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.

Keywords:

• Polymer
• Composites
• Nanoparticle
• Tribology

Acknowledgements

The paper is based upon work supported by the Key Laboratory of Fundamental Science of Mechanical Structure and Material Science under Extreme Condition for National Defence in Yanshan University.