Achievement of superior microwave absorption performance and ultra-wide regulation frequency range in Fe-Co-Nd via tuning the phase constitution and crystallinity
Achievement of superior microwave absorption performance and ultra-wide regulation frequency range in Fe-Co-Nd via tuning the phase constitution and crystallinity
复制标题
通过调节相组成和结晶度，实现 Fe-Co-Nd 优异的微波吸收性能和超宽调节频率范围
DOI：
10.1016/j.jmmm.2020.166561
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发表时间：
2020
影响因子：
2.7
通讯作者：
Zhang Yujing
中科院分区：
文献类型：
--
作者：
Peng Kangsen;Wu Yuhan;Liu Chuyang;Xiao Andong;Xu Guoyue;Fang Gang;Zhang Yanting;Cao Yufan;Zhang Yujing
为了在有限的厚度下实现优异的微波吸收和超宽调节频率范围，通过单辊熔融纺丝技术制备了(FeCo)100−xNdx(0≤x≤15)粉末。 Nd的引入降低了FeCo相的结晶度并促进了二次Nd2(FeCo)17相的形成，从而导致电磁（EM）参数明显降低。详细讨论了电磁参数和最终微波吸收特性之间的相关性。研究发现，抑制的电磁参数改变了阻抗匹配和衰减性能之间的协调，最终导致优异的微波吸收性能，在仅 1.45 mm 的厚度下具有 6.92 + GHz 的宽带宽和 RLminof -52.5 dB。此外，由于|μr|·|εr|的急剧下降测试结果显示，样品的合格RL覆盖了几乎所有测试频率（2-18GHz），且厚度仅为2mm，在涂层厚度有限的情况下，在全谱微波吸收区域显示出巨大的实用价值。
To achieve superior microwave absorption and ultra-wide regulation frequency range under a restricted thickness, (FeCo)100−xNdx(0 ≤ x ≤ 15) powders were prepared through a single roller melt spinning technique. The introduction of Nd decreases the crystallinity of FeCo phase and promotes the formation of secondary Nd2(FeCo)17phase, which results in apparent reduction of electromagnetic (EM) parameters. The correlations between EM parameters and final microwave absorption properties are discussed in detail. It is found that the suppressed EM parameters modifies the coordination between impedance matching and attenuation performance, ultimately leading to superior microwave absorption performance with broad bandwidth of 6.92 + GHz and RLminof −52.5 dB under thickness of only 1.45 mm. Moreover, due to the dramatic decline of |μr|·|εr| values, the qualified RL of the samples covers almost all the test frequency (2–18 GHz) with thin thickness of 2 mm, showing great practical value in full-spectrum microwave absorption area with a restricted coating thickness.