Microstructural and magnetic evolution of MnZn/FeSiAl composites synthesized by mechanochemistry |
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| Affiliation: | 1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2. National-Provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan 430081, China;3. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China;4. Guangdong Institute of Materials and Processing, Guangdong Academy of Sciences, Guangzhou 510650, China;5. National Engineering Research Center of Powder Metallurgy of Titanium & Rare Metals, Guangdong Academy of Sciences, Guangzhou 510650, China;6. Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Ministry of Education, Anhui University of Technology, Ma’anshan 243002, China;1. School of Chemistry and Materials Science, Ludong University, Yantai, 264025, PR China;2. Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, PR China;3. School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, PR China |
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| Abstract: | Spinel MnZn ferrites (MZFs) were synthesized by solid-state reaction via mechanochemical method. Microwave absorbing composites were fabricated with MZFs and FeSiAl powders. Microstructural evolutions and the influence of MZFs content on magnetic properties, shielding efficiency and reflection loss of composites were investigated. Sintering at 1200 °C, spinel MZFs can be synthesized. With increasing MZFs content, saturation magnetization decreased from 106.94 to 89.71 emu/g. For shielding efficiency and reflection loss, the optimal MZFs content is 10 wt%, the total shielding efficiency reaches to 45 dB. The bandwidth of reflection loss which exceeding −10dB reaches to 4.6 GHz. With increasing it to 15 wt%, the minimum reflection loss can reach to −16.5 dB, but the bandwidth narrowed. The attenuation coefficient decreased with increasing MZFs content. |
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| Keywords: | Spinel MnZn ferrite MnZn/FeSiAl composites Shielding efficiency Reflection loss Low-temperature sintering |
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