Preparation and microwave absorbing performance of Al2O3/SiC, MoSi2/SiC porous composites

被引：0

作者：

Zhang L. ^{[1
]}

Yang X. ^{[1
]}

Zheng H. ^{[1
]}

Wang Q. ^{[1
]}

Meng Z. ^{[1
]}

Wu Z. ^{[1
,2
]}

机构：

[1] College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, Shaanxi

[2] State Key Laboratory of Advance Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang, 471039, Henan

来源：

Huagong Xuebao/CIESC Journal | 2019年 / 70卷 / 11期

关键词：

Composite; Dielectric loss; Embedded sintering; Microwave absorbing performance;

D O I：

10.11949/0438-1157.20190444

中图分类号：

学科分类号：

摘要：

Si, Al2O3, MoSi2 powder and biological bamboo were used to produce SiC porous ceramic, Al2O3/SiC and MoSi2/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 MoSi2/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 dB. There are many SiC whiskers intermingled with Al2O3 in the pores of Al2O3/SiC composites, and a large number of electric dipole moments, generated dielectric loss. In addition to dielectric loss, MoSi2/SiC composites also have resistive losses, and the sponge structure of the metal Mo, Mo4.8Si3C0.6 and MoSi2 connecting 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. © All Right Reserved.

引用

页码：4478 / 4485

页数：7

共 30 条

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