Excellent Electromagnetic Wave Absorption of Iron‐Containing SiBCN Ceramics at 1158 K High‐Temperature

The enhancement of electromagnetic wave absorption at high‐temperature as well as oxidation is cutting‐edge issue in current electromagnetic functional materials due to the strong demand of stealth aircrafts or aero‐engines working in harsh environments. In this contribution, the excellent electromagnetic wave absorption at 1158 K (885 °C) with a minimum reflection coefficient (RC_min) of −12.62 dB and a wide effective absorption bandwidth (RC_min < –10 dB) of 3.2 GHz was achieved on iron‐containing siliconboron carbonitride (SiBCN) monolithic ceramics by using polymer‐derived ceramics (PDC) route, setting a new record for EM wave absorption materials at high‐temperature. In addition, these materials exhibited desirable mechanical properties and excellent high‐temperature resistance until 1400 °C in argon atmosphere and 885 °C in air atmosphere, respectively. This ingenious strategy is generally benefiting the promotion of EM wave absorption materials with great potential in antenna housings, radomes, areo‐engines, and stealth aircrafts in harsh environments.