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

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 solidphase 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. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

CPC-loaded Ni-Zn ferrite composites prepared by microwave solid-phase reaction exhibit excellent wave absorption properties that can meet the requirements of multiple frequency bands.