Low-cost preparation of Ni/C/CG composites for microwave absorption by recycling coal gangue

LIANG Li-ping; GAO Fei; WANG Ya-ke; ZHU Bao-shun; LI Guo-min

doi:10.19906/j.cnki.JFCT.2021066

Volume 50 Issue 1

Jan. 2022

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Article Navigation > Journal of Fuel Chemistry and Technology > 2022 > 50(1): 36-43

LIANG Li-ping, GAO Fei, WANG Ya-ke, ZHU Bao-shun, LI Guo-min. Low-cost preparation of Ni/C/CG composites for microwave absorption by recycling coal gangue[J]. Journal of Fuel Chemistry and Technology, 2022, 50(1): 36-43. doi: 10.19906/j.cnki.JFCT.2021066

Citation:

LIANG Li-ping, GAO Fei, WANG Ya-ke, ZHU Bao-shun, LI Guo-min. Low-cost preparation of Ni/C/CG composites for microwave absorption by recycling coal gangue[J]. Journal of Fuel Chemistry and Technology, 2022, 50(1): 36-43. doi: 10.19906/j.cnki.JFCT.2021066

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Low-cost preparation of Ni/C/CG composites for microwave absorption by recycling coal gangue

doi: 10.19906/j.cnki.JFCT.2021066

Institute of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China

Funds: The project was supported by the National Natural Science Foundation of China (51802212), the Natural Science Foundation of Shanxi Province (201801D221119), the Scientific and Technological Innovation Programs of High Education Institutions in Shanxi (2019L0617) and Shanxi Postgraduate Innovation Project (2020SY415)

Received Date: 2021-05-27
Rev Recd Date: 2021-06-28

Available Online: 2021-07-19

Publish Date: 2022-01-25

Abstract

Abstract

With coal gangue (CG) as the carbon-containing carrier, starch as supplementary C source and nickel nitrate as Ni source, Ni/C/CG composite microwave absorbing materials were prepared by a solution impregnation and then a carbothermal reduction process. The influence of the carbothermal reduction temperature on the composition, microstructure and performance of materials was carefully studied. It was found that, the carbothermal reduction temperature had a great effect on the crystalline state of carbon and Ni, as well as the size of Ni particles, further greatly affected the electromagnetic properties, especially the dielectric properties of the materials. Due to the combination of good impedance match and strong microwave attenuation ability, the Ni/C/CG composites prepared under a wide temperature range of 600−800 ℃ all displayed excellent microwave absorption performance. For the sample heat-treated at 800 ℃, the minimum reflection loss could reach −20.9 dB at 12.9 GHz and the corresponding effective absorption band was 3.7 GHz with a coating thickness of only 2 mm. In addition, the dielectric loss was the dominant microwave absorption mechanism, which mainly originated from the conductive loss caused by the graphite carbon and Ni particles, and the interfacial polarization loss due to the existence of interface between Ni, C and CG.
- coal gangue,
- carbon,
- nickel,
- microwave absorption

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References(27)

References

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