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Influence of temperature on the microstructure and microwave absorption of C/Co composites

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Abstract

In this study, porous C/Co composites using corncobs as precursors to be used as a microwave absorbing material that is lightweight and has strong absorption and broad bandwidth. The microstructure and electromagnetic parameters of the C/Co composites were optimized by varying the calcination temperature to achieve enhanced attenuation capability and impedance matching. Low temperature is not enough to fully carbonize the corncobs and high temperature will destroy the integrity of the carbon sheet and appear holes, which are not conducive to the wave absorption performance. Benefiting from the hierarchically porous architecture and the optimized electromagnetic parameters, the C/Co composite calcined at 700 °C has a minimum reflection loss (RL) of − 64.53 dB at 12 GHz with a matching layer thickness of 2.14 mm; and the maximum absorption bandwidth of RL values below − 10 dB is 3.1 GHz (8.7–11.8 GHz) with a matching layer thickness of 2.55 mm. The C/Co composites with strong absorption, broad effective absorption bandwidth, and lightweight can be used as high-performance microwave absorbers.

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All data generated or analysed during this study are included in this published article.

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Funding

This work was financially supported by Natural Science Basic Research Plan in Shaanxi Province of China (Grant No. 2020JQ-912), Innovative Talent Promotion Program Youth Science and Technology Rising Star Project (Grant No. 2023KJXX-075) and General Project (Youth) of Shaanxi Provincial Natural Science Basic Research Program (Grant No. 2023-JC-QN-0523).

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Authors and Affiliations

  1. School of Materials Engineering, Xi’an Aeronautical University, Xi’an, 710077, China

    Lu Yuanyuan, Zhou Yingying, Yang Chaoqun, Wang Beibei & Chen Haobo

  2. School of Mathematical Sciences, Soochow University, Suzhou, 215006, China

    Lu Yuanyuan

  3. AI and Big Data Application Research Institute, Ningbo University of Finance & Economics, Ningbo, 315175, China

    Yu Jiuhong

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  1. Lu Yuanyuan
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  2. Yu Jiuhong
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Contributions

LY, YJ and ZY designed and performed the experiments. YJ initiated and supervised the research. LY prepared the first draft of the manuscript. YC, WB and CH analyzed and discussed the data. All authors edited and revised the manuscript. All authors have given approval to the final version of the manuscript.

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Correspondence to Yu Jiuhong.

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Yuanyuan, L., Jiuhong, Y., Yingying, Z. et al. Influence of temperature on the microstructure and microwave absorption of C/Co composites. J Mater Sci: Mater Electron 34, 1892 (2023). https://doi.org/10.1007/s10854-023-11245-5

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