Abstract:In order to explore and reveal the effect of nanometre zirconium dioxide (ZrO2) on the friction behavior of polyetheretherketone (PEEK)/polytetrafluoroethylene (PTFE) composites from the microstructure,four kinds of nano-ZrO2 filled PEEK/PTFE composites were prepared by adding mass fraction 4%,6%,8%,and 10% nano-ZrO2 to 10% PEEK/PTFE composite materials,respectively.Based on the molecular dynamics (MD) method,the friction models of PEEK/PTFE composites with different mass fractions of nano-ZrO2 sliding against iron were constructed.The results show that an appropriate amount of nano-ZrO2 can enhance the shear deformation resistance of PEEK/PTFE composite molecular chains,form strong van der Waals force between polymer molecular chains,and improve the friction properties of PEEK/PTFE composites.Nano-ZrO2 can effectively inhibit interlayer slip during friction,play a role in adsorbing polymer molecular chains in composites,so as to enhance interatomic interactions,and hinder internal slip of molecular chains during friction.The composites with mass fraction 6% nano-ZrO2 show the best friction performance.
