Magnetic and microstructural modification of the Nd–Fe–B sintered magnet by mixed DyF3/DyHx powder doping
Magnetic and microstructural modification of the Nd–Fe–B sintered magnet by mixed DyF3/DyHx powder doping
复制标题
DOI：
10.1063/1.4867965
复制
发表时间：
2014-03
影响因子：
3.2
通讯作者：
Tae Hoon Kim;S. Lee;Hyo Jun Kim;M. W. Lee;T. Jang
中科院分区：
文献类型：
--
作者：
Tae Hoon Kim;S. Lee;Hyo Jun Kim;M. W. Lee;T. Jang
研究了DyF 3、DyHx以及DyF 3和DyHx混合粉末掺杂的Nd-Fe-B烧结磁体的磁性能和显微结构。在DyHx掺杂的磁体中，Dy的扩散主要通过晶界扩散发生。然而，由于F−和H+离子的不同影响，Dy通过晶格扩散扩散的比例在DyF 3掺杂的磁体中增加。详细的微观结构变化的机制，在Dy的扩散行为引起的DyF 3和DyHx粉末掺杂进行了讨论。Dy偏析的富Nd氧化物相（富RE，Dy-Nd-O）的形成仅在DyF 3掺杂的磁体中被抑制，并且当烧结磁体中掺杂DyHx粉末时，Nd 2Fe 14 B晶粒的（00 L）排列增加。通过掺杂DyF_3和DyH_x粉末，获得了最佳的Nd-Fe-B烧结磁体的显微组织和磁性能，弥补了单独使用DyF_3和DyH_x粉末的缺点。
We investigated the magnetic and microstructural properties of Nd–Fe–B sintered magnets doped with DyF3, DyHx, and a mixture of DyF3 and DyHx powders. In the DyHx-doped magnet, diffusion of Dy occurs predominantly via grain boundary diffusion. However, the proportion of Dy being diffused by lattice diffusion is increased in the DyF3-doped magnet due to the different influences of F− and H+ ions. The detailed mechanism of the microstructural changes in terms of the diffusional behavior of Dy induced by the DyF3 and DyHx powder doping is discussed. The formation of a Dy-segregated Nd-rich oxide phase (RE-rich, Dy–Nd–O) was suppressed only in the DyF3-doped magnet, and the (00L) alignment of Nd2Fe14B grains in the sintered magnet increased when it was doped with the DyHx powder. We obtained the optimum microstructural and magnetic properties of the Nd–Fe–B sintered magnet through doping with a mixture of DyF3 and DyHx powders, which compensated for the drawbacks of using each powder alone.