多孔Al2O3/SiC、MoSi2/SiC复合材料的制备及吸波性能

doi:10.11949/0438-1157.20190444

摘要/Abstract

摘要：

以Si、Al₂O₃、MoSi₂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、MoSi₂/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：MoSi₂/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 dB。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；MoSi₂/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。

关键词: 复合材料, 包埋烧结, 介电损耗, 吸波性能

Abstract:

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, Mo_4.8Si₃C_0.6and 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.

Key words: composite, embedded sintering, dielectric loss, microwave absorbing performance

中图分类号:

TM 25

张路平, 杨晓凤, 郑海康, 王倩, 蒙真真, 武志红. 多孔Al₂O₃/SiC、MoSi₂/SiC复合材料的制备及吸波性能[J]. 化工学报, 2019, 70(11): 4478-4485.

Luping ZHANG, Xiaofeng YANG, Haikang ZHENG, Qian WANG, Zhenzhen MENG, Zhihong WU. Preparation and microwave absorbing performance of Al₂O₃/SiC, MoSi₂/SiC porous composites[J]. CIESC Journal, 2019, 70(11): 4478-4485.

图/表 6

图1 复合材料的XRD谱图

Fig.1 XRD patterns for surface of composites

图2 SiC及其复合材料的微观形貌和能谱

Fig.2 Micromorphology and energy spectrum of SiC and its composites

表1 材料的电导率

Table 1 Conductivity of materials

Number	Material	Conductivity/(S·cm^-1)
1	SiC	6.9×10^-3
2	Al₂O₃/SiC	6.0×10^-4
3	MoSi₂/SiC	7.5×10⁰

图3 样品的介电常数实部(ε′)和虚部(ε″)

Fig.3 Frequency dependence real part(ε′) and imaginary part(ε″) of dielectric constant of samples

图4 SiC及其复合材料的Cole-Cole图

Fig.4 Cole-Cole diagram of SiC and its composites

图5 SiC多孔材料、Al2O3/SiC复合材料和MoSi2/SiC复合材料在不同厚度、不同频率下的反射损耗；三种材料厚度为2 mm时的反射损耗；Al2O3/SiC和MoSi2/SiC复合材料的反射损耗三维图

Fig.5 Reflection loss at different thicknesses and frequency of SiC porous material, Al2O3/SiC composites and MoSi2/SiC composites; reflection loss when material thickness is 2 mm; 3D schematic diagram of reflection loss of Al2O3/SiC and MoSi2/SiC composites

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多孔Al₂O₃/SiC、MoSi₂/SiC复合材料的制备及吸波性能

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

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