期刊
CARBON
卷 188, 期 -, 页码 376-384出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2021.12.044
关键词
Magnetic-dielectric composite; Carbon foam; Microwave absorption; High temperatures
资金
- Program for the National Natural Science Foundation of China [52071053, U1704253, 52103334]
- China Postdoctoral Science Foundation [2020M670748, 2020M680946]
- Fundamental Research Funds for the Central Universities [DUT20GF111]
In this study, a novel CI/CF composite with a three-dimensional reticulated structure is fabricated for the first time, which can simultaneously regulate the dielectric and magnetic losses in wide temperature ranges. The CI/CF composites show ultra-stable wide effective absorbing bandwidths at a thickness of only 1 mm, making them promising materials for high-temperature microwave absorption.
Microwave absorbing materials with stable-wide effective absorbing bandwidth (EAB) are regarded as desirable candidates for eliminating electromagnetic interference at high temperatures. However, it still remains a challenge to simultaneously regulate the dielectric and magnetic losses in wide temperature ranges for the above excellent microwave absorption performance. Herein, a novel magnetic-dielectric composite of carbonyl iron (CI)/carbon foam (CF) with three-dimensional (3D) reticulated structure is fabricated for the first time by carbonization and vacuum impregnation. 3D reticulated structure not only provides well-defined conductive paths and controlled electrical conductivity-temperature characteristics for optimizing dielectric loss, but also induces structural magnetic loss through induced currents to retard the attenuation of magnetic loss at high temperatures. Benefiting from the synergistic regulation of dielectric and magnetic losses, CI/CF composites show the ultra-stable wide EABs at a thickness of only 1 mm, maximum EAB of 8.48 GHz and minimum EAB of 8.32 GHz in the temperature range of 298-573 K. This work provides inspirations for construction of high-temperature microwave absorbing materials with tunable magnetic and dielectric losses.
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