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2013
Conference Paper
Titel

Atomistic simulations of tribochemical reactions at carbon surfaces

Titel Supplements
Abstract
Abstract
Tribochemical reactions occurring at carbon surfaces have a strong influence on the friction and wear properties of diamond and diamond-like carbon (DLC) surfaces [1]. Molecules that are in contact with a surface can undergo dissociative chemisorption before or during tribological load and passivate dangling bonds. This prevents the formation of strong covalent bonds between sliding surfaces, resulting in a lower friction coefficient. Furthermore, molecules can physisorb at passivated carbon surfaces by means of hydrogen bonds and van-der-Waals interactions. This can lead to the formation of adsorbed layers that in turn modify the friction properties of the surface. These mechanisms are believed to play a crucial role in the superlubricity that tetrahedral-amorphous carbon (ta-C) surfaces exhibit when in contact with certain OH-containing molecules (e.g. Hydrogen peroxide, glycerol or glycerol monooleate (GMO)) [2,3].
Author(s)
Moras, G.
Pastewka, L.
Mulakaluri, N.
Gumbsch, P.
Moseler, M.
Gola, M.
Hauptwerk
WTC 2013, 5th World Tribology Congress. Extended abstracts
Konferenz
World Tribology Congress (WTC) 2013
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Language
English
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Fraunhofer-Institut für Werkstoffmechanik IWM
Tags
  • tribochemistry

  • diamond

  • diamond-like carbon

  • atomistic simulations

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