Creation of nano-magnet model thin films with HRE ideal interface for reducing rare-metal

创建具有 HRE 还原稀有金属理想界面的纳米磁体模型薄膜

• 批准号: 22560688
• 负责人: KOIKE Kunihiro
• 金额: $ 3万
• 依托单位: Yamagata University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22560688/
• 关键词: モデル界面; 超高真空成膜; 微細化効果; 被覆効果; 永久磁石; レアメタル; ジスプロシウム; ネオジム磁石; Nd-Fe-B; 界面; 粒界相; 重希土類(HRE); Dy; 保磁力

Nd-Fe-B sintered magnets have a potential for wide application such as a high performance motor for hybrid electric vehicle (HEV) and direct drive widow turbine. Recently, a new technique to enhance the coercivity H_c by using lesser amount of heavy rare earth element (HRE) has been developed, which is called a grain boundary diffusion process “GBDP". On the other hand, it is believed that the Nd-rich phase plays an important role in the coercivity enhancement in Nd-Fe-B magnets. In the case of GBDP magnets with Dy, however, it is still not clear whether only the Dy-rich shell or both Dy-shell and the Nd-rich phase are indispensible for the high H_c. Therefore, we fabricated a model interface system, which consists of the Nd_2Fe_<14>B layer with Dy overlayer and Dy/Nd double over-layer in order to study the relationship between microstructure near the interface and the coercivity.

Nd-Fe-B烧结磁体在混合动力汽车（HEV）用高性能电机、直驱式涡轮涡轮机等方面具有广阔的应用前景。近年来，人们发展了一种用少量重稀土元素（HRE）提高Hc的新方法，即晶界扩散法（GBDP）。另一方面，富Nd相在Nd-Fe-B磁体的矫顽力提高中起着重要的作用。然而，对于含Dy的GBDP磁体，是否只有富Dy壳层或富Dy壳层和富Nd相是高H_c所必需的还不清楚。为此，我们制作了一个由Nd_2Fe_<14>B层和Dy/Nd双层覆盖层组成的模型界面系统，以研究界面附近的微观结构与矫顽力的关系。

项目成果

Evaluation of Exchange Coupling in Nd_2Fe_<14>B/α-Fe Interfaces

Nd_2Fe_<14>B/α-Fe界面交换耦合评价

• 发表时间: 2012
• 期刊: Proc on the 22th International Workshop on Rare-earth Permanent Magnets and their Applications, Nagasaki, Japan
• 作者: D. Ogawa;K. Koike;S. Mizukami;T. Miyazaki;M. Oogane;Y. Ando;and H. Kato
• 通讯作者: and H. Kato

Effect of Substrate Temperature during Deposition of Nd overlayer on the Coercivity in Nd-Fe-B Thick Films RC-08

沉积 Nd 覆盖层时基底温度对 Nd-Fe-B 厚膜 RC-08 矫顽力的影响

• 发表时间: 2010
• 作者: S. Igarashi;K. Koike;T. Miyazaki;Y. Mizuno;D. Ogawa;T. Akiya;H. Kimura;Y. Adachi and H. Kato
• 通讯作者: Y. Adachi and H. Kato

Kato/Adachi/Koike Lab

加藤/足立/小池实验室

Coercivity enhancement phenomena observed in various series of Nd_2Fe_<14>B thin films

不同系列Nd_2Fe_<14>B薄膜中观察到的矫顽力增强现象

• 发表时间: 2012
• 期刊: Proc on the 22th International Workshop on Rare-earth Permanent Magnets and their Applications, Nagasaki, Japan
• 作者: K. Koike;T. Kusano;D. Ogawa;T. Miyazaki;Y. Ando;and H. Kato
• 通讯作者: and H. Kato

Effect of Rare-Earth Overlayers on the Coercivity in Nd-Fe-B Films

稀土覆盖层对 Nd-Fe-B 薄膜矫顽力的影响

• 发表时间: 2012
• 期刊: Proc on the 22th International Workshop on Rare-earth Permanent Magnets and their Applications, Nagasaki, Japan
• 作者: J. Umezawa;Y. Sakai;K. Koike;D. Ogawa;Y. Mizuno;T. Miyazaki;Y. Ando;and H. Kato
• 通讯作者: and H. Kato