High temperature friction and wear properties of graphene oxide/polytetrafluoroethylene composite coatings deposited on stainless steel

N. Nemati, M. Emamy, S. Yau, J. K. Kim, D. E. Kim

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Polytetrafluoroethylene (PTFE) coating is known as a low friction material that is often used as a solid lubricant coating. However, due to its relatively weak mechanical strength, wear has been a critical issue which needs to be overcome. In the present work, a composite coating composed of PTFE and graphene oxide (GO) was investigated with the aim to significantly improve the wear resistance of PTFE, in both room and elevated temperature conditions. PTFE/GO (PG) composite coatings with varying amounts of GO in the PTFE matrix were successfully deposited on stainless steel (SS) substrates by the spin coating method. Both micro- and macro-scale tests were performed in order to assess the tribological properties of the coatings under a wide range of normal load. Results of the micro-scale tests showed that the coefficient of friction and the wear rate could be remarkably reduced to 0.1 and 0.65 × 10-9 mm3 N-1 m-1, respectively, with inclusion of 15 vol% of GO in the PTFE matrix. This coating also demonstrated low friction and wear properties up to 400 °C in the macro-scale tests. The superior tribological properties of the PG coating were attributed to the synergistic effects of PTFE and GO. Specifically, the existence of a rather homogeneous dispersion of high strength GO in the low friction PTFE matrix allowed for generation of a self-lubricating film along the wear track.

Original languageEnglish
Pages (from-to)5977-5987
Number of pages11
JournalRSC Advances
Volume6
Issue number7
DOIs
Publication statusPublished - 2016

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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