Efficient preparation of high-frequency wave-absorbing SiC/graphene composite powder

This article delves into the efficient preparation of high-frequency wave-absorbing SiC/graphene composite powder, focusing on the regulation of dielectric properties through the adjustment of carbon-silicon molar ratios, sintering temperatures, and Fe catalyst content. The study highlights the importance of these parameters in achieving optimal wave-absorbing performance. The synthesis process involves a carbothermal reduction method, which preserves the conductive network of graphene and the dielectric properties of 3C-SiC. The article explores the effect of temperature and carbon-silicon molar ratio on the product, the role of the iron catalyst in the synthesis, and the microstructural analysis of the composite powder. Additionally, it provides a detailed analysis of the chemical structure and the formation mechanism of the 3C-SiC/graphene composite powder. The electromagnetic wave absorption properties of the composite powder are thoroughly examined, with a focus on the dielectric and magnetic loss mechanisms. The article concludes with a comparison of the 3C-SiC/graphene composite powder with existing SiC-based microwave-absorbing materials, highlighting its superior performance and potential for future applications.