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The present work is concerned with the understanding of the tribologic behaviour of various fluorocarbon phases (graphite fluorides, fluorinated carbon nanofibres and carbon nanodiscs/nanocones). The intrinsic tribologic properties of the studied compounds are correlated to their structure and chemical composition (F/C ratio, C-F bonding type) in order to deduce the parameters monitoring the friction behaviour. In all cases the friction properties of the fluorinated derivatives are better than those of the initial carbon compounds. In the case of fluorinated carbon nanofibres, the friction improvement is attributed to the interfibres interactions reduction resulting from surface free energy decrease induced by the fluorination of superficial graphene layers. For fluorinated carbon nanodiscs/nanocones bulk structural effects are predominent as far as the lowest friction coefficients are obtained for fluorinated derivatives of initial graphitized nanoparticles. This bulk effect is confirmed by the graphite fluoridestribologic behaviours. In these last cases a supplementary improvement is associated to the presence of intercalated mineral fluorides in the graphite van der Waals gaps.
The present work is concerned with the understanding of the tribologic behaviour of various fluorocarbon phases (graphite fluorides, fluorinated carbon nanofibres and carbon nanodiscs/nanocones). The intrinsic tribologic properties of the studied compounds are correlated to their structure and chemical composition (F/C ratio, C-F bonding type) in order to deduce the parameters monitoring the friction behaviour. In all cases the friction properties of the fluorinated derivatives are better than those of the initial carbon compounds. In the case of fluorinated carbon nanofibres, the friction improvement is attributed to the interfibres interactions reduction resulting from surface free energy decrease induced by the fluorination of superficial graphene layers. For fluorinated carbon nanodiscs/nanocones bulk structural effects are predominent as far as the lowest friction coefficients are obtained for fluorinated derivatives of initial graphitized nanoparticles. This bulk effect is confirmed by the graphite fluoridestribologic behaviours. In these last cases a supplementary improvement is associated to the presence of intercalated mineral fluorides in the graphite van der Waals gaps.
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Solid lubricants; Fluorinated compounds ; Raman spectroscopy.
Solid lubricants; Fluorinated compounds ; Raman spectroscopy.
Como citar
PhilippeThomas,;
Jean-LouisMansot,;
Gros, O.;
Legras, L.;
Dubois, Marc;
Guérin, Katia;
Hamwi, André.
FRICTION PROPERTIES OF NEW FLUORINATED CARBON PHASES
,
p. 613-626.
In: First International Brazil Conference on Tribology TriboBr-2010 and 2nd Internacional Tribology Symposium of IFToMM,
Rio de Janeiro,
2010.
ISSN: -
, DOI 10.5151/5463-5463-17455
