Controllable phase transformation for enhancing electromagnetic wave attenuation in the SiBCN polymer-derived ceramics

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-06-03 DOI:10.1016/j.jallcom.2025.181401

Pingan Chen, Tao Peng, Quan Yang, Yingli Zhu, Fu Chen, Mengke Qiao, Xiangcheng Li

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引用次数: 0

Abstract

Strong attenuation capability and good impedance matching are necessary conditions for high-performance electromagnetic wave (EMW) attenuation materials, which are difficult to balance in the polymer-derived ceramics (PDCs) preparation process. In this work, the dielectric loss phase and wave-transparent phase are simultaneously obtained in SiBCN ceramics, endowing a strong EMW absorbing capability. The results show that the transformation of Si₃N₄ to SiC could be controlled to achieve coexistence in SiBCN ceramics. The Si₃N₄ improves the impedance matching characteristics, while SiC and the corresponding heterogeneous interfaces enhance the polarization loss capability. Furthermore, the graphite strips construct a three-dimensional conductive network to improve the conductive loss capability. As a result, the minimum reflection loss reaches −54.24 dB at 15.04 GHz, and the effective absorption bandwidth is 7.48 GHz with a thickness of 1.72 mm, covering the whole Ku band. The excellent EMW absorption capability of SiBCN ceramics can be attributed to the synergistic function of Si₃N₄ and SiC, which provides a novel strategy for the preparation of ultra-thin and strong EMW attenuating materials with broadband.

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SiBCN聚合物衍生陶瓷中增强电磁波衰减的可控相变

强衰减能力和良好的阻抗匹配是高性能电磁波衰减材料的必要条件，这是聚合物衍生陶瓷（PDCs）制备过程中难以平衡的问题。在这项工作中，在SiBCN陶瓷中同时获得了介质损耗相和波透明相，赋予了强大的EMW吸收能力。结果表明，Si3N4向SiC的转变是可控的，可以在SiBCN陶瓷中实现共存。Si3N4改善了阻抗匹配特性，而SiC和相应的非均质界面增强了极化损耗能力。此外，石墨条构建了三维导电网络，提高了导电损耗能力。在15.04 GHz处，反射损耗最小达到-54.24 dB，有效吸收带宽为7.48 GHz，厚度为1.72 mm，覆盖了整个Ku波段。SiBCN陶瓷优异的EMW吸收性能可归因于Si3N4和SiC的协同作用，这为制备超薄强宽带EMW衰减材料提供了新的策略。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.