Size-dependent electromagnetic wave absorption of 3C–SiC particles

Abstract

The potential application of 3C–SiC for electromagnetic wave (EMW) absorption in harsh environments is significant. Understanding the impact of particle size on the EMW absorption characteristics of 3C–SiC is crucial for guiding material selection. In this study, 3C–SiC samples with varying particle sizes were obtained through high-temperature heat treatment of nano-particles and high-temperature sintering reaction, and the EMW absorption properties were explored. The results reveal that 3C–SiC particles with a medium particle size (D₅₀) of 65 nm exhibit a notable minimum reflection loss value (RL_min) of −68.57 dB at 9.2 GHz with a thickness of 3.83 mm. Moreover, the efficient absorption band (EAB) covers the entire X-band and a portion of the Ku-band. The research suggests that a reduction in particle size enhances dielectric relaxation polarization, thereby improving the EMW absorption performance.