Abstract
Conductive carbon black-coated BaZn2Fe16O27 composite absorbent was successfully prepared by a simple mechanical blending method. The phase composition, microstructure, magnetic and electromagnetic properties of the composite powder were analysed and characterized by XRD, SEM, VSM and network analyzer, and the reflection loss of the composite powder was simulated by software YRcomputor. Morphological analysis showed the micron-sized carbon black was uniformly coated on the surface of hexagonal flake ferrite. The sample has a dual-loss mechanism of dielectric and magnetic loss. The combination of carbon black and W-type BaZn2Fe16O27 effectively improves the impedance-matching condition and broadens the wave absorption band. The ferrite/carbon black composite (the ferrite/carbon black ratio is 100:4) shows microwave absorption with a maximum reflection loss of −23 dB with a thickness of 4 mm. It exhibits an effective absorption bandwidth (EAB) of 8.6 GHz with a thickness of 2.5 mm. Noting that, by adjusting the carbon black content and the thickness (2–4 mm), reflection loss (RL) lower than −10 dB can be achieved in the range of 8–16 GHz, which basically covers the X-band and Ku-band.
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This work was financially supported by the General projects of natural science research in Jiangsu Universities in 2020 (20KJB430028) and the “Blue Project” of Jiangsu Universities.
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Zhang, J. A low reflection absorbent conductive carbon black-coated BaZn2Fe16O27 composite covering X and Ku bands. J Mater Sci: Mater Electron 34, 158 (2023). https://doi.org/10.1007/s10854-022-09655-y
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DOI: https://doi.org/10.1007/s10854-022-09655-y