Dysprosium-saving improvement of coercivity in Nd-Fe-B sintered magnets by Dy2S3 additions
Dysprosium-saving improvement of coercivity in Nd-Fe-B sintered magnets by Dy2S3 additions
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DOI：
10.1063/1.3574444
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发表时间：
2011-04
影响因子：
3.2
通讯作者：
A. Gabay;M. Marinescu;W. Li;Jinfang Liu;G. Hadjipanayis
中科院分区：
文献类型：
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作者：
A. Gabay;M. Marinescu;W. Li;Jinfang Liu;G. Hadjipanayis
用Nd15.5(Fe，Co，Ga)78.2B6.3和Dy2S3混合粉末制备了掺镝烧结磁体，并与添加Dy2O3的磁体和单一(ND，Dy)-(Fe，Co，Ga)-B合金的磁体的组织和磁性能进行了比较。Dy2S3的加入使烧结磁体中的氧化钕相被Nd2O2S和Nd2O2S相取代。用Dy2S3和Dy2O3粉制备的磁体在(Nd2Dy)2Fe14B颗粒内的Dy分布不均匀，且具有富Dy的外晶区。然而，与添加Dy2O3的磁体和单一合金的晶界氧化相都是富Dy的不同，用Dy2S3制备的磁体的含硫晶界相中Dy的贫化。当可合金化的Dy原子比例较大时，用Dy2S3制备的磁体在每1at.%的Dy含量下具有最大的矫顽力增益。
Dysprosium-added sintered magnets were prepared from blends of Nd15.5(Fe,Co,Ga)78.2B6.3 and Dy2S3 powders; their microstructure and magnetic properties were compared to those of the magnets made with Dy2O3 additions or from single (Nd,Dy)-(Fe,Co,Ga)-B alloys. The addition of Dy2S3 leads to replacement of the neodymium oxide phases in the sintered magnets by the Nd2O2S and NdS phases. The magnets prepared with both the Dy2S3 and Dy2O3 powders exhibited inhomogeneous distribution of Dy within the (Nd,Dy)2Fe14B grains with Dy-rich outer grain regions. However, in a marked difference from the Dy2O3-added and single-alloy magnets, where the grain-boundary oxide phases were Dy-rich, the magnets prepared with Dy2S3 had their sulfur-containing grain-boundary phases depleted of Dy. With the larger fraction of Dy atoms available for alloying the main (Nd,Dy)2Fe14B phase, the magnets prepared with Dy2S3 showed the largest coercivity gain per 1 at.% of the added Dy.