Microwave Absorbing Performances of Silica Matrix Composites Reinforced by Carbon Nanotubes and Carbon Fiber

Multilayered composites consisting of silica, carbon nanotubes (CNTs), and continuous carbon fibers (Cf) were prepared by hot-pressing technique. Microstructures of different layer presented few pores of the composites. The thermal stability of the composites was analyzed by TG/DTA measurement. After being heat treated at 400 degrees C for 10h, the composites retained the equivalent shielding property compared to room temperature, and the impedance matching property at material/wave interface was improved slightly. The multilayer CNTs/Cf/silica composites have not only the excellent absorbing properties but also the outstanding thermal stability, and it can be a promising candidate for high-temperature electromagnetic interference shielding applications.