莫来石-SiBCN涂层的制备及其吸波性能研究  

Preparation and Wave Absorbing Performance of Mullite-SiBCN Coatings

作　　者：赵禹良 宋雨晴 马新 梁艳媛 黄浩 陈明伟 ZHAO Yu-Liang;SONG Yu-Qing;MA Xin;LIANG Yan-Yuan;HUANG Hao;CHEN Ming-Wei(National Composite Technology Center,AVIC Manufacturing Technology Institute,Beijing 101300;Beijing Graphene Institute,Beijing 100095)

机构地区：[1]中国航空制造技术研究院复合材料技术中心,北京101300 [2]北京石墨烯研究院,北京100095

出　　处：《现代技术陶瓷》2024年第3期259-267,共9页Advanced Ceramics

摘　　要：为提升单一组分聚合物转化SiBCN陶瓷材料的吸波性能,本文设计了莫来石为吸波基体、SiBCN为吸波剂的复合粉体体系。采用球磨法将二者均匀分散在水溶性树脂胶中,采用浆料刷涂法在环氧树脂平板表面制备了不同莫来石含量的莫来石-SiBCN吸波涂层。采用弓形法测试涂层的反射率,研究分析了莫来石含量对涂层吸波性能的影响。结果表明,随着莫来石添加量的增加,涂层吸波性能先提升后减弱,莫来石含量为70wt.%时,具有相对最佳的吸波性能,反射率优于-4dB的频率范围可达3.5GHz,其主要原因为是:当莫来石含量低于70wt.%时,涂层与自由空间阻抗匹配性能较差,涂层表面的入射波大部分被反射掉,无法实现有效吸收,而当莫来石含量高于70wt.%时,涂层中吸波剂含量过低导致涂层的微波损耗性能不足。The polymer derived SiBCN has excellent electromagnetic wave absorbing performance,but the impedance matching characteristics of single SiBCN component are poor.The composite powder system of Mullite matrix and SiBCN absorbing agent was designed.The powders was uniformly dispersed in the water-soluble resin glue by ball milling method,the Mullite-SiBCN absorbing coating with different mullite content was prepared on the surface of epoxy resin plate by slurry brushing method.The reflectivity of the coating was tested by the bow method,and the effect of mullite content on the absorbing performance of the coatings was studied.The results showed that the absorption performance of the coatings first increased and then decreased with the mullite content increased.When the content is 70wt.%,the absorption performance of the coating is relatively the best,The frequency range of reflection loss less than-4dB can reach 3.5GHz.When the mullite content is lower than 70wt.%,the matching performance between the coating and the free space impedance was poor,most of the incident waves on the coating surface were reflected,thus when the mullite content exceeded 70wt.%,the SiBCN content of the coating was too low,resulting in insufficient microwave absorbing performance of the coating.

关 键 词：莫来石-SiBCN 陶瓷吸波涂层 反射率 

分 类 号：TB332[一般工业技术—材料科学与工程]