Development of Dy-less High Coercivity Magnets Using TransitionFrom Amorphous Phase to Crystalline One

利用非晶相向晶相转变开发无镝高矫顽力磁体

• 批准号: 22360128
• 负责人: FUKUNAGA Hirotoshi
• 金额: $ 12.06万
• 依托单位: Nagasaki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 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-22360128/
• 关键词: 磁性材料; 保磁力; Nd-Fe-B; 結晶化; 粒界拡散; マイクロクロマグネティクス; 表面拡散; マイクロマグネティクス

Computer simulation about relationship between coercivity of Nd-Fe-B magnet powders and recovery of magnetic anisotropy due to Dy diffusion clarified that the Dy diffusion from coating layers on powder surface is effective in improving the coercivity of isotropic Nd-Fe-B magnet powders with fine grains. The diffusion from a Dy-coating layers into grain boundaries was realized by using the transition from amorphous state to crystalline one at a low temperature and for short time. The coercivity of isotropic Nd-Fe-B magnet powders was improved by approximately 500 kA/m without remarkable reduction of remanence.

通过对Nd-Fe-B磁粉磁性能与Dy扩散恢复磁各向异性关系的计算机模拟，阐明了Dy从磁粉表面包覆层扩散对提高细晶粒各向同性Nd-Fe-B磁粉磁性能的有效性。利用非晶态向晶态的转变，在低温短时间内实现了Dy涂层向晶界的扩散。各向同性Nd-Fe-B磁粉的矫顽力提高了约500 kA/m，而剩磁没有显著降低。

项目成果

Micromagnetic Simulation of Enhancement of Coercivity in Nd-Fe-B/(Nd,Dy)-Fe-B Composite Magnets

Nd-Fe-B/(Nd,Dy)-Fe-B复合磁体矫顽力增强的微磁模拟

• 发表时间: 2011
• 作者: K. Kawasaki;T. Yanai;M. Nakano and H. Fukunaga
• 通讯作者: M. Nakano and H. Fukunaga

Coercivity enhancement of Dy-coated Nd-Fe-B flakes by crystallization

• DOI: 10.1063/1.3549604
• 发表时间: 2011-04
• 期刊: Journal of Applied Physics
• 影响因子: 3.2
• 作者: H. Fukunaga;Y. Sugimoto;M. Nakano;T. Yanai;S. Ohta;M. Itakura;M. Nishida

Numerical Study of Enhanced Coercivity of Nd-Fe-B Magnets with Antiferromagnetically Coupled Thin Surface Layers

具有反铁磁耦合薄表面层的 Nd-Fe-B 磁体增强矫顽力的数值研究

• 发表时间: 2013
• 作者: Y. Yokoi;M. Nakano;T. Yanai and H. Fukunaga
• 通讯作者: T. Yanai and H. Fukunaga

硬磁性結晶表面に存在する反強磁性結合薄層の保磁力に及ぼす影響-計算機解析-

薄反铁磁耦合层对硬磁晶体表面矫顽力的影响 - 计算机分析 -

• 发表时间: 2011
• 作者: Akihiro Hino;and Keiji Wada;福永博俊・横井佑司・中野正基・柳井武志
• 通讯作者: 福永博俊・横井佑司・中野正基・柳井武志

Computer Simulation of Enhancement of Coerciviy in Nd-Fe-B/(Nd,Dy)-Fe-B Composite Magnets.

Nd-Fe-B/(Nd,Dy)-Fe-B 复合磁体矫顽力增强的计算机模拟。

• 发表时间: 2010
• 作者: Kohei Kawasaki;Takeshi Yanai;Masaki Nakano;Hirotoshi Fukunaga
• 通讯作者: Hirotoshi Fukunaga