The role of hydrogen atmosphere on the tribological behavior of non-hydrogenated DLC coatings against aluminum

E. Konca, Y. T. Cheng, A. M. Weiner, J. M. Dasch, A. T. Alpas

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Diamond-like carbon (DLC) coatings are promising candidates as tool coatings for dry machining of aluminum alloys as aluminum has a lower tendency to adhere to the DLC surface when compared to other hard coatings in ambient conditions. This study investigated the tribological behavior of non-hydrogenated DLC coatings against a 319 Al alloy in various environments including ambient air (47% RH), vacuum (6.65 10- 4 Pa), inert gases (Ar, He, and N2) and a mixture of 60% He-40% H2. Unlike the results from the other test conditions, significantly low coefficient of friction (COF) values, ranging between 0.01-0.02, were observed in the 60% He-40% H2 mixture after a brief period with a high COF of 0.70. The formation of a carbonaceous tribolayer on the counterface and the passivation of the sliding surfaces by the chemisorption of hydrogen were suggested as mechanisms that might have been responsible for the very low COF behavior of the non-hydrogenated DLC coatings in the 60% He-40% H2 mixture.

Original languageEnglish
Pages (from-to)178-186
Number of pages9
JournalTribology Transactions
Volume50
Issue number2
DOIs
StatePublished - 2007

Bibliographical note

Funding Information:
The authors thank Teer Coatings Ltd (Worcestershire, UK) for the DLC coatings received for this study. Micro-Raman spectra of the samples were performed by Charlene Hayden (GM R&D, CES Lab.), and discussions with Yue Qi (GM R&D, MPL Lab.) were very helpful. Financial support from NSERC and GM of Canada through the Industrial Chair Program at the University of Windsor is gratefully acknowledged.

Keywords

  • Adsorption
  • Aluminum
  • DLC
  • Friction
  • Hydrogen
  • Pin-on-Disc
  • Transfer Layer
  • Tribology

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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