Effects of Annealing on the Coercivity in Sintered Nd-Fe-B Magnets

被引：1
|
作者：
Akiya, Takahiro [1 ]
Kato, Hiroaki [1 ,2 ]
Une, Yasuhiro [3 ]
Sagawa, Masato [3 ]
机构：
[1] Tohoku Univ, New Ind Creat Hatchery Ctr, Sendai, Miyagi 9808579, Japan
[2] Yamagata Univ, Grad Sch Sci & Engn, Dept Appl Math & Phys, Yonezawa, Yamagata 9928510, Japan
[3] Intermetallics Co Ltd, Kyoto 6158245, Japan
来源：
JOURNAL OF THE JAPAN INSTITUTE OF METALS | 2012年 / 76卷 / 01期
关键词：
annealing temperature; coercivity; copper small additives; sintered neodymium-iron-boron magnet; post annealing; PERMANENT-MAGNETS; PHASE; MICROSTRUCTURE;
D O I：
10.2320/jinstmet.76.36
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
In order to understand the coercivity enhancement mechanism by annealing in sintered Nd-Fe-B magnets, we performed systematic annealing experiments. It was found that an addition of 0.13% of Cu not only enhance the coercivity but also ease the required cooling condition after annealing to obtain high coercivity. Using single successive annealing technique, we observed a 0.3 MA/m jump in coercivity at annealing temperature T-a=640 degrees C for Cu-free Nd-Fe-B magnets and at T-a=440-460 degrees C for Cu containing ones. We also observed sharp reduction of 0.15 MA/m in coercivity for Cu doped sintered Nd-Fe-B magnets at T-a=600 degrees C. Furthermore, we confirmed a reversible behavior of coercivity at the annealing temperature range which is lower than the optimal annealing temperature. This implies that some kinds of reversible structural natures depending on the temperature are closely related to the coercivity of sintered Nd-Fe-B magnets.
引用
收藏
页码：36 / 42
页数：7
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