Enhancement of Coercivity of Nd-Fe-B Sintered Magnets by Grain Size Reduction

被引：38

作者：

Une, Yasuhiro ^{[1
]}

Sagawa, Masato ^{[1
]}

机构：

[1] Intermetallics Co Ltd, Kyoto 6158245, Japan

来源：

JOURNAL OF THE JAPAN INSTITUTE OF METALS | 2012年 / 76卷 / 01期

关键词：

neodymium-iron-boron sintered magnet; dysprosium; coercivity; helium jet mill;

D O I：

10.2320/jinstmet.76.12

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

For the purpose of increasing the coercivity of the Nd-Fe-B sintered magnets without Dy substitution, we explored a possibility of enhancing the coercivity by grain size reduction of the sintered body by employing the starting powder with an ultimately small particle size. To produce Nd-Fe-B alloy powder with such a small particle size, and to handle it to produce sintered bodies without oxidation, we developed a special jet mill and a special process called pressless process (PLP). By utilizing these techniques, it has become feasible to produce Nd-Fe-B sintered magnets with a coercivity of 1.59 MA/m without Dy substitution which is compared with 0.87 MA/m for the commercially available Nd-Fe-B sintered magnets containing no Dy.

引用

页码：12 / 16

页数：5