Construction of Si3N4/SiO2/SiC–Y2Si2O7 composite ceramics with gradual impedance matching structure for high-temperature electromagnetic wave absorption
Construction of Si3N4/SiO2/SiC–Y2Si2O7 composite ceramics with gradual impedance matching structure for high-temperature electromagnetic wave absorption
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高温电磁波吸收渐变阻抗匹配结构Si3N4/SiO2/SiC·Y2Si2O7复合陶瓷的构建
DOI：
10.1016/j.ceramint.2022.04.298
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发表时间：
2022-04
影响因子：
5.2
通讯作者：
Qingyuan Wang
中科院分区：
文献类型：
--
作者：
Hanjun Wei;Shenquan Yang;Pei Feng;Jimei Xue;Feng Zhao;Qingyuan Wang
良好的阻抗匹配是提高电磁波吸收材料性能的关键。本文采用烧结和化学气相渗透（CVI）技术制备了Si 3 N4/SiO2/SiC-Y2 Si 2 O 7复相陶瓷。研究了复合陶瓷的微观结构与电磁波吸收特性之间的关系。结果发现，非晶Si 3 N4，SiO2和SiC层构造与渐进的阻抗匹配结构，这不仅提高了阻抗匹配，但也增加了纳米界面的数量。更重要的是，SiC纳米晶有效地增加了传导损耗，并且缺陷和纳米级异质界面的存在进一步增加了极化损耗。因此，所制备的复合陶瓷显示出增强的电磁波吸收性能，在25 °C（RT）-300 °C的温度范围内，最小反射系数（RCmin）值小于-20 dB，有效吸收带宽（EAB）保持在4.2 GHz，厚度范围为3.75-4.75 mm。这些结果表明，高性能的电磁波吸收材料，可应用于高温和水蒸气环境的实际意义。
Good impedance matching is vital in upgrading the performance of electromagnetic (EM) wave-absorbing materials. In this study, Si3N4/SiO2/SiC–Y2Si2O7composite ceramics were synthesized by sintering and chemical vapor infiltration (CVI) technology with gradual impedance matching. The relationship between the microstructure of the as-prepared composite ceramics and EM wave absorption characteristics was thoroughly explored. It was found that the amorphous Si3N4, SiO2, and SiC layers were constructed with a gradual impedance matching structure, which not only improved impedance matching but also increased the number of nano interfaces. More importantly, SiC nanocrystals effectively increased the conduction loss, and the presence of defects and nanoscale heterogeneous interfaces further increased the polarization loss. Consequently, the as-prepared composite ceramics displayed enhanced EM wave absorption properties, with a minimum reflection coefficient (RCmin) value of less than −20 dB over a temperature range of 25 °C (RT)-300 °C, and an effective absorption bandwidth (EAB) maintained at 4.2 GHz with the thickness range of 3.75–4.75 mm. These results demonstrated the practical significance of high-performance EM wave absorption materials that can be applied in high-temperature and water vapor environments.
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