Development of an alternative approach for electromagnetic wave absorbers using Fe-Cr-Co alloy powders
Development of an alternative approach for electromagnetic wave absorbers using Fe-Cr-Co alloy powders
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DOI：
10.1016/j.jallcom.2022.163920
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发表时间：
2022-01-29
影响因子：
6.2
通讯作者：
Sugimoto, Satoshi
中科院分区：
文献类型：
--
作者：
Ajia, Saijian;Asa, Hirotaka;Sugimoto, Satoshi
研究了Fe-Cr-Co磁性合金作为微波吸收材料的另一种应用。Fe-25 Cr-12 Co合金粉末在655 ℃的起始温度下进行亚稳分解，随后进行分级时效和随后控制冷却至各种最终时效温度。扫描透射电子显微镜分析的步进老化的样品证实了发生spinodal分解。制备了每种分步老化Fe-25 Cr-12 Co粉末与树脂混合的复合样品，以评估其在千兆赫（GHz）频段的微波吸收性能。我们发现，复合材料的复磁导率的虚部可以通过调节最终老化温度来调节。随着最终老化温度降至500摄氏度，峰值从0.3 GHz移至3.3 GHz，在1.6 GHz时最小反射损耗为-20dB。峰位移归因于Fe-25 Cr-12 Co合金粉末的调幅分解导致富Cr相包围富FeCo相，从而导致富FeCo相颗粒的磁化旋转。铁磁性富FeCo相颗粒的单畴结构是通过富FeCo相和富Cr相之间的组成差异的增加而产生的，这是由以5 ℃/h的速率受控冷却至500 ℃并在500 ℃下保持10 h引起的。这一令人鼓舞的发现表明了Fe-Cr-Co材料在GHz频率范围内微波吸收应用的潜在优势。(c)2022 Elsevier B. V.保留所有权利。
An alternative application of Fe-Cr-Co magnetic alloys as microwave absorption materials was investigated. Fe-25Cr-12Co alloy powder was spinodally decomposed at a starting temperature of 655 degrees C, followed by step aging and subsequent controlled cooling to various final aging temperatures. Scanning transmission electron microscopy analysis of the step-aged samples confirmed the occurrence of spinodal decomposi-tion. Composite samples of each step-aged Fe-25Cr-12Co powder mixed with resin were prepared to evaluate their microwave absorption properties in the gigahertz (GHz) band. We found that the imaginary component of the complex permeability for the composites could be tuned by adjusting the final aging temperature. The peak shifted from 0.3 to 3.3 GHz as the final aging temperature was reduced to 500 degrees C, with a minimum reflection loss of - 20 dB at 1.6 GHz. The peak shifting was ascribed to the magnetization rotation of single-domain structured ferromagnetic FeCo-rich phase particles, which was induced by the spinodal decomposition of the Fe-25Cr-12Co alloy powder to afford an FeCo-rich phase surrounded by a Cr-rich phase. The single-domain structure of the ferromagnetic FeCo-rich phase particles was generated by an increase in the compositional difference between the FeCo-rich and Cr-rich phases, which arose from controlled cooling to 500 degrees C at a rate of 5 degrees C/h and holding at 500 degrees C for 10 h. This promising finding demonstrates the potential advantages of Fe-Cr-Co materials for microwave absorption applications in the GHz frequency range. (c) 2022 Elsevier B.V. All rights reserved.