A sheath-core shaped ZrO₂-SiC/SiO₂ fiber felt with continuously distributed SiC for broad-band electromagnetic absorption

Silicon carbide (SiC), has been considered as one of the most suitable options for high-temperature electromagnetic absorption materials (EAMs), and it's still a challenge to achieve the broad-band absorption performance for SiC-based EAMs. In this work, according to the impedance matching principle, a kind of ZrO₂-SiC/SiO₂ fiber felt was prepared by combining chemical vapor infiltration (CVI) and oxidation treatment. SiC, as the electromagnetic (EM) absorber, was deposited continuously along the EM transparent ZrO₂ fibers, and the SiO₂ covered on SiC surface in the oxidation process, forming the unique sheath-core structure. It can form a large amount of interfaces to enhance the polarization loss, leading to excellent EM absorption performance with the reflection loss (RL) smaller than −8 dB at 4.50–18 GHz. The exploration results provide design inspiration to SiC-based EAMs with wide bandwidth strong absorption performance.