Preparation of Mn-doped Sendust Alloy Microwave Absorbent and Regulation of Its Magnetodielectric Properties

LUO Yunhao; WANG Chi; ZHAO Junfeng; LYU Peng; SUN Yize; HU Yuchen; CHEN Zhihong

doi:10.19554/j.cnki.1001-3563.2025.15.032

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Packaging Engineering ›› 2025, Vol. 46 ›› Issue (15) : 277-287. DOI: 10.19554/j.cnki.1001-3563.2025.15.032

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Preparation of Mn-doped Sendust Alloy Microwave Absorbent and Regulation of Its Magnetodielectric Properties

LUO Yunhao, WANG Chi, ZHAO Junfeng, LYU Peng^*, SUN Yize, HU Yuchen, CHEN Zhihong^*

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Abstract

The work aims to replace the FeSiAl alloy with low conductivity Mn elements, so as to improve the magnetic permeability of the alloy and reduce the dielectric constant, and develop a low frequency magnetic absorbent with excellent absorption properties. Mn doped Fe₈₅Si_9.6Al_3.8Mn_1.6 spherical alloy micro powder was prepared by vacuum melting atomization method; The stirring and grinding process was used to increase the width to thickness ratio of spherical micro powder to obtain sheet-like alloy micro powder; An ordered phase structure was obtained by high-temperature heat treatment of flake alloy micro powder. The changes in the microstructure were characterized using SEM, XRD, XPS, and comprehensive thermal analysis instruments, while the electromagnetic properties of the samples were characterized using a vibrating sample magnetometer and a vector network analyzer. For FeSiAl alloy particles, doping with Mn element led to a decrease in dielectric constant and an increase in complex magnetic permeability. Under high-temperature heat treatment, the doping of Mn promoted the formation of ordered phases, resulting in further enhancement of magnetic permeability. When the coating thickness was 2.5 mm, the FeSiAlMn/paraffin based composite doped with Mn element showed significant improvement in the entire frequency range of 0.1-8 GHz, with a peak reflection loss of -12.8 dB near 1.2 GHz. Substituting low conductivity Mn element for doping FeSiAl alloy can effectively improve magnetic permeability and reduce dielectric constant. To further enhance the absorption property, selective Fe oxidation surface treatment of alloy particles can be achieved by adjusting the heat treatment temperature and oxygen partial pressure, and utilizing interface reactions and oxygen diffusion mechanisms.

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FeSiAl based absorbent / Mn doping / impedance matching / low-frequency absorption

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LUO Yunhao, WANG Chi, ZHAO Junfeng, LYU Peng, SUN Yize, HU Yuchen, CHEN Zhihong. Preparation of Mn-doped Sendust Alloy Microwave Absorbent and Regulation of Its Magnetodielectric Properties[J]. Packaging Engineering. 2025, 46(15): 277-287 https://doi.org/10.19554/j.cnki.1001-3563.2025.15.032

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