Enhanced electromagnetic microwave absorption of SiC nanowire-reinforced PDC-SiC ceramics catalysed by rare earth. Issue 17 (1st September 2022)

• Record Type: Journal Article
• Authors: Feng, Pei; Wei, Hanjun; Shang, Peng; Shi, Yuhua; Wei, Xiaolong; Luo, Sihai; Liang, Xiaoqiang; Zhang, Wenyuan; Yu, Yaping; He, Weifeng
• Is Part Of: Ceramics international. Volume 48:Issue 17(2022)
• Page Start: 24915
• Page End: 24924
• Publication Date: 2022-09-01
• Subjects: SiCnws/SiC ceramics -- Rare earth Sc -- Microwave absorption properties; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.05.145
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Rare earth elements can modulate the dielectric constant of materials and significantly improve their dielectric properties. Herein, SiCnws/SiC ceramics were prepared through polymer derived ceramics (PDCs) technology with rare earth Sc particles as the catalyst. The Sc particles promote the precipitation of SiC and C from the matrix. Furthermore, the SiCnws, grown via the vapour-liquid-solid (VLS) mechanism, construct the three dimensional (3D) network structure to improve impedance matching and loss characteristics. Remarkably, the SiCnws/SiC ceramics minimum reflection coefficient (RCmin ) achieved a value of −33.2 dB at 9.4 GHz with a thickness of 2.75 mm, and the effective absorption bandwidth (EAB) was 4.2 GHz covering the whole X band. When microwaves permeated into the SiCnws/SiC ceramics, those trapped in the 3D network structure underwent a variety of microwave energy dissipation processes, including multiple reflections, scattering, and interface and dipole polarisation. Consequently, SiCnws-reinforced PDC-SiC ceramics catalysed by rare earth emerge as a promising new approach to enhance electromagnetic (EM) wave absorption performance.