Zhong Cheng ¹, HOU Yongzhao ¹, YANG Wen ², ZHANG Lijuan ¹, WEN Guangwu ¹
(1. School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, Shandong, China; 2. School of Transportation and Verhicle Engineering, Shandong University of Technology, Zibo 255000, Shandong, China)

Abstract: A novel carbon rich SiOC ceramics fibres for microwave absorption were prepared with polysilylacetylene (PSA) as precursor. This lightweight SiOC ceramic fibers with a micro-level diameter are smooth in surface and pore-free. After heat treatment at 1200 ℃, multiple micro-nano phases generated in the SiOC matrix, including graphitized carbon, amorphous SiO₂ and nano-SiC. The as-prepared SiOC ceramic fibers possessed much more interface structures, with enhanced microwave-absorbing capacity. The minimum reflection loss (RLmin) of the SiOC absorber (30 wt.%) reached −43.4 dB, while the effective absorption bandwidth (RL<−10 dB) is 5.6 GHz at a thickness of 3.3 mm. These results prove that the SiOC ceramics fibre is a potential candidate for microwave absorption.
Key words: ceramic precursor; SiOC fibres; microwave absorption