Abstract
The usefulness of microtribological theories depends on their application to interfaces of a larger scale. Contact conditions over a large area, however, are not uniform but are a consequence of the geometry of each interface as well as the deformation of the supporting materials on either side of the interface. As a result, surfaces which have statistically uniform topography on the microscale may still exhibit non-uniform sliding friction behavior. In this study, we measure periodic friction force variation during slow speed sliding of a ceramic slider on a lubricated, carbon-overcoated aluminum disk. Using a phase-shifting interference microscope, we measure the geometry of the entire sliding track. Together with the slider geometry, this information can be used to characterize the surface conformity of the sliding interface at every point along the track. We calculate a “conformity index” and correlate it to the friction.
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