Effect of high magnetic field on the coercivity in sintered Nd-Fe-B magnets
Effect of high magnetic field on the coercivity in sintered Nd-Fe-B magnets
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DOI：
10.1016/j.jmmm.2006.11.004
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发表时间：
2007-03
影响因子：
2.7
通讯作者：
H. Kato;T. Akiya;M. Sagawa;K. Koyama;T. Miyazaki
中科院分区：
文献类型：
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作者：
H. Kato;T. Akiya;M. Sagawa;K. Koyama;T. Miyazaki
研究了在最后阶段退火过程中施加的 140kOe 磁场对无镝 Nd-Fe-B 烧结磁体的影响。当含有少量Cu和Al的样品在Ha=140kOe的磁场下Ta=500和550°C退火时，与零磁场退火的对照样品相比，矫顽力H分别增加了20%和16%。该样品的 DSC 数据显示在 500 和 540°C 左右存在异常。这些结果根据 Nd2Fe14B 和晶间相之间界面匹配的场诱导变化进行了讨论。
An influence of a 140kOe magnetic field applied during the last-stage annealing process was investigated in Dy-free Nd-Fe-B sintered magnets. When a sample containing small amount of Cu and Al was annealed at Ta=500 and 550∘C under a magnetic field of Ha=140kOe, the coercivity Hcincreased by 20% and 16%, respectively, as compared with the control sample annealed at zero field. DSC data of this sample showed anomalies around 500 and 540∘C. These results were discussed in terms of a field-induced change in interface matching between Nd2Fe14B and intergranular phases.