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Imaging friction tracks at diamond surfaces using reflection electron microscopy.

Z L Wang1

  • 1Department of Physics, Arizona State University, Tempe 85287-1504.

Journal of Electron Microscopy Technique
|February 1, 1991
PubMed
Summary
This summary is machine-generated.

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Reflection electron microscopy (REM) revealed surface modifications on diamond (001) after friction. Adhesion, not micro-cleavage, explains the observed friction tracks and grooves.

Area of Science:

  • Materials Science
  • Surface Science
  • Tribology

Background:

  • Natural diamond (001) surfaces are crucial in various applications.
  • Understanding friction mechanisms on diamond is essential for material performance.
  • Previous models for diamond friction include adhesion and micro-cleavage.

Purpose of the Study:

  • To investigate the surface structure of natural diamond after friction experiments.
  • To elucidate the dominant friction mechanism on diamond (001) surfaces.

Main Methods:

  • Polished natural diamond (001) surfaces were subjected to friction experiments using a diamond needle.
  • Friction was applied under pressures below a critical value.
  • Reflection electron microscopy (REM) was used to image the resulting surface topography and structure.

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Main Results:

  • REM imaging revealed distinct friction tracks with non-uniform contrast on the diamond surface.
  • Darker image contrast was observed in contacted areas, suggesting top atomic layer structural modification.
  • Grooves were formed due to the indentation of the diamond needle into the surface under high pressure.
  • Evidence for plastic deformation was observed, but no cracking was detected.

Conclusions:

  • The observed surface features, including grooves and structural modifications, support an adhesion-driven frictional mechanism.
  • The findings contradict the micro-cleavage model as the primary cause of friction-induced surface changes on diamond.
  • REM is effective in visualizing nanoscale surface alterations during tribological processes on diamond.