期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 42, 期 10, 页码 4154-4161出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2022.03.058
关键词
SiC nanowires; EMW absorption performance; EMI shielding
资金
- National Natural Science Foundation of China [51902107, 51972114, 51772102]
- Natural Science Foundation of Guangdong Province [2019A1515011992]
- Guangdong YangFan Innovative & Entrepreneurial Research Team Program [2016YT03C327]
- Zhujiang Delta Water Resources Allocation Project [CD88-GC02-2020-0012]
SiCnws/CF composite materials were fabricated using in-situ growth method, and the SiCnw fraction could be adjusted by using different catalysts. At a small SiCnw fraction, the composites exhibited excellent EMW absorption performance, while they transformed into EMI shielding performance with the increase in SiCnw fraction. In addition, the SiCnws/CF composite materials had low density and excellent high-temperature stability, making them suitable for harsh environments.
Silicon-carbide nanowires (SiCnws) have been considered as dielectric loss materials for application in the field of electromagnetic wave (EMW) attenuation. In this study, SiCnws/carbon fiber (CF) composites were fabricated using precursor infiltration and pyrolysis process for the in-situ growth of SiCnws. The SiCnw fraction of the SiCnws/CF composites could be adjusted using various catalysts. At a small SiCnw fraction (38 wt%), the composites exhibited excellent EMW absorption performance with the minimum reflection loss of - 18.3 dB when their thickness was only 1.2 mm and can cover the entire X and Ku bands by adjusting the material thickness. They transformed from EMW absorption performance to electromagnetic interference (EMI) shielding property with the increase in SiCnw fraction from 38 wt% to 73 wt%, reaching an EMI shielding effectiveness of 31.25 dB. In addition, the density of the SiCnws/CF composites was only 0.31-0.41 g/cm3, and their compressive strength can reach 0.61-0.99 MPa with excellent high-temperature stability. Therefore, the SiCnws/CF composite presents a promising EMW absorption and EMI shielding material that can be applied in harsh environments.
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