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Se Nanopowder Conversion into Lubricious 2D Selenide Layers by Tribochemical Reactions.

Philipp G Grützmacher1, Michele Cutini2, Edoardo Marquis2

  • 1Institute for Engineering Design and Product Development, Tribology Research Division, TU Wien, Vienna, 1060, Austria.

Advanced Materials (Deerfield Beach, Fla.)
|May 29, 2023
PubMed
Summary

This study introduces a novel method to create 2D selenides from selenium nanopowders directly on sliding metal surfaces. This process significantly reduces friction, offering a stable and effective solid lubrication solution.

Keywords:
2D transition metal dichalcogenidesfriction reductionin operando formationsolid lubricationtribochemistrytribofilms

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Area of Science:

  • Materials Science
  • Tribology
  • Nanotechnology

Background:

  • Transition metal dichalcogenide (TMD) coatings are vital for tribological applications.
  • Molybdenum disulfide (MoS2) is a common example, but selenides and tellurides offer superior properties.
  • Existing TMD synthesis methods face challenges with stability and environmental degradation.

Purpose of the Study:

  • To develop an in operando method for synthesizing 2D selenides from selenium nanopowders.
  • To investigate the tribochemical formation and lubricating properties of these in situ generated selenides.
  • To understand the atomistic mechanisms behind shear-induced selenide monolayer formation.

Main Methods:

  • Sprinkling selenium nanopowders onto sliding metallic surfaces (Mo and W thin films).
  • Advanced material characterization to analyze the formed tribofilm.
  • Ab initio molecular dynamics simulations under tribological conditions.

Main Results:

  • Successful tribochemical conversion of Se nanopowders into lubricious 2D selenides.
  • Significant reduction in the coefficient of friction to below 0.1 in ambient air.
  • Demonstration of thermal stability and prevention of outgassing in vacuum environments.
  • Highly reproducible results due to the reactivity of Se nanopowder with metal coatings.

Conclusions:

  • The in operando synthesis of 2D selenides offers a promising, straightforward approach for advanced solid lubrication.
  • This method overcomes the limitations of traditional TMD lubricity degradation caused by environmental factors.
  • The technique is suitable for replenishing solid lubricants on sliding components, enhancing durability and performance.