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Fluorinated Graphene: A Promising Macroscale Solid Lubricant under Various Environments.

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Area of Science:

  • Materials Science
  • Tribology
  • Nanotechnology

Background:

  • Graphene-based materials show potential as solid lubricants due to layered structure shear.
  • Limitations include macroscale friction and environmental sensitivity.
  • Developing high-performance, robust solid lubricants is crucial for mechanical engineering.

Purpose of the Study:

  • To fabricate and evaluate fluorinated graphene (FG) coatings for enhanced lubrication.
  • To investigate the friction reduction and environmental adaptability of FG.
  • To understand the mechanisms behind FG's superior tribological performance.

Main Methods:

  • Fabrication of FG coatings on stainless steel via electrophoretic deposition in ethanol.
  • Tribological testing to measure the coefficient of friction (COF) against pristine graphene and graphene oxide.
  • Analysis of surface energy, interlaminar shear strength, and tribofilm formation.

Main Results:

  • FG coatings reduced COF by 54.0% (vs. graphene) and 66.2% (vs. graphene oxide).
  • Enhanced lubrication attributed to low surface energy and shear strength.
  • Formation of robust metal-fluorine bonds created effective tribofilms.
  • FG coatings exhibited limited sensitivity to humidity due to hydrophobicity.

Conclusions:

  • Fluorinated graphene coatings offer superior solid lubrication compared to graphene and graphene oxide.
  • The hydrophobic nature and strong bonding contribute to excellent lubrication and environmental stability.
  • FG is a promising candidate for demanding mechanical engineering lubrication applications.