Influence of Cr content on structure and magnetic properties of Fe-Si-Al-Cr powders |
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Authors: | TD Zhou JK Tang |
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Institution: | a Key Laboratory of Special Material and Preparing Technology, Xihua University, Chengdu 610039, China b State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China |
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Abstract: | As a kind of soft magnetic metallic material, flaky FeSiAl powders have been studied and used widely. Transition metal chromium can improve the magnetic properties of FeSiAl. This article prepared Fe85Si9.5-xAl5.5Crx (x=0, 2, 4, 6 wt%) alloys powders by adding chromium to replace silicon in alloys. The morphology and microstructure of alloys powders were studied, electromagnetic parameters were measured and microwave absorption properties in the frequency range from 0.5 to 18 GHz were analyzed. With the increase of Cr content, α-Fe (Al, Si) superlattice phases appeared in alloys powders, and then disappeared. Excessive Cr precipitated from the alloys when its content reaches 6 wt%. The minimum reflection loss (-20 dB) among the four powders was 2 wt% Cr content at the frequency of 11.5 GHz. The peaks of reflection loss shifted to the low frequency range with increase in Cr content. |
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Keywords: | Superlattice Magnetic properties Mechanical alloying |
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