多壁碳纳米管对SiC/SiC陶瓷基复合材料吸波性能影响  

Influence of Multi-walled Carbon Nanotubes on Absorbing Properties of SiC/SiC Ceramic Matrix Composites

作　　者：王晓猛 马新 王岭 邱海鹏 梁艳媛 赵禹良 罗文东 贾伟 WANG Xiaomeng;MA Xin;WANG Lin;QIU Haipeng;LIANG Yanyuan;ZHAO Yuliang;LUO Wendong;JIA Wei(Composite Technology Center,AVIC Manufacturing Technology Institute,Beijing 101300,China)

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

出　　处：《陶瓷学报》2021年第5期807-812,共6页Journal of Ceramics

基　　金：国防基础科研计划(JCKYS2020213005);国家科技重大专项(2017-VI-0007-0076)。

摘　　要：为解决结构吸波陶瓷基复合材料的电性能通过纤维设计调控有限的问题,以多壁碳纳米管(MWCNT)颗粒为填料,将其均匀分散在液态聚碳硅烷先驱体中,通过先驱体浸渍裂解工艺(PIP)制备碳化硅(SiC)基吸波陶瓷基复合材料,研究纳米填料对基体介电性能及复合材料吸波性能的影响。结果表明,加入3 wt.%MWCNT能有效提高SiC基体的介电常数,使其具有一定的微波损耗能力。通过PIP工艺制备结构吸波陶瓷基复合材料发现,当含MWCNT陶瓷基体处于复合材料表面时,复合材料与自由空间阻抗匹配性降低,导致入射波在表面反射增加。当复合材料中间层基体含有MWCNT时,兼具良好的匹配和衰减特性,实现室温下在8 GHz-18 GHz具有<-6 dB的优异吸波性能。In order to address of limitation of the absorption performance of structural microwave-absorbing ceramic matrix composites through fiber design,multi-walled carbon nanotubes(MWCNT)were used as fillers that were dispersed uniformly in liquid polycarbosilane precursor.Silicon carbide(SiC)-based microwave absorbing ceramic matrix composites were prepared through precursor infiltration and pyrolysis(PIP).The influence of the nano-fillers on dielectric properties of the matrix and microwave absorbing properties of the composites was studied.It was found that 3 wt.%MWCNT could effectively increase dielectric constant of the SiC matrix and lead to strong microwave loss ability.However,the impedance matching between the composite material and the free space was reduced,resulting in an increase in the reflection of the incident wave on the surface.This problem was effectively solved by using an intermediate layer.Specifically,excellent absorbing performance,with reflection loss of<-6 dB in 8 GHz-18 GHz was achieved at room temperature.

关 键 词：碳纳米管 SiC/SiC陶瓷基复合材料 电性能 先驱体浸渍裂解 

分 类 号：TQ174.75[化学工程—陶瓷工业]