SiC<sub>NW</sub>-C<sub>f</sub>/LAS复合材料的制备和电磁波吸收性能

doi:10.11868/j.issn.1001-4381.2018.001427

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摘要

采用热蒸发法，以乙炔黑为碳源，在碳纤维（C_f）布上制备不同摩尔硅碳比的SiC纳米线（SiC_NW）。通过浆料浸渍及真空烧结工艺，以不同摩尔硅碳比下制备的SiC_NW-C_f作为中间夹层制备SiC_NW-C_f/LAS（Li₂O-Al₂O₃-SiO₂）复合材料。结果表明：随着摩尔硅碳比的减小，SiC_NW的直径不断减小，产量先增加后减小，并在摩尔硅碳比为1：3时达到最高。摩尔硅碳比为1：1时，所制备的SiC_NW-C_f/LAS具有对电磁波的最低反射损耗-40.9 dB（7 GHz，3 mm）。摩尔硅碳比为1：3时，所制备的SiC_NW-C_f/LAS具有吸收电磁波的最大有效带宽4.61 GHz（Ku波段，1.5 mm）。SiC_NW-C_f/LAS复合材料优异的吸波性能归因于其对电磁波较高的介电损耗、散射损耗以及LAS对材料与空间阻抗匹配的调整。

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	丁楚珩
	侯甲彬
	夏龙
	张昕宇
	钟博
	张涛

关键词 ： SiC_NW-C_f/LAS, 不同摩尔硅碳比, 吸波性能, 电磁波损耗机理

Abstract：

SiC_NW were prepared with different molar ratio of silicon to carbon on carbon fiber cloth by thermal evaporation method using acetylene black as carbon source. SiC_NW-C_f/LAS(Li₂O-Al₂O₃-SiO₂) were prepared by using slurry-impregnation and vacuum sintering process with SiC_NW-C_f as intermediate interlayer. The results show that as the molar ratio of silicon to carbon decreasing, the diameter of SiC_NW decreases continuously, and the yield first increases and then decreases and reaches the highest when the molar ratio of silicon to carbon is 1:3. The SiC_NW-C_f/LAS prepared with a molar ratio of silicon to carbon of 1:1 has a minimum reflection loss of -40.9 dB (7 GHz, 3 mm) for electromagnetic wave. The SiC_NW-C_f/LAS prepared at a molar ratio of silicon to carbon of 1:3 has a maximum effective bandwidth for absorbing electromagnetic wave of 4.61 GHz (Ku band, 1.5 mm). The excellent absorbing properties of SiC_NW-C_f/LAS composites can be attributed to their higher dielectric loss and scattering loss for electromagnetic wave and adjustment of LAS to material and space impedance matching.

Key words： SiC_NW-C_f/LAS different molar ratio of silicon to carbon absorbing property electromag-netic wave loss mechanism

收稿日期: 2018-12-10 出版日期: 2020-05-28

中图分类号:

TB332

基金资助:国家自然科学基金项目(51372052);国家自然科学基金项目(51772060);国家自然科学基金项目(51302050)

通讯作者: 夏龙 E-mail: xialong@hit.edu.cn

作者简介: 夏龙(1978-), 男, 副教授, 博士, 从事专业:陶瓷基复合材料, 联系地址:山东省威海市环翠区文化西路2号哈尔滨工业大学(威海)材料学院(264209), E-mail:xialong@hit.edu.cn

引用本文:

丁楚珩, 侯甲彬, 夏龙, 张昕宇, 钟博, 张涛. SiC_NW-C_f/LAS复合材料的制备和电磁波吸收性能[J]. 材料工程, 2020, 48(5): 41-48.
Chu-heng DING, Jia-bin HOU, Long XIA, Xin-yu ZHANG, Bo ZHONG, Tao ZHANG. Preparation and electromagnetic wave absorption properties of SiC_NW-C_f/LAS composites. Journal of Materials Engineering, 2020, 48(5): 41-48.

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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2018.001427 或 http://jme.biam.ac.cn/CN/Y2020/V48/I5/41

Fig.1 不同摩尔硅碳比产物SiC_NW-C_f的XRD谱图(a)，拉曼光谱(b)以及摩尔硅碳比1:1时SiC_NW的TEM图(c)

Fig.2 C_f及不同摩尔硅碳比下制备的SiC_NW-C_f表面形貌
(a)碳纤维；(b)1:1；(c)1:2；(d)1:3；(e)1:4；(f)1:5

Fig.3 不同摩尔硅碳比下制备的SiC_NW-C_f/LAS复合材料复介电常数实部(a)及虚部(b)的变化

Fig.4 不同摩尔硅碳比烧结的SiC_NW-C_f/LAS复合材料的Cole-Cole圆
(a)1:1；(b)1:2；(c)1:3；(d)1:4；(e)1:5

Fig.5 LAS的复介电常数实部(a)，反射损耗曲线(b)及C_f/LAS的反射损耗曲线(c)

Fig.6 不同摩尔硅碳比烧结的SiC_NW-C_f/LAS复合材料的反射衰减图
(a)1:1；(b)1:2；(c)1:3；(d)1:4；(e)1:5

Fig.7 摩尔硅碳比为1:1的SiC_NW-C_f/LAS复合材料三维吸波图

Table 1 不同SiC_NW试样的EM吸波性能

Fig.8 SiC_NW-C_f/LAS复合材料的吸波机理图

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