Dielectric and microwave absorption properties of resin-matrix composite coating filled with multi-wall carbon nanotubes and Ti_3SiC_2 particles

摘要

Lightweight resin-matrix composite coatings filled with multi-wall carbon nanotubes (MWCNTs) or/and Ti_3SiC_2 particles were fabricated, and the microstructure and complex permittivity of the coatings were detected. Owing to the synergistic effect of MWCNTs and Ti_3SiC_2 absorbents, the complex permittivity is effectively adjusted and the impedance matching is further optimized, ensuring the introduction of the incident electromagnetic waves. Meanwhile, the dipole movement, charge accumulation, micro-current and multiple scattering result in a much stronger dielectric loss and conductance loss to consume the incident electromagnetic waves. As a consequence, compared with MWCNTs/resin and Ti_3SiC_2/resin coatings, the MWCNTs-Ti_3SiC_2/resin coating exhibits favorable microwave absorption performance with a wider effective absorption bandwidth and much lower minimum reflection loss.