Tribological properties of lubricant-filled carbon nanotubes

Abstract

This study investigates the incorporation of four different lubricants into the internal cavities of carbon nanotubes (CNTs) to create composite materials. The tribological properties of water-based nanofluids formulated with these composites were examined under varying conditions such as concentration and applied load. Surface analyses were also conducted to explore the lubrication mechanisms of the composites. Results showed that the friction coefficient of the composites decreased progressively during the friction process, ultimately exhibiting superior friction-reducing performance compared to the lubricants alone. This enhancement was attributed to the ability of the composites to release additives at the friction interface, forming a compound lubricating layer. Within this layer, the CNTs function as “micro-bearings,” further improving the lubricating effect.