Molecular Dynamics Simulation of Friction Behavior of Nano-ZrO2 Reinforced PEEK/PTFE Composites
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.
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