The Effect of High-Amplitude Deformation and High-Frequency Magnetic Field Exposure on the Elastic/Inelastic Properties of PTFE-Based Hybrid Nanocomposite Filled with Fe Cluster-Doped CNTs

摘要

The influence of high-amplitude torsional deformation (ε ～ 10~(-1) ÷ 10~(-2)) and high-frequency (2.4 GHz) magnetic field treatment on elastic/inelastic properties of PTFE-based new hybrid nanocomposites modified with a two-component filler (2.5 wt% Fe-cluster-doped CNT nanopowder + 5wt% chalcopyrite micropowder) was studied using low-frequency amplitude-independent (AIIF) and amplitude-dependent (ADIF) internal friction measurements. The behavior of elastic/inelastic properties of the new trial PTFE-based hybrid nanocomposite modified by a two-component filler (Fe-cluster-doped CNTs + chalcopyrite micro-particles) was investigated in dependence on high-amplitude torsional deformation (ε ～10~(-1) ÷ 10~(-2)) and post-deformation high-frequency (2.4 GHz) magnetic field exposure and additional thermal treatment, using AIIF and ADIF measurements. It is shown that self-healing of micro/nano-cracks nucleated in the deformed samples of the nanocomposite may be properly performed via their exposure to high-frequency magnetic field and the additional annealing at 200°C that leads to the recovery of the values of microplastic deformation beginning critical amplitude (εc) to the values even exceeding its initial magnitude by ～38%.