Novel Sibcn Fibers with Broad Band and Strong Electromagnetic Microwave Absorption Performance

The SiBCN fibers with excellent electromagnetic microwave (EMW) absorption performance were successfully prepared via polymer-derived ceramics (PDCs) and electrospinning methods at lower preparation temperature. The results showed that the in-situ generated free carbon improved the dielectric loss and properties of SiBCN fibers. In particular for the SiBCN fibers pyrolyzed at 1300 °C, the in-situ generated nano β-SiC crystallization increased the EMW absorption performance significantly. The minimum reflection loss (RL min ) of the SiBCN-3 reached -54.91 dB at 2.35 mm and the effective absorption band (EAB, RL ≤ −10 dB) reached 4.72 GHz (13.28-18 GHz, 1.75 mm). Hence, the SiBCN fibers prepared at low temperature giving good absorption performance and predicting a broader application prospect in the field of EMW absorption materials