Design of multilayer cauliflower-like structure SiO2/SiC–Y2Si2O7 composite ceramics as high-efficiency electromagnetic wave absorbers
Design of multilayer cauliflower-like structure SiO2/SiC–Y2Si2O7 composite ceramics as high-efficiency electromagnetic wave absorbers
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多层菜花状结构SiO2/SiC·Y2Si2O7复合陶瓷高效电磁波吸收体的设计
DOI：
10.1016/j.ceramint.2022.07.309
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发表时间：
2022-08
期刊：
影响因子：
--
通讯作者：
Qingyuan Wang
中科院分区：
文献类型：
--
作者：
Hanjun Wei;Jie Liu;Pei Feng;Shenquan Yang;Jimei Xue;Cunxian Wang;Feng Zhao;Qingyuan Wang
合理设计稀土硅酸盐复合材料的微观组织和相组成，可以提高其耐腐蚀性能和电磁性能。然而，单一的稀土硅酸盐不能满足新型电磁吸收材料的要求。本文采用溶胶-凝胶、无压烧结、化学气相渗透（CVI）和1100℃（1.5 h）氧化法制备了具有多层花椰菜状结构的新型sio2 /SiC - y2si2o7复合陶瓷。SiC增加了相对复介电常数和衰减能力，sio2层阻抗匹配介质有效地平衡了阻抗匹配性能。因此，sio2 / sic - y2si2o7复合陶瓷在整个X波段（4.2 GHz）表现出优异的电磁波吸收性能：反射系数最小值（RC min）为- 21.5 dB，覆盖层厚度为3.65 mm。这是由于阻抗匹配、极化损耗、电导率损耗和内部多次反射损耗造成的。总之，这项工作为实现稀土硅酸盐材料的EM隐身特性提供了一种策略。
A reasonable design of the microstructure and phase composition of rare earth silicate composites can enhance their corrosion resistance and their electromagnetic (EM) properties. However, individual rare earth silicates cannot fulfill the requisites for novel EM absorption materials. Herein, we introduce SiC and SiO 2 to establish novel SiO 2 /SiC–Y 2 Si 2 O 7 composite ceramics with a multilayer cauliflower-like structure using sol-gel, pressure-free sintering, chemical vapor infiltration (CVI) and oxidation at 1100 °C (1.5 h). SiC increases the relative complex permittivity and attenuation capabilities and the SiO 2 layer impedance matching mediator effectively balances the impedance matching properties. The SiO 2 /SiC–Y 2 Si 2 O 7 composite ceramics, therefore, exhibit superior EM wave absorption properties: the reflection coefficient minimum (RC min ) is −21.5 dB, with a 3.65 mm thick covering, in the whole X band (4.2 GHz). This is due to the impedance matching, polarization loss, conductivity loss, and internal multiple reflections loss. In brief, this work provides a strategy for achieving the EM stealth characteristics of rare earth silicate materials.
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