Preparation and electromagnetic waves absorption performance of novel Fe₃Si/SiC/SiO₂ composites

The combination of dielectric materials and magnetic composition and microstructural design have been demonstrated to be an ideal method for achieving efficient electromagnetic wave (EMW) absorption. Herein, Fe₃Si/SiC/SiO₂ composites constructed by magnetic/dielectric multi-component were successfully constructed via an ingenious carbothermal reduction strategy. Notably, the obtained Fe₃Si/SiC/SiO₂ composites at 1600 ℃ demonstrate the outstanding microwave absorption at an extremely low fill rate of 15 wt%, with the minimum reflection loss (RL_min) of −64.77 dB and an effective absorption bandwidth (EAB) of 5.53 GHz. The efficient absorption properties of Fe₃Si/SiC/SiO₂ composites are due to the magnetic-dielectric loss effect, and impedance matching. Porous structure also enhances impedance matching, thereby augmenting the absorption capabilities of the material. In summary, this research work introduces a novel strategy for the design of EMW absorbents with strong absorption in multi/low frequency band, wide absorption band and lightweight.