Microstructure and electromagnetic wave absorption properties of RGO-SiBCN composites via PDC technology

摘要

Herein, we demonstrate the incorporation of graphene oxide (GO) into silicoboron carbonitride (SiBCN) ceramics by polymer derived ceramics (PDCs) technology to improve dielectric and electromagnetic wave absorption capacity. Different amounts of GO content and annealing temperatures are used to optimize the permittivity of fabricated composites. Results show that RGO-SiBCN composite, with 10 wt% GO, delivers excellent electromagnetic reflection coefficient (RC) of - 34.56 dB and effective electromagnetic absorption bandwidth (EAB) of 2.46 GHz in the X-band. Enhanced performance of RGO-SiBCN composite is mainly due to the conductive loss and polarization loss. Furthermore, high-temperature annealing (1700 degrees C) resulted in precipitation of SiC nanocrystals and formation of nanoscale interfaces. Hence, RC and EAB of SiBCN reached 46.73 dB and 3.32 GHz, respectively. The present study provides novel insight into fabrication and EMW absorption performance of SiBCN-based composites. It is believed that SiBCN-based composite possess superior microwave absorption property and have great potential in a wide range of applications.