Coercivity enhancements of Nd–Fe–B sintered magnets by diffusing DyHx along different axes
Coercivity enhancements of Nd–Fe–B sintered magnets by diffusing DyHx along different axes
复制标题
通过沿不同轴扩散 DyHx 增强 Nd-Fe-B 烧结磁体的矫顽力
DOI：
10.1088/0022-3727/48/21/215001
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发表时间：
2015-04
期刊：
影响因子：
--
通讯作者：
Mi Yan
中科院分区：
文献类型：
--
作者：
Xuejiao Wang;Xiaolian Liu;Chen Wu;Mi Yan
在Nd2Fe14B型烧结磁体中沿晶界扩散重稀土元素是提高矫顽力和减小剩磁损失的有效方法。考虑到富NdGb相的织构各向异性，研究了DyHx微粉沿或垂直于 <；0 0 1 >； Easy轴(c轴)扩散时的矫顽力增量差。沿c轴扩散时，样品的矫顽力比垂直于c轴扩散时的快(18.85 kOe，比烧结态的高4.00 kOe)，分别为20.61 kOe(比烧结态高5.76 kOe)。显微组织研究表明，由于富ND相的各向异性分布，沿c轴处理时Dy比垂直处理时更容易向磁体内部扩散。在相同的扩散深度和更长的最终扩散距离下，Dy含量较高，证实了这一点。对于沿c轴处理的磁体，各向异性较强的局部Dy组分更丰富，从而导致更快的矫直力提高。研究表明，重稀土沿c轴扩散对提高取向NdFeB烧结磁体的矫顽力更为有效。
Diffusing heavy rare earth elements along the grain boundaries (GBs) for Nd2Fe14B-type sintered magnets serves as an effective method to enhance coercivity and to minimize remanence loss simultaneously. Considering the texture anisotropy of Nd-rich GB phases, the coercivity incremental difference by diffusing DyHx fine powders along or perpendicular to the <0 0 1 > easy axis (c-axis) has been investigated. The coercivity increases more rapidly to 20.61 kOe (5.76 kOe higher than that of the as-sintered state) when diffusing along the c-axis than that diffusing perpendicular to c-axis (18.85 kOe, 4.00 kOe higher than the as-sintered state). Microstructural investigation reveals that Dy diffuses more easily towards the magnet inner part when treating along the c-axis than that for the perpendicular case due to the anisotropic distribution of the Nd-rich phase. This is verified by a higher Dy content at equivalent diffusing depth and a much deeper final diffusion distance. The local Dy-containing fractions with a stronger anisotropy field are richer for the magnet treated along the c-axis, leading to the much rapider coercivity enhancement. This work reveals that diffusion heavy rare earth along the c-axis is more effective to enhance coercivity for aligned Nd–Fe–B sintered magnets.
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