Rear earth (Re: Sc, Y, and Ce) modified PDCs-SiC ceramics for efficient microwave

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.

Automated summary

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.