Abstract
A novel model with low–high–low permittivity hierarchical architecture was designed for high-temperature electromagnetic wave (EM) absorption. Si3N4–SiC/SiO2 composite ceramic was fabricated to verify this model. Dielectric properties of Si3N4–SiC/SiO2 in X-band from 25 to 600 °C were investigated. Due to the special designed structure, the effective permittivity of Si3N4–SiC/SiO2 increases slightly with rising temperature. When the temperature increases from 25 to 600 °C, average \( \varepsilon^{\prime} \) in X-band increases from 5.6 to 6.1, and \( \varepsilon^{\prime\prime} \) increases from 3.0 to 3.8. Because of the weak temperature dependence of effective permittivity, Si3N4–SiC/SiO2 exhibits good coordination between room temperature EM absorption and high-temperature EM absorption. Minimum reflection coefficient (RC) of Si3N4–SiC/SiO2 at room temperature reaches −38.6 dB with the sample thickness of 3.2 mm. At 500 and 600 °C, minimum RC of Si3N4–SiC/SiO2 with certain sample thickness reaches −51.9 and −35.9 dB, respectively. Meanwhile, the effective bandwidth reaches 4.16 and 4.02 GHz, which indicates the promising prospect of Si3N4–SiC/SiO2 for high-temperature EM absorption.
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Acknowledgements
This work is supported by the Natural Science Foundation of China (Grant: 51332004 and 51221001), the Fundamental Research Funds for the Central Universities (No.3102014JC02010403), the Program for New Century Excellent Talents in University (NCET-08-0461), and the 111 Project (B08040).
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Li, M., Yin, X., Zheng, G. et al. High-temperature dielectric and microwave absorption properties of Si3N4–SiC/SiO2 composite ceramics. J Mater Sci 50, 1478–1487 (2015). https://doi.org/10.1007/s10853-014-8709-y
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DOI: https://doi.org/10.1007/s10853-014-8709-y