Hollow SiC foam with a double interconnected network for superior microwave absorption ability

• Published in: Journal of alloys and compounds 2020-03, Vol.817, p.153276, Article 153276
• Main Authors: Ye, Xinli, Chen, Zhaofeng, Li, Min, Wang, Ting, Wu, Cao, Zhang, Junxiong, Zhou, Qianbo, Liu, Hezhou, Cui, Sheng
• Format: Article
• Language: English
• Subjects: Chemical vapor deposition; Electromagnetic absorption; High temperature; Mechanical property; Microwave absorbers; Microwave absorption; Microwave absorption performance; Organic chemistry; Oxidation; Porous materials; SiC foam
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2019.153276

For high-efficiency microwave absorber, it is wise to integrate the porous structure and SiC material. In this work, the hollow SiC foam with a double interconnected network is proposed via a simple chemical vapor deposition and direct oxidation process. The SiC film imparts the foam with excellent mechanical property and microwave absorption performance. As a result, the fabricated SiC foam possesses a superior compressive response of 1.409 MPa at 17.51% strain, which is much higher than the original C foam or SiC reinforced C foam. Besides, SiC foam shows a minimum reflection loss value of −50.75 dB at 4.85 mm at 6.00 GHz. The effective bandwidth frequency and electromagnetic absorption efficiency also prove the superiority of the hollow porous architecture at the specified thickness, followed by a simple interpretation of the microwave absorbing mechanism. Given the excellent characteristics, the SiC foam has the enormous applied potential as a lightweight absorber in complex microwave absorbing conditions, especially for high temperature applications. [Display omitted] •We introduced a simple method to prepare the hollow SiC foam with a double interconnected network.•The fabricated SiC foam possesses a superior compressive response of 1.409 MPa at 17.51 % strain.•The SiC foam shows a minimum reflection loss value of −50.75 dB at 4.85 mm at 6.00 GHz.•The electromagnetic absorption efficiency proves the superiority of the SiC foam.•The SiC foam has the enormous applied potential as a lightweight absorber in complex conditions.