核-壳结构Al<sub>2</sub>O<sub>3</sub>@CIPs的制备及其抗氧化性能和吸波性能

doi:10.11868/j.issn.1001-4381.2021.000330

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采用球磨-原位氧化法制备出具有核-壳结构的Al₂O₃@CIPs复合材料。通过X射线衍射仪、热重分析仪、扫描电镜对Al₂O₃@CIPs的物相组成、质量变化和微观形貌进行分析，研究不同氧化温度对Al₂O₃@CIPs复合材料电磁性能和吸波性能的影响。结果表明：随着氧化温度的升高，Al₂O₃@CIPs的壳层出现不同程度的损坏，并伴有Fe氧化物的生成。其中，介电常数先增大后减小，而磁导率则降低。对比CIPs，经过400℃原位氧化获得的Al₂O₃@CIPs具有良好的吸波性能，对应的介电常数实部约为15，虚部为2.8~4.3。在X波段1.8 mm厚度下可获得3.4 GHz的有效吸收带宽（< -10 dB），而在450℃原位氧化得到的Al₂O₃@CIPs在11.1 GHz处获得最大的反射损耗，为-30 dB。

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	于明飞
	姚伦标
	卿玉长
	马莉娅

关键词 ：核-壳结构Al₂O₃@CIPs, 抗氧化性, 介电常数, 磁导率, 微波吸收

Abstract：

Core-shell Al₂O₃@carbonyl iron powders (CIPs) were prepared by ball-milling-in-situ oxidation method. The phase composition, mass change and micromorphology of Al₂O₃@CIPs were analyzed by X-ray diffraction, thermogravimetric analyzer and scanning electron microscopy. The effects of various oxidation temperature on electromagnetic properties and absorbing performance of Al₂O₃@CIPs were studied. The results show that, as the oxidation temperature increases, the shell of Al₂O₃@CIPs is damaged to some extent and accompanied by the formation of iron oxides, its permittivity rises first and then declines, while permeability shows a downward trend. Compared with CIPs, Al₂O₃@CIPs obtained by in-situ oxidation at 400℃ achieve excellent electromagnetic wave absorption performance.The real part of the permittivity is about 15, and the imaginary part is 2.8-4.3. The effective absorption band (< -10 dB) of 3.4 GHz can be obtained under the thickness of 1.8 mm in the X-band, while the Al₂O₃@CIPs obtained by in-situ oxidation at 450℃ achieve the maximum reflection loss of -30 dB at 11.1 GHz.

Key words： core-shell Al₂O₃@CIPs anti-oxidation property permittivity permeability microwave ab-sorption

收稿日期: 2021-04-10 出版日期: 2022-10-24

中图分类号:

V25

基金资助:西北工业大学凝固技术国家重点实验室基金(2020-TS-01)

作者简介: 卿玉长(1985—), 男, 副教授, 博士, 研究方向为功能陶瓷和薄膜, 联系地址: 陕西省西安市碑林区友谊西路127号西北工业大学材料科技大楼513(710072), E-mail: qingyuchang@nwpu.edu.cn

引用本文:

于明飞, 姚伦标, 卿玉长, 马莉娅. 核-壳结构Al₂O₃@CIPs的制备及其抗氧化性能和吸波性能[J]. 材料工程, 2022, 50(10): 111-117.
Mingfei YU, Lunbiao YAO, Yuchang QING, Liya MA. Preparation of core-shell Al₂O₃@CIPs and its anti-oxidation properties and microwave absorbing performance. Journal of Materials Engineering, 2022, 50(10): 111-117.

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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2021.000330 或 http://jme.biam.ac.cn/CN/Y2022/V50/I10/111

Fig.1 CIPs(a)、Al粉(b)和Al@CIPs(c)的SEM图

Fig.2 Al@CIPs在300(a)，350(b)，400 ℃(c)和450 ℃(d)下氧化2 h的SEM图

Fig.3 Al@CIPs在不同温度下氧化2 h与未氧化Al@CIPs的XRD谱图

Fig.4 CIPs与不同氧化温度的Al₂O₃@CIPs的热重曲线

Fig.5 CIPs与不同温度下氧化生成的Al₂O₃@CIPs样品的电磁参数
(a)介电常数；(b)磁导率；(1)实部；(2)虚部

Fig.6 CIPs与不同温度下原位氧化生成的Al₂O₃@CIPs在1.8 mm厚度下的反射损耗曲线

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