Abstract
The aim of this work was to investigate the relationship between roughness parameters of wear surface and lubricating performance of 4-Cyano-4′-pentylbiphenyl (5CB) liquid crystal. After running-in with acetylacetone (Hacac), lubricating with 5CB realizes a significant friction reduction and generates a groove-structured wear surface with larger Sku, more negative Ssk, smaller Str, and a higher Svk/Spk, which are in good agreement with the roughness parameters that achieving lower friction. Chemical reactions in the running-in process with Hacac changes the morphology of wear debris and decreases its particle size and Si content, which are believed to be reasons for the formation of the groove-structured wear surface. Damaging the groove-structured wear surface, by introducing a process of washing up wear surfaces or lubricating with ethanol briefly between running-in with Hacac and lubricating with 5CB, changes roughness parameters of wear surface and induces higher friction coefficient. We hope this study will provide a new perspective to understand the effect of roughness parameters on tribological performance, and to provide references for surface designing.
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