Friction wear thermal expansion and mechanical properties of halloysite-glass fiber/polytetrafluoroethylene composite

The polytetrafluoroethylene (PTFE) composite filled with glass fiber (GF) and halloysite (HNTs) were prepared by cold forming and sintering. The effects of the filler type and its matching on the interface, frictional property, linear expansion coefficient and mechanical property of PTFE composites were investigated. The results indicate that filling with HNTs suitably not only increases the friction property of GF/PTFE composites, but also causes the wear, thermal expansion and mechanical properties to increase. The wear rate of the HNTs-GF/PTFE ternary composite filled with 2.0% HNTs is reduced by 32.7% in comparison with GF/PTFE composite. The linear expansion coefficient (CTE) of this HNTs-GF/PTFE composite is reduced by almost 2 orders of magnitude compared with that of pure PTFE during high temperature. The elongation at break, tensile strength and bend strength of HNTs-GF/PTFE are improved by 40.0%, 2.3% and 7.1%, respectively.