Dual-functional SiOC ceramics coating modified carbon fibers with enhanced microwave absorption performance. Issue 53 (27th September 2019)

• Record Type: Journal Article
• Authors: Zeng, Sifan; Feng, Wanlin; Peng, Shuyuan; Teng, Zhen; Chen, Chen; Zhang, Haibin; Peng, Shuming
• Is Part Of: RSC advances. Volume 9:Issue 53(2019)
• Page Start: 30685
• Page End: 30692
• Publication Date: 2019-09-27
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c9ra06166e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The SiOC ceramics coating modified carbon fibers improved anti-oxidation and refine microwave absorption properties. Abstract : Multi-functional carbon fiber (CF) based composites have great potential as new-type microwave absorption materials (MAMs). However, it was still a huge challenge to integrate antioxidation and MA properties into CF based composites. Herein, the SiOC ceramics coating modified carbon fibers (SiOC/CFs) were prepared by a polymer precursor pyrolysis method. The X-ray photoelectron spectroscopy (XPS) revealed that the SiOC coating was composed of SiOC, SiO2, and amorphous carbon phases. The SiOC ceramics as dual-functional coating not only heightened the oxidation temperature from 415 °C to 890 °C, but also highly improved the microwave absorbing ability from −12.60 dB to −47.50 dB. The enhanced MA performance could be attributed to multiple reflections in the cross-linked structure, various polarization relaxation processes, and the favorable impedance matching effect. The SiOC ceramics coating as a semiconductor could suppress the skin effect originating from the cross-linked CF network, thus leading to a favorable impedance matching behavior.