Simulation Analysis on Friction Performances of Polyetheretherketone Reinforced Polytetrafluoroethylene
Based on molecular dynamics simulation methods,the amorphous models of PEEK filled PTFE composites with different mass ratios(PEEK mass fraction is 5％,10％,15％,20％),was established,the friction pair model of PEEK/PTFE composite and iron was established.The results show that PEEK/PTFE composites with 10％mass fraction of PEEK have the best wear resistance,and the wear rate is decreased by 26.44％compared with PTFE material.It can be concluded that the binding energy at the friction interface is effectively reduced,thereby the wear rate is reduced by adding PEEK to the pure PTFE through analyzing the binding energy at the friction interface.By analyzing the atomic concentra-tion,radial distribution function,and free volume fraction at the friction interface,it can be concluded that the distribution of PEEK and PTFE molecular chains in the 10％PEEK/PTFE composites is more uniform.However,when the PEEK mass fraction is too high,uneven deformation and stress concentration are prone to occur within the crystal cell,and the PTFE molecules are more prone to detachment during friction so as to reduce the wear resistance.The research results reveal the mechanism of PEEK on the tribological properties of PTFE materials at the atomic scale,and reveal the strengthening mechanism of PEEK filled PTFE from the microscopic view,which provides theoretical reference for the development of new PTFE composites.
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