Enhanced electromagnetic wave absorption properties of SiCN(Ni)/BN ceramics by in situ generated Ni and Ni3Si

Yanchun Tong; Chunmiao Liu; Chang Liu; Haibin Sun; Yurun Feng; Qiangqiang Hu; Hongying Zhang; Yujun Zhao; Xue Guo; Shigang Wu

doi:10.1039/d3ra07877a

Enhanced electromagnetic wave absorption properties of SiCN(Ni)/BN ceramics by in situ generated Ni and Ni₃Si

RSC Adv. 2024 Mar 11;14(12):8293-8302. doi: 10.1039/d3ra07877a. eCollection 2024 Mar 6.

Authors

Affiliations

¹ School of Materials Science and Engineering, Shandong University of Technology Zibo 255049 P. R. China guoxue@sdut.edu.cn wshgang@sdut.edu.cn.
² School of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences) Jinan 250353 China.

Abstract

In this paper, the SiCN(Ni)/BN ceramic with excellent electromagnetic wave (EMW) absorption performance was successfully prepared. The Ni and Ni₃Si were in situ formed by the introduction of nickel acetylacetonate (NA), which effectively improved the impedance matching performance of SiCN(Ni)/BN ceramics. The EMW absorption properties of the SiCN(Ni)/BN ceramics showed a trend of first increasing and then decreasing with the increase in content of NA. When the NA content reached 7 wt%, the impedance matching range of SiCN-7 was optimal. The minimum reflection loss (RL_min) of SiCN-7 reached -53.47 dB at 4.2 mm and the effective absorption bandwidth (EAB) was 2.32 GHz at 3.48 mm. Through the analysis of electrical conductivity, it was found that the proportion of polarization loss in dielectric loss was more than 99%. It is worth noting that the radar cross section (RCS) value of SiCN-7 absorber was lower than that of the perfect electrical conductor (PEC) plate in the range of -90-90°, and showed a larger coverage angle, indicating that it possessed a good practical application prospect in the field of electromagnetic wave absorption.