An approximate model for the migration of solid lubricant on metal matrix self-lubricating composites. (January 2016) - Xu, Zengshi
Abstract: The self-lubricating effects of metal matrix self-lubricating composites are based on migrating solid lubricant from matrix to worn surface, which results in the formation of transferred film mainly containing solid lubricant. To explore the migration mechanism of solid lubricant and calculate the thickness of transferred film, an approximate model is developed. The influence of normal load, friction coefficient, volume fraction of solid lubricant and yield strength of solid lubricant are investigated based on the model. A comparison of theoretical and experimental data suggests that theoretical data is in qualitative agreement with experimental data, implying that the model can be expected to give recommendations for designing metal matrix self-lubricating composites. Graphical abstract: Thickness of the transferred film on the worn surface during the first 900 sliding passes with different parameters: (a) normal load, (b) friction coefficient, (c) volume fraction of solid lubricant and (d) yield strength of solid lubricant Highlights: An approximate model is built for analyzing the solid lubricant migration. Based on the model, the thickness of transferred film is calculated. Theoretical data obtained is in qualitative agreement with experimental data. Model can give guidance for designing the metal matrix self-lubricating composites.