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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