Preparation and electromagnetic wave absorption properties of SiC_NW-C_f/LAS composites

• Main Authors: DING Chu-heng, HOU Jia-bin, XIA Long, ZHANG Xin-yu, ZHONG Bo, ZHANG Tao
• Format: Article
• Language: zho
• Published: Journal of Materials Engineering 2020-05-01
• Series: Journal of Materials Engineering
• Subjects: sic_nw-c_f/las; different molar ratio of silicon to carbon; absorbing property; electromag-netic wave loss mechanism
• Online Access: http://jme.biam.ac.cn/CN/Y2020/V48/I5/41
• ISSN: 1001-4381; 1001-4381

SiC_NW were prepared with different molar ratio of silicon to carbon on carbon fiber cloth by thermal evaporation method using acetylene black as carbon source. SiC_NW-C_f/LAS(Li₂O-Al₂O₃-SiO₂) were prepared by using slurry-impregnation and vacuum sintering process with SiC_NW-C_f as intermediate interlayer. The results show that as the molar ratio of silicon to carbon decreasing, the diameter of SiC_NW decreases continuously, and the yield first increases and then decreases and reaches the highest when the molar ratio of silicon to carbon is 1:3. The SiC_NW-C_f/LAS prepared with a molar ratio of silicon to carbon of 1:1 has a minimum reflection loss of -40.9 dB (7 GHz, 3 mm) for electromagnetic wave. The SiC_NW-C_f/LAS prepared at a molar ratio of silicon to carbon of 1:3 has a maximum effective bandwidth for absorbing electromagnetic wave of 4.61 GHz (Ku band, 1.5 mm). The excellent absorbing properties of SiC_NW-C_f/LAS composites can be attributed to their higher dielectric loss and scattering loss for electromagnetic wave and adjustment of LAS to material and space impedance matching.