Wave-absorbing properties of Ni-Zn ferrites loaded on coal-based, densely porous light carbon functional materials

Abstract

Composites obtained from coal-based porous carbon (CPC)–loaded Ni-Zn ferrite often have good wave absorption properties. Here, CPC/Ni0.8Zn0.2Fe2O4 composite was innovatively prepared by microwave solid-phase reaction. The effects of microwave power and time on the sintering of the Ni-Zn ferrite precursor powder were explored, as were the effects of the CPC pore structure and the mass ratio of CPC to Ni-Zn ferrite on the wave absorption properties of the composites. Results showed that the CPC matched well with the Ni-Zn ferrite, especially at a 50% ratio at which the composite attained a maximum attenuation of −20.8 dB at 15.2 GHz with an effective bandwidth of 4.4 GHz. The CPC broadened the wave absorption performance of Ni-Zn ferrite and the resulting composite had excellent wave absorption performance that could meet the requirements of multiple frequency bands by adjusting the coating thickness.