Multiscale SiCnw and carbon fiber reinforced SiOC ceramic with enhanced mechanical and microwave absorption properties

作者：Qian, Junjie; Du, Bin^*; He, Chao; Cai, Mei; Zhong, Xinrong; Xiong, Hao; Zeng, Shenghui; Shui, Anze^*

来源：Journal of the American Ceramic Society, 2022, 105(5): 3456-3468.

DOI：10.1111/jace.18338

• ceramic matrix composites
• compressive strength
• electromagnetic wave absorption
• hierarchical structure

The hierarchical SiOC/SiCnws/CF composites (A/B/C structure) were designed via precursor infiltration and pyrolysis process. The SiOC ceramics served as the wave-transparent characteristic materials to adjust the impedance matching. Herein, the in situ growth of SiCnws not only was used for the absorber but served as the reinforcement of SiOC matrix composites. In detail, the SiOC/SiCnws/CF-1200 degrees C-2 exhibits excellent electromagnetic absorption performance with minimum reflection loss of -46 dB at 14.4 GHz with the thickness of 1.6 mm, and its effective absorption band reaches 4.3 GHz. Its compressive strength reaches 8.69 and 16.41 MPa in z and x/y directions, separately. This contribution has a guidance for the application of carbon fiber/ceramics matrix composites in harsh environment.