Tribological properties of low-temperature graphite fluorides. Influence of the structure on the lubricating performances

Philippe Thomas (1) , Karl Delbé (1) , David Himmel (1) , Jean-Louis Mansot (1) , Franck Cadoré (1) , Katia Guérin (2) , Marc Dubois (2) , Céline Delabarre (2) , André Hamwi (2)

1 GTSI - Groupe de Technologie des Surfaces et Interfaces [URp2_2]
2 LMI - Laboratoire des Matériaux Inorganiques

The present work is concerned with the study of the tribological properties of various fluorinated carbon phases obtained at room temperature and then post-treated under fluorine atmosphere at different temperatures. The tribological tests evidence good intrinsic properties for all the compounds (friction coefficient in the range 0.07-0.09). Differences appear after few cycles. Friction measurements after 100 cycles and complementary Raman analyses of the tribofilm remaining in the wear scar point out that long term tribologic properties of the fluorinated compounds strongly depend on the evolution undergone by the materials under friction. The release of HF molecules, the loss of fluorine and partial rebuilding of graphitic phases are at the origin of the degradation of the friction properties. The good properties of the compounds post-treated at temperature in the range 150-300 °C are attributed to the chemical and structural stability of these compounds under friction.

Mots clés: Raman spectroscopy

Domaines: Mécanique des matériaux [physics.class-ph]; Mécanique des matériaux [physics.class-ph]

Philippe Thomas, Karl Delbé, David Himmel, Jean-Louis Mansot, Franck Cadoré, et al.. Tribological properties of low-temperature graphite fluorides. Influence of the structure on the lubricating performances. Journal of Physics and Chemistry of Solids, 2006, 67 (5-6), pp.1095-1099. ⟨10.1016/j.jpcs.2006.01.084⟩. ⟨hal-00756133⟩