Electromagnetic Property Modulation of Flaky Ferromagnetic 304 Stainless-Steel Powders for Microwave Absorption at Elevated Temperatures

IF 2.6 4区 化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR Magnetochemistry Pub Date : 2023-09-05 DOI:10.3390/magnetochemistry9090208
Bolin Yang, Yifan Xu, Zhihong Chen, Hang Yang, Yuchen Hu, Haoqin Wu, Mingfeng Xing, Jianguo Guan, Wei Li
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Abstract

Soft magnetic metallic absorbents suffer from severe oxidation, reduction in permeability and deterioration in microwave absorption when exposed to high temperatures. In this study, we prepared flaky 304 stainless-steel powders as new microwave absorbents via deformation-induced ferromagnetism. The 304 stainless-steel powders showed significant increases in saturation magnetization (Ms) from 1.03 to 82.46 emu/g when their shape was changed from spheroids to flakes; the Ms further increased to 92.29 emu/g after heat treatment at 500 °C in air. The permeability of 304 alloy powders also showed an obvious increase after ball milling and remained roughly stable after heat treatment at 500 °C in air. Moreover, the permittivity exhibited a sharp decrease after heat treatment, enabling the improvement of impedance matching and microwave absorption. After heat treatment at 500 °C in air for 100 h, the simulated reflection loss of 304 stainless-steel powders with wax still showed attractive levels, giving a minimum value of −22 dB and remaining below −6 dB over 8.5–16.5 GHz at a thickness of 2 mm. Our work can help to include paramagnetic alloy systems as new microwave absorbents for working in harsh environments.
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片状铁磁304不锈钢高温微波吸收粉末的电磁特性调制
软磁性金属吸附剂在高温下会发生严重的氧化、磁导率降低和微波吸收性能下降。本研究采用变形诱导铁磁法制备片状304不锈钢粉末作为新型微波吸收剂。304不锈钢粉末由球状变为片状时,饱和磁化强度(Ms)由1.03增加到82.46 emu/g;500℃空气热处理后,Ms进一步提高到92.29 emu/g。304合金粉末经球磨后渗透率也有明显提高,500℃空气热处理后渗透率基本保持稳定。热处理后的介电常数显著降低,提高了材料的阻抗匹配性能和微波吸收性能。在500℃空气中热处理100 h后,304不锈钢蜡粉的模拟反射损失仍然显示出吸引人的水平,在8.5-16.5 GHz范围内,在厚度为2mm的情况下,最小值为- 22 dB,保持在- 6 dB以下。我们的工作有助于将顺磁合金系统作为在恶劣环境下工作的新型微波吸收剂。
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来源期刊
Magnetochemistry
Magnetochemistry Chemistry-Chemistry (miscellaneous)
CiteScore
3.90
自引率
11.10%
发文量
145
审稿时长
11 weeks
期刊介绍: Magnetochemistry (ISSN 2312-7481) is a unique international, scientific open access journal on molecular magnetism, the relationship between chemical structure and magnetism and magnetic materials. Magnetochemistry publishes research articles, short communications and reviews. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.
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