Co-electrospun SiC nanoparticle-decorated SiC fiber hybrid materials towards highly effective and broadband electromagnetic attenuation performance

High-temperature resistant performance for thermal end components has always been a key development direction in advanced microwave absorption materials. SiC fibrous materials could be served as the ideal candidate to meet the challenge of both lightweight and high temperature resistance. However, the relatively weak microwave attenuation capacity of pure SiC fibers greatly limit the further application. Herein, highly crystallized SiC nanoparticles (SiC_np) were decorated into the SiC fiber (SiC_f) matrix via co-electrospinning and high temperature pyrolysis. The resultant SiC_np@SiC_f composite fiber material possesses abundant heterogeneous interfaces to fascinate the dielectric loss, as well as the enhancement of conductivity loss. The optimized SiC_np@SiC_f sample pyrolyzed at 1300 °C exhibits a minimal reflection loss (RL_min) of −57.04 dB at 6.84 GHz, and the effective absorption bandwidth (EAB) reaches as wide as 7.5 GHz at 2.7 mm. With the filler content of only 10 wt%, the prepared SiC_np@SiC_f hybrid material could be applied as highly efficient and broadband ceramic microwave absorber.