C,N-codoped MoSi₂ ceramic with excellent heat resistance for microwaves absorption application.

ABSTRACT: 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.

SUBMITTER: Yang Z 

PROVIDER: S-EPMC7428230 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature