Optical Characterization of Transfer Film Mechanics

Transfer films are effective mediums for enhancing surface properties such as friction performance, oxidation protection, wear resistance, electrical conductivity etc. However identifying the governing mechanics behind their operation remains a top priority in optimizing their performance. This project centers around identifying these mechanics through intuitive investigations of the transfer film before and after usage. Current examples include determining the mechanics of deposition and depletion for solid lubricant transfer films, measuring oxidation resistance from anti-oxidant additives, and establishing wear life based on in situ optical microscopy. optical characterization
PFTL Research Assistant(s):   Patrick S. M. Dougherty; Randyka Pudjoprawoto
Method(s) Employed:   High/low speed and load tribometry; in situ data acquisition, ex situ optical interferometry, energy dispersive x-ray spectroscopy, solid lubricant pellet fabrication, in situ optical microscopy
Rig(s) and/or Software(s) Employed:   In-house pellet-on-disc with slider pad tribometer for self-replenishing powder lubrication; Zygo New-View 7300 optical Interferometer; scanning electron microscope, optical video microscopy
Sponsor(s):   NSF GRFP Fellowship

Sample Results:

sample results

Select PFTL References:

1.) Dougherty, P., Pudjoprawoto R., Higgs III, C.F. "An Investigation of the Wear Mechanism Leading to Self-Replenishing Transfer Films," Journal of Wear. August, 2011

2.) Dougherty, P., Sunday, C., Higgs III, C.F. "Adaptive Solid Lubricant Transfer Films for Conductivity and Oxidation Control," Proceedings of: ASME/STLE International Joint Tribology Conference. Denver, CO, October, 7th 2012.