摘要
以Si、Al2O3、Mo Si2微粉和生物竹材为原料,采用包埋烧结法分别制备出SiC 多孔材料、Al2O3/SiC 、Mo Si2/SiC 复合材料。采用XRD、SEM及波导法测试其物相组成、显微结构及吸波性能。结果表明:Mo Si2/SiC 复合材料的厚度为2 mm时有明显的吸波特性,有效吸收带宽在X波段的9.65-12.4 GHz频率范围内达2.75 GHz,且最低反射损耗为-38.27 d B。Al2O3/SiC 复合材料孔道内的Al2O3与SiC 晶须交缠,形成大量电偶极矩,产生介电损耗;Mo Si2/SiC 复合材料除介电损耗外还存在电阻损耗,使得复合材料电磁损耗增加,是较有前途的结构功能吸波材料。
Si,Al2O3,Mo Si2 powder and biological bamboo were used to produce SiC porous ceramic,Al2O3/SiC and Mo Si2/SiC porous composites by embedding and sintering method.The phase composition,microstructure and absorbing performance of the composites were measured by XRD,SEM and waveguide method,respectively.The results show that the Mo Si2/SiC composite has obvious absorbing performance when the thickness is 2 mm.The effective absorption bandwidth is 2.75 GHz in the frequency range of 9.65-12.4 GHz in the X-band,and the minimum reflection loss is-38.27 d B.There are many SiC whiskers intermingled with Al2O3in the pores of Al2O3/SiC composites,and a large number of electric dipole moments,generated dielectric loss.In addition to dielectric loss,Mo Si2/SiC composites also have resistive losses,and the sponge structure of the metal Mo,Mo4.8Si3C0.6and Mo Si2connecting rod formed in the tunnel constitutes a small conductive network to generate leakage loss to consume electromagnetic waves,so that the electromagnetic loss of the composite increases.So it will be more popular structural functional microwave absorbing materials in the future.
作者
张路平
杨晓凤
郑海康
王倩
蒙真真
武志红
ZHANG Luping;YANG Xiaofeng;ZHENG Haikang;WANG Qian;MENG Zhenzhen;WU Zhihong(College of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,Shaanxi,China;State Key Laboratory of Advance Refractories,Sinosteel Luoyang Institute of Refractories Research Co.,Ltd.,Luoyang 471039,Henan,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2019年第11期4478-4485,共8页
CIESC Journal
基金
国家自然科学基金项目(51502236)
西安建筑科技大学基础研究基金项目(JC1496)
先进耐火材料国家重点实验室开放基金项目(SKLAR201905)
关键词
复合材料
包埋烧结
介电损耗
吸波性能
composite
embedded sintering
dielectric loss
microwave absorbing performance
