具有宽频电磁波吸收性能二氧化钛包覆羰基铁复合吸波材料的制备

苏强; 王涵群; 何云飞; 刘冬冬; 黄小萧; 钟博

doi:10.1007/s12613-023-2707-5

Volume 31 Issue 1

Jan. 2024

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 31(1): 197-205

Qiang Su, Hanqun Wang, Yunfei He, Dongdong Liu, Xiaoxiao Huang, and Bo Zhong, Preparation of CIP@TiO₂ composite with broadband electromagnetic wave absorption properties, Int. J. Miner. Metall. Mater., 31(2024), No. 1, pp. 197-205. https://doi.org/10.1007/s12613-023-2707-5

Cite this article as:

Qiang Su, Hanqun Wang, Yunfei He, Dongdong Liu, Xiaoxiao Huang, and Bo Zhong, Preparation of CIP@TiO2 composite with broadband electromagnetic wave absorption properties, Int. J. Miner. Metall. Mater., 31(2024), No. 1, pp. 197-205. https://doi.org/10.1007/s12613-023-2707-5

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研究论文

具有宽频电磁波吸收性能二氧化钛包覆羰基铁复合吸波材料的制备

1)
哈尔滨工业大学(威海)材料科学与工程学院，威海 264209，中国
2)
哈尔滨工业大学材料科学与工程学院，哈尔滨 150001，中国

通讯作者:
钟博 E-mail: zhongbo@hit.edu.cn

文章亮点

(1) 提出了通过钛酸异丙酯水解的方法制备二氧化钛包覆羰基铁（CIP@TiO₂）复合吸波材料；

(2) 钛酸异丙酯水解的方法制备的CIP@TiO₂具有优异的吸波性能，所制备的CIP@TiO₂最小反射损耗可达−46.07 dB，当其厚度为1.5 mm时，有效吸收带宽可达8 GHz；

(3) 相比未涂覆的羰基铁，CIP@TiO₂的氧化起始温度提高到了400℃左右，最大氧化速率温度提高到550℃左右。

中文摘要

电子设备的广泛应用所产生的电磁污染不仅影响敏感电气设备的正常运行，而且威胁着人体健康。电磁波吸收材料的应用可以有效地解决日常生产生活中的电磁污染问题。由于羰基铁在高频率下具有更高的饱和磁化强度和Snoek极限，使得其成为宽频吸收材料的理想材料之一。但是羰基铁的吸波应用也面临着一些局限性。例如，碳基铁的强氧化性导致其在高温环境中容易氧化，且其阻抗匹配差，往往导致阻抗失配，使电磁波无法有效进入羰基铁内部。在本文中，我们基于钛酸异丙酯的水解特性，提出了一种简单的二氧化钛包覆羰基铁（CIP@TiO₂）复合吸波材料的制备工艺。具体步骤为以钛酸异丙酯为钛源，在无水乙醇中实现了CIP@TiO₂的表面改性工艺，得到了CIP@TiO₂复合吸波材料。由于羰基铁包覆了二氧化钛，CIP@TiO₂复合吸波材料的介电参数显著降低，而其磁参数基本不变，这使得CIP@TiO₂的阻抗匹配明显提高。此外，羰基铁和二氧化钛之间的非均相界面极化进一步增强了CIP@TiO₂的电磁波吸收性能。电磁波吸收测试表明，CIP@TiO₂的最小反射损耗可达−46.07 dB，当其厚度为1.5 mm时，有效吸收带宽可达8 GHz。CIP@TiO₂的电磁波吸收性能在电磁波吸收强度、材料涂层厚度、有效吸收带宽等方面均有明显提高。在羰基铁表面涂覆二氧化钛后，CIP@TiO₂的氧化起始温度约为400℃，而未涂覆的羰基铁的氧化起始温度约为250℃。同时，CIP@TiO₂的最大氧化速率温度提高到550℃左右。

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Research Article

Preparation of CIP@TiO₂ composite with broadband electromagnetic wave absorption properties

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Abstract

Abstract

Scholars aim for the improved impedance matching (Z) of materials while maintaining their excellent wave absorption properties. Based on the hydrolysis characteristics of isopropyl titanate, a simple preparation process for the coating of carbonyl iron powder (CIP) with TiO₂ was designed. Given the TiO₂ coating, the Z of the CIP@TiO₂ composite was adjusted well by decreasing the dielectric constant. Moreover, the interfacial polarization of CIP@TiO₂ was enhanced. Ultimately, the electromagnetic-wave (EMW) absorption property of the CIP@TiO₂ composite was improved substantially, the minimum reflection loss reached −46.07 dB, and the effective absorption bandwidth can reach 8 GHz at the composite thickness of 1.5 mm. Moreover, compared with CIP, the oxidation resistance of CIP@TiO₂ showed remarkable improvement. The results revealed that the oxidation starting temperature of CIP@TiO₂ was about 400°C, whereas the uncoated CIP had an oxidation starting temperature of approximately 250°C. Moreover, the largest oxidation rate temperature of CIP@TiO₂ increased to around 550°C. This work opens up a novel strategy for the production of high-performance EMW absorbers via structural design.
- carbonyl iron@titanium dioxide;
- electromagnetic-wave absorption;
- impedance matching;
- oxidation resistance

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