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  4. Electron microscopic evidence for a tribologically induced phase transformation as the origin of wear in diamond
 
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2014
Journal Article
Titel

Electron microscopic evidence for a tribologically induced phase transformation as the origin of wear in diamond

Abstract
Tribological testing of a coarse-grained diamond layer, deposited by plasma-enhanced chemical vapor deposition, was performed on a ring-on-ring tribometer with a diamond counterpart. The origin of the wear of diamond and of the low friction coefficient of 0.15 was studied by analyzing the microstructure of worn and unworn regions by transmission and scanning electron microscopy. In the worn regions, the formation of an amorphous carbon layer with a thickness below 100 nm is observed. Electron energy loss spectroscopy of the C-K ionization edge reveals the transition from sp 3-hybridized C-atoms in crystalline diamond to a high fraction of sp 2-hybridized C-atoms in the tribo-induced amorphous C-layer within a transition region of less than 5 nm thickness. The mechanically induced phase transformation from diamond to the amorphous phase is found to be highly anisotropic which is clearly seen at a grain boundary, where the thickness of the amorphous layer above the two differently oriented grains abruptly changes.
Author(s)
Zhang, X.
Schneider, R.
Müller, E.
Mee, M.
Meier, S.
Gumbsch, P.
Gerthsen, D.
Zeitschrift
Journal of applied physics
Funder
Deutsche Forschungsgemeinschaft DFG
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DOI
10.1063/1.4865742
Externer Link
Externer Link
Language
English
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Fraunhofer-Institut für Werkstoffmechanik IWM
Tags
  • diamond

  • elemental semiconduct...

  • transmission electron...

  • carbon

  • amorphous semiconduct...

  • friction

  • electron energy loss ...

  • amorphous state

  • phase transitions

  • focused ion beam tech...

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