Analytical model and experimental validation of the local damage mechanism of solid lubricant films for metal matrix self-lubricating composites

Abstract

To explore the local damage mechanism of solid lubricant films for metal matrix self-lubricating composites, a simplified model for analyzing sliding friction contact and a mathematical model for calculating surface stresses of solid lubricant films are built. Based on the analytical model, we have investigated the local damage mechanisms of solid lubricant films under different theoretical and experimental conditions. Theoretical analyses suggest that surface damages can still occur in the local regions of solid lubricant films under a low normal load or a low friction coefficient; the damage degrees are aggravated and the damage mechanisms change with an increase in normal load and friction coefficient; and the sliding friction contact of TiAl matrix composites against GCr15 steel may be a desirable design. Finally, sliding friction experiments have been carried out and experimental results are found to be in qualitative agreement with theoretical analyses, validating the accuracy of the analytical model.