Electromagnetic wave absorption properties of ferrite and graphite cement-based composite materials

Electromagnetic wave absorption properties of cement-based composite material doped with ferrite and graphite (F/G/C) were investigated. The analysis focused on the main impacting factors of absorption performance and explored the mechanism of its influence by changing ferrite and graphite ratio. The results show that 20vol% graphite causes percolation effect and has great loss tangent. The main influence factor of absorbing depth is graphite, while the main factor impacting absorption width is ferrite. 20wt% 60μm ferrite, 10wt% 250μm ferrite and 30vol% graphtite is the best level combination and its reflectivity reached -32dB, which is obviously better than single form compound. Additionally, graphite doping improved space wave impedance,but the main absorption mechanism is still magnetic loss.