Journal
MATERIALS CHARACTERIZATION
Volume 190, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2022.112048
Keywords
Re-SiC ceramics; Microstructure; Dielectric properties; Microwave absorption properties
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Funding
- National Natural Science Foundation of China [11672254, 51902257]
- Applied Basic Research Programs of Science and Technology Department of Sichuan Province [2020YJ0479]
- Chengdu University [2081922006]
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This study investigates the improvement of microwave absorption performance through material micromorphological design. The results show that Re-SiC ceramics prepared using PDCs methods, with the addition of rare earth elements (Sc, Y, Ce), exhibit enhanced microstructural, dielectric, and microwave absorption properties. Specifically, the Sc-SiC ceramics with a well-designed three-dimensional network structure demonstrate superior microwave absorption performance.
Material micromorphological design can effectively enhance electromagnetic properties, thus improving microwave absorption performance. In this paper, Re-SiC ceramics (Re: Sc, Y, Ce) were prepared using PDCs methods. The addition of various rare earth (Sc, Y, and Ce) produced improved microstructural, dielectric, and microwave absorption properties. The results indicate that Sc-SiC ceramic with an appropriately threedimensional (3D) network structure improves the impedance matching characteristic and dielectric loss, therefore obtaining superior microwave absorption performance. The Sc-SiC ceramic effective absorption bandwidth (EAB) is 3.2 GHz with a thickness of 2.9 mm, and the minimum reflection coefficient (RCmin) is-10.8 dB at the X band. This remarkable microwave absorption property is ascribed to the 3D structure, interface polarization, dipole polarization, conductance loss, multiple reflections, and microwave scattering. Consequently, PDCs-SiC ceramics with appropriate structural decoration can be prospective candidates for application in harsh environments.
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