Abstract
This paper studied the tribological behavior of two kinds of synthesized microcapsules filled with ionic liquids (e.g., [OMIM]Br and [OMIM]BF4), acting as smart tribological additives for water-based drilling mud. Experimental results demonstrated that both microcapsules are effective in friction reduction, with the coefficient of friction decreased by 25.7% (from 0.35 to 0.26) for [OMIM]Br and 22.9% (from 0.35 to 0.27) for [OMIM]BF4 when compared with the basic mud. The significant decrease in coefficient of friction was associated with the chemical reactions that occurred between released lubricants and the contact surface during sliding process, where a protective film was generated in between. It was also observed that higher concentrations of microcapsules provided more released core materials resulting in smoother worn surfaces, indicating better wear performance. In addition, fiction tests carried out at different loading conditions revealed distinct changes in tribological performance, indicating a strong correlation between microcapsules responses and load stimuli. This study provides evidence for the realization of smart lubrication that can be adapted into large-scale applications.
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