Dielectric response and microwave absorption properties of SiCw/SiCf composites derived from carbon fiber

• Published in: Journal of materials science. Materials in electronics 2021, Vol.32 (1), p.442-452
• Main Authors: Mi, Yueshan, Chen, Yang, Zheng, Zhanshen, Li, Yuanliang, Qiao, Ning, Liang, Yuqi
• Format: Article
• Language: English
• Subjects: Aspect ratio; Carbon fibers; Ceramic fiber reinforced ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Core-shell structure; Dielectric properties; Heat treatment; Materials Science; Microwave absorption; Optical and Electronic Materials; Polarization; Silicon carbide; Stacking faults; Whisker composites
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-020-04792-8

The SiC w /SiC f composites composed by SiC whiskers with core–shell structure and SiC fiber with alike-array structure were prepared without growth catalyst, hydrogen silicone oil (H-PSO) as raw material, carbon fiber as the matrix. SiC fibers act as supports for a nanomesh containing interconnected one-dimensional SiC whiskers. The results of studying the absorption properties of the Ku band show that the density of stacking faults decreases and the aspect ratio increases as the heat treatment temperature increases and they jointly affect the dielectric properties of the SiC w /SiC f composites. The minimum reflection loss of the SiC w /SiC f composites obtained at 1400 °C can reach − 29.75 dB when the absorber thickness is 3.0 mm, and the effective bandwidth is 2.25 GHz. The polarization relaxation and interfacial polarization in the unique structure improve the microwave absorption properties and broaden the absorption frequency.