped carbon-based coating during boundary lubricated sliding. / Mandal, P.; Ehiasarian, A.P.; Hovsepian, P.Eh.

58th Annual Technical Conference Proceedings. Materials Park, 2015. p. 1-6.

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

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AB - 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 utilis-ing HIPIMS technology. MoW -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 MoW -C coating with increase in sliding distance unlike DLC coating. Raman spec-troscopy revealed importance of combined Mo and W doping and tribochemically reactive wear mechanism of MoW -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 (WS 2 and MoS 2 , where metals from coating and sulphur from oil) in transfer layer.

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Mandal P, Ehiasarian AP, Hovsepian PE. Wear mechanism of Mo-W doped carbon-based coating during boundary lubricated sliding. In 58th Annual Technical Conference Proceedings. Materials Park. 2015. p. 1-6