Design and fabrication of (Hf 0.25Zr 0.25Ta 0.25Nb 0.25)C–SiC ceramics with improved microwave absorbing properties via PDC route
Year: 2024
Type: article
Abstract: The development of advanced and efficient microwave-absorbing materials through the precise regulation of dielectric loss and impedance matching remains a significant challenge. In this study, (Hf0.25Zr0.25Ta0.25Nb0.25)C-SiC (HEC-SiC) biphasic ceramic powders were synthesized via a single-source-precursor route. The SiC content was systematically controlled by adjusting the amount of methyltrimethoxysilane. The resulting polymer-derived HEC-SiC composite exhibited a unique microstructure, with nano-sized SiC particles uniformly distributed throughout the HEC matrix. As a result, the HEC-SiC-2 composite, containing approximately 21.21 wt.% SiC, achieved a minimum reflection loss value (RLmin) of -54.28 dB at 12.39 GHz with a thickness of 3.14 mm. The superior microwave attenuation capability is attributed to optimized impedance matching, enhanced interfacial polarization between the HEC matrix and nano-sized SiC, and the dipole polarization induced by defects within the HEC. This study offers a novel strategy for the fabrication of high-entropy ceramic-SiC biphasic composites with excellent microwave absorbing properties, paving the way for application in electromagnetic interference shielding and stealth technologies.
Source: Journal of Advanced Ceramics
Authors: Bin Du, Saidi Wang, Linwei Guo, Yimin Ouyang, Hanwei Cheng, Yajuan Cheng, Tao Zhang
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,372
OpenAlex ID: W4404149704