Tribological performance of hybrid PTFE/serpentine composites reinforced with nanoparticles

Abstract

The tribological properties tests were conducted on several polytetrafluoroethylene (PTFE)/serpentine solid self-lubricating nanocomposites reinforced with different nanoparticles, such as nano-β-carborundum whisker (β-SiCw), nano-copper and nano-TiO2. The friction coefficient, wear rates, wear surface morphology and transfer film were studied. The experimental results indicated that the nano-fillers remarkably improve the antifriction and wear resistance of these composites. The highest wear resistance was found for composites containing (1) 5% Ser.+5% β-SiCw (modified and treated by titanate coupling agent), (2) 5% Ser.+5% β-SiCw (unmodified with coupling agent) and (3) 5% Ser.+20% nano-Cu. Wear tests and microanalysis showed that the variety of nano-fillers and continuity of transfer film on counterface significantly affected the friction and wear properties of the ternary composites.