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.