Microwave absorption (MA) materials with high heat resistance have a wide range of applications in many fields. In this work, a C,N-codoped MoSi₂ ceramic was prepared via a facile solid-phase reaction method and its MA properties was investigated. On the one hand, the results indicate that this ceramic possesses excellent heat resistance and the weight of the MoSi₂ is almost constant when the temperature is lower than 800°C. On the other hand, this ceramic shows good MA performance when the filler loading ratio increases to 30 vol%, the value of reflection loss (RL) could reach to −17.70 dB at 7.44 GHz with the thickness of 2.0 mm and the effective electromagnetic absorption bandwidth (RL below −10 dB) could reach to 1.88 GHz (9.28–11.16 GHz) with the thickness of 1.5 mm. Multi-polarization resonance loss is considered as the predominant attention mechanism on the MA performance of this MoSi₂ ceramic. This research provides a new idea for understanding resonance mechanism and greatly expands the application scope of MoSi₂ ceramic in MA area.

具有高耐热性的微波吸收（MA）材料在许多领域有着广泛的应用。在这项工作中，通过简便的固相反应方法制备了C,N共掺杂MoSi _{2陶瓷，并研究了其MA性能。}一方面，结果表明该陶瓷具有优异的耐热性，并且当温度低于800℃时MoSi _{2的重量几乎恒定。}另一方面，当填料填充率增加到30 vol%时，该陶瓷表现出良好的MA性能，在2.0 mm的厚度和有效电磁吸收的情况下，反射损耗（RL）在7.44 GHz时可达-17.70 dB带宽（RL低于-10 dB）可达到1.88 GHz（9.28-11.16 GHz），厚度为1.5 mm。多极化共振损耗被认为是这种MoSi ₂陶瓷MA性能的主要关注机制。该研究为理解共振机理提供了新思路，极大拓展了MoSi ₂陶瓷在MA领域的应用范围。