目的 采用低电导的Mn元素对FeSiAl合金进行取代掺杂,达到提升合金磁导率并降低介电常数的目的,发展吸波性能优异的低频磁性吸波剂。方法 采用真空熔炼-气雾化法制备出Mn掺杂的Fe85Si9.6Al3.8Mn1.6球形合金微粉;采用搅磨工艺增大球形微粉的宽厚比以获得片状合金微粉;通过对片状合金微粉进行高温热处理获得有序相结构。采用SEM、XRD、XPS与综合热分析仪表征其微观形貌和物相结构变化,采用振动样品磁强计与矢量网络分析仪表征样品电磁性能。结果 对FeSiAl合金粒子而言,掺杂Mn元素后介电常数降低,同时复磁导率升高。在高温热处理下,Mn的掺杂对有序相的生成具有促进作用,使得磁导率进一步提升。当涂层厚度为2.5 mm时,掺杂Mn元素后的FeSiAlMn/石蜡基复合材料在整个0.1~8 GHz频段内都得到了显著提升,在1.2 GHz附近反射损耗的峰值为-12.8 dB。结论 采用低电导的Mn元素对FeSiAl合金进行取代掺杂,可有效地提升磁导率并降低介电常数。为进一步提升吸波性能,可通过调控热处理温度及氧分压,借助界面反应及氧扩散机制对合金粒子做选择性Fe氧化的表面处理。
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 Fe85Si9.6Al3.8Mn1.6 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.
关键词
FeSiAl系吸波剂 /
Mn掺杂 /
阻抗匹配 /
低频吸收
Key words
FeSiAl based absorbent /
Mn doping /
impedance matching /
low-frequency absorption
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基金
国家自然科学基金（52071239）; 湖北省重点研发项目（2024BAB113）
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