Dielectric and microwave absorption properties of resin-matrix composite coating filled with multi-wall carbon nanotubes and Ti 3 SiC 2 particles

Lightweight resin-matrix composite coatings filled with multi-wall carbon nanotubes (MWCNTs) or/and Ti3SiC2 particles were fabricated, and the microstructure and complex permittivity of the coatings were detected. Owing to the synergistic effect of MWCNTs and Ti3SiC2 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 Ti3SiC2/resin coatings, the MWCNTs-Ti3SiC2/resin coating exhibits favorable microwave absorption performance with a wider effective absorption bandwidth and much lower minimum reflection loss.