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

Abstract 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.