Preparation and electromagnetic properties of Fe80.7Si4B13Cu2.3 nanocrystalline alloy powders for electromagnetic wave absorbers in X-band
Preparation and electromagnetic properties of Fe80.7Si4B13Cu2.3 nanocrystalline alloy powders for electromagnetic wave absorbers in X-band
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X波段电磁波吸收体Fe80.7Si4B13Cu2.3纳米晶合金粉末的制备及电磁性能
DOI：
10.1016/j.jmmm.2019.165988
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发表时间：
2020-03
影响因子：
2.7
通讯作者：
Wei Zhang
中科院分区：
文献类型：
--
作者：
Chunxuan Zhang;Yanhui Li;Yuping Duan;Wei Zhang
采用球磨法成功合成了fe80.7 si4b13cu2.3纳米晶软磁合金粉末，该粉末在x波段（8-12 GHz）具有优异的电磁波吸收性能。随着磨矿时间从40 h增加到160 h， bcc-Fe纳米晶/非晶复合结构近球形粉末的平均粒径从9 μm减小到6 μm，平均粒径稳定在10 nm左右。合金粉末具有较高的饱和磁化强度，达到178.2 ~ 183.4 emu/g。在2 GHz频率下，合金粉末/石蜡（质量比为3:1）复合材料的实磁导率和介电常数分别为2.18 ~ 2.42和7.3 ~ 9.7，在12.5 GHz频率附近的虚磁导率为0.68 ~ 0.77。厚度为2.1 ~ 2.3 mm的复合材料在x波段的有效吸收带宽（RL < ~ 10 dB）为4.5 ~ 5.0 GHz，反射损耗（RL < ~ 10 dB）为−39.1 ~−50.5 dB。优异的吸收性能得益于纳米晶合金粉末在GHz范围内的高磁导率和匹配的介电常数。
Fe80.7Si4B13Cu2.3nanocrystalline soft magnetic alloy powders with outstanding electromagnetic wave absorption properties in X-band (8–12 GHz) have been successfully synthesized by a ball-milling method. As milling time increases from 40 to 160 h, the mean particle size of the near spherical powders with a bcc-Fe nanocrystalline/amorphous composite structure decreases from 9 to 6 μm, while the average nanocrystalline grain size stabilizes at around 10 nm. The alloy powders possess high saturation magnetization of 178.2–183.4 emu/g. The alloy powders/paraffin (3:1 in mass ratio) composites exhibit real permeability and permittivity of 2.18–2.42 and 7.3–9.7 at 2 GHz, respectively, and imaginary permeability of 0.68–0.77 at resonance frequencies of around 12.5 GHz. The composites with thicknesses of 2.1–2.3 mm exhibit large reflection losses (RL) of −39.1 to −50.5 dB with effective absorption bandwidths (RL < −10 dB) of 4.5–5.0 GHz covering the X-band. The excellent absorption properties are benefited from the high permeability and matchable permittivity of the nanocrystalline alloy powders in GHz range.
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作者：
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