TY - JOUR
T1 - Enhanced electromagnetic microwave absorption of SiC nanowire-reinforced PDC-SiC ceramics catalysed by rare earth
AU - Feng, Pei
AU - Wei, Hanjun
AU - Shang, Peng
AU - Shi, Yuhua
AU - Wei, Xiaolong
AU - Luo, Sihai
AU - Liang, Xiaoqiang
AU - Zhang, Wenyuan
AU - Yu, Yaping
AU - He, Weifeng
N1 - Publisher Copyright:
© 2022 Elsevier Ltd and Techna Group S.r.l.
PY - 2022/9/1
Y1 - 2022/9/1
N2 - 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.
AB - 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.
KW - Microwave absorption properties
KW - Rare earth Sc
KW - SiCnws/SiC ceramics
UR - http://www.scopus.com/inward/record.url?scp=85130397838&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2022.05.145
DO - 10.1016/j.ceramint.2022.05.145
M3 - 文章
AN - SCOPUS:85130397838
SN - 0272-8842
VL - 48
SP - 24915
EP - 24924
JO - Ceramics International
JF - Ceramics International
IS - 17
ER -