Effect of nano fillers on the properties of polytetrafluoroethylene composites: Experimental and theoretical simulations

Abstract

Polytetrafluoroethylene (PTFE) has excellent corrosion resistance and a low coefficient of friction; however, its high wear rate and low hardness severely limit its use. In the work, nano particles were used as fillers for PTFE. The composites were prepared by the homogeneous mixing of PTFE and other fillers and sintered at high temperatures. The work aimed to investigate the effect of various nano fillers (nanocarbon powders, graphene, fullerene, nano graphite powders, and nano copper powders) on the mechanical, thermal, and frictional properties of composites. The results of the experiments showed that the addition of graphene could improve the stress and strain values of the composites, and all the nano fillers could improve the thermal conductivity of the PTFE composites. The friction experiments showed that fullerenes could significantly improve the wear resistance of PTFE composites. In the theoretical simulation, the thermal conductivity of PTFE composites was predicted using ANSYS software, with the changes in the temperature and friction force in the friction process. The theoretical simulation results matched with the experimental values, which proved the accuracy of the theoretical simulations.

RETRACTED: Effect of surface treatment of carbon fibers on the mechanical and frictional properties of polyetheretherketone/polytetrafluoroethylene composites: Experimentation and finite element analysis

“…7,8 The more commonly used fillers have been mainly carbon fibers (CF), MoS 2 , glass fibers, copper powder, Al 2 O 3 , SiO 2 , and graphite. 9,10…”

Mechanical and Tribological Properties of Polytetrafluoroethylene Modified with Combined Fillers: Carbon Fibers, Zirconium Dioxide, Silicon Dioxide and Boron Nitride

“…As can be seen in Figure 3 d, compressive strength at 10% of relative deformation of PTFE with binary fillers increased by 50–55%, and the compressive strength increased by 69–73% compared to the initial PTFE in composites containing h-BN. Such changes in PCM compressive properties and hardness can be explained by the reinforcing effect of hard carbon fibers [ 39 ]. The increase in hardness and compressive strength is due to the fact that part of load is transferred from the polymer matrix to the fibers [ 40 ].…”

Experimentation and optimization of wear behavior on polytetrafluoroethylene composites using response surface methodology and bald eagle search optimization

“…However, better wear‐resistant was observed from the PTFE composite (both single and tri combination) compared with the plain PTFE. [ 19,32,34 ] Several types of research have proved that the increased range of filler concentration in PTFE composite helps to achieve a minimum wear rate. [ 35 ] The graph shows that the wear resistance capacity is more in halloysite filled PTFE than graphite, bronze, and plain PTFE.…”

“…Shore D hardness of the prepared 5 wt% composite improved by 45% and specific wear rate and friction coefficient decreased 93% and 25% respectively at a load of 1.5 MPa in comparison to virgin PTFE. Xiao and Ji [ 19 ] studied the effect of nanofiller on PTFE. The experimental results showed improvisation in thermal conductivity along with stress and strain.…”