Keywords

Boundary Lubrication, Elastohydrodynamic Lubrication, Raman Microspectrometry

Track

In Situ Tribology II: Material Tribology and Tribostesting Joint Session (Session 2B)

In Situ Raman Micro-Spectrometry Investigation of a Dynamic Contact Lubricated with Nanoparticles Dispersed in Base Oil - Study of Nanoparticles Transformations During their Transit Through the Tribologic Interface

In situ Raman microspectrometry is used to investigate the physical and chemical parameters existing in the tribologic interface constituted by a purely sliding sphere on plane contact lubricated with a 5% w/w dispersion of exfoliated graphite nanoparticles in 5P4E. The Raman analyses first demonstrate that 5P4E and nanoparticles are simultaneously present in the tribologic interface. The pressures and lubricant film thicknesses distribution profiles along diameters of the contact area, deduced from 1000 cm-1 5P4E raman band shifts and intensities, appeared not modified by the presence of the nanoparticles. The point spectra acquired on the tribologic interface feeded with fresh dispersion allowed us, using the intensities ratios of disorder (D) on graphite (G) bands of exfoliated graphite, to point out that nanoparticles undergo heavy structural changes during their transit through the contact identified as strong graphene plane misorientation induced by heavy shear stresses.

Authors and Company/Institution

J. Mansot and A. Molza, GTSI, Université des Antilles et de la Guyane, Pointe à Pitre, Guadeloupe, France
Y. Bercion and F. Begarin, C3MAG, Université des Antilles et de la Guyane, Pointe à Pitre, Guadeloupe. France