Electromagnetic wave absorption superalloy/graphite magnetic nanocapsules applied in wide temperature range
Electromagnetic wave absorption superalloy/graphite magnetic nanocapsules applied in wide temperature range
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DOI：
10.1016/j.compositesb.2022.109692
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发表时间：
2022-01
期刊：
影响因子：
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通讯作者：
Z. Lei;S.Z. Li;A. Zhang;Y. Song;N. He;M.Z. Li;D. Geng;W. Liu;S. Ma;Z.D. Zhang
中科院分区：
文献类型：
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作者：
Z. Lei;S.Z. Li;A. Zhang;Y. Song;N. He;M.Z. Li;D. Geng;W. Liu;S. Ma;Z.D. Zhang
由软磁核和介电石墨壳组成的纳米磁性纳米胶囊在电磁波吸收材料方面具有重要意义。作为一种理想的模型体系，制备了新型纳米复合高温合金/石墨纳米碳管FeNi3@C，该合金在5 ~ 300 K范围内具有极稳定的磁行为，在719 K范围内具有较强的抗氧化能力。系统地研究了磁芯、填充率、介质壳层对电磁波吸收的调谐规律。当吸收体厚度为3 mm时，在13 GHz处的反射损耗（RL）为-47.26 dB，吸收带宽为7.04 GHz（RL <-10 dB），而有效吸收带宽保持在磁性纳米胶囊系统的最高水平。这项工作不仅扩展了磁性纳米胶囊在宽温度范围内的电磁波吸收应用，而且还提供了一个明确的最佳顺序，以支持材料设计策略，以实现最佳的电磁波吸收纳米复合系统。
The magnetic nanocapsules composed of soft-magnetic core and dielectric graphite shell in nanoscale are of great significance for electromagnetic wave (EMW) absorbing materials. As an ideal model system, novel nanocomposite superalloy/graphite FeNi3@C nanocapsules were synthesized that showed two significant advantages including extremely stable magnetic behavior from 5 K to 300 K and strong anti-oxidation ability up to 719 K, simultaneously. The tuning regularity of enhanced EMW absorption, including magnetic core, filling ratio, dielectric shell, was systemically investigated. A reflection loss (RL) - 47.26 dB at 13 GHz and an absorption bandwidth 7.04 GHz (RL < −10 dB) with absorber thicknesses 3 mm were obtained while the effective absorbing bandwidth remained at top level in magnetic nanocapsules system. This work not only extends EMW absorption application of magnetic nanocapsules in wide temperature range, but also provides a clear optimal sequence to support the material design strategy to achieve best EMW absorption in nanocomposite systems.