Simultaneously improved corrosion resistance and magnetic properties of a-Fe/Nd2Fe14B type nanocomposite magnets by interfacial modification
Simultaneously improved corrosion resistance and magnetic properties of a-Fe/Nd2Fe14B type nanocomposite magnets by interfacial modification
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通过界面改性同时提高a-Fe/Nd2Fe14B型纳米复合磁体的耐腐蚀性和磁性能
DOI：
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发表时间：
2018
影响因子：
6.2
通讯作者：
Li Cui
中科院分区：
文献类型：
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作者：
Wei Li;Hailing Li;Shengjie Zhu;Li Cui
纳米复合交换耦合磁体由于其潜在的高能量产物而最有可能成为下一代磁体。然而，它们的耐腐蚀性是一个严重的问题。纳米复合磁体的电化学行为在很大程度上是未知的。本文采用电化学方法研究了a-Fe/Nd_2Fe_（14）B型纳米复合永磁材料在3.5wt%NaCl溶液中的腐蚀行为。我们的研究结果表明，显微组织粗化。可以提高磁体的腐蚀性能，但它大大降低了磁性能。为了在不牺牲磁体磁性能的前提下提高磁体的抗腐蚀性能，通过控制快淬工艺或添加Nb元素，在α-Fe/Nd_2Fe_（14）B型纳米复合磁体的晶界引入了具有良好抗腐蚀性能的非晶相。具有界面非晶相的纳米复合磁体比没有界面非晶相的磁体具有更低的腐蚀电流密度（22.7mA/cm ~ 2）和更高的最大磁能积（23 MGOe）。这些结果表明，界面改性有利于提高合金的耐蚀性和磁性能。
Nanocomposite exchange coupled magnets are most likely the next-generation magnets because of their.potentially high energy products. However, their corrosion resistance is a serious concern. The electrochemical.behaviour of the nanocomposite magnets is largely unknown. In this study, we investigated the.corrosion behaviours of a-Fe/Nd2Fe14B type nanocomposite magnets in a 3.5 wt% NaCl solution at room.temperature using an electrochemical technique. Our results demonstrate that microstructure coarsening.can improve the corrosion performance of the magnets, but it greatly degrades the magnetic.properties. To enhance the corrosion resistance without scarifying the magnetic performance of the.magnets, an amorphous phase with good corrosion resistance is introduced to the grain boundary of a-.Fe/Nd2Fe14B type nanocomposite magnets by controlled melt-spinning process or adding Nb element..The nanocomposite magnets with an interfacial amorphous phase exhibit a lower corrosion current.density (22.7 mA/cm2) and higher maximum energy product (23 MGOe) than the magnets without an.interfacial amorphous phase. These results indicate that the interfacial modification is beneficial to the.improvement of both corrosion resistance and magnetic properties.