Development of high-coercivity SmFe12-based permanent magnet powders by reduction-diffusion method for achieving carbon neutrality

通过还原扩散法开发高矫顽力SmFe12基永磁粉末以实现碳中和

• 批准号: 21K20476
• 负责人: ZHAO LUO
• 金额: $ 1.83万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Research Activity Start-up
• 财政年份: 2021
• 资助国家: 日本
• 起止时间: 2021-08-30 至 2022-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-21K20476/
• 关键词: Permanent magnet; SmFe12; Coercivity; Reduction-diffusion; ThMn12; 永久磁石; 保磁力; 還元拡散法; 微粒子

We proposed a new approach to improve coercivity by generating weak-magnetic layers at the surfaces of fine magnetic powders in SmFe10V2-xSm2O3 (x represents the mole ratio of Sm2O3 to SmFe10V2) system. The optimal composition of SmFe10V2-0.5Sm2O3 with this special structure displays a high coercivity of 744.9 kA/m because the phase purity and high properties of magnetic SmFe10V2 matrix are maintained while the exchange interactions of adjacent magnetic powders are suppressed by the weak-magnetic Sm-rich layers.This work reports a new effective approach to acquire high coercivity by generating weak-magnetic layers around the fine magnetic powders, which is different from the conventional way to precipitate weak-magnetic intergranular phases from the magnetic matrixes. Thus, our work may give a new insight to design high-coercivity magnets.

提出了一种在SmFe_（10）V_（2-x）Sm_2 O_3（x为Sm_2 O_3与SmFe_（10）V_2的摩尔比）体系中，通过在磁粉表面形成弱磁层来提高磁性的新方法。由于SmFe_（10）V_2 - 0.5Sm_2O_3磁性基体的相纯度和高性能得以保持，同时弱磁性的富Sm层抑制了相邻磁粉之间的交换作用，因此，具有这种特殊结构的SmFe_（10）V_2 - 0.5Sm_2O_3的最佳成分显示出744.9kA/m的高矫顽力。与传统的从磁性基体中析出弱磁性晶间相的方法不同，因此，我们的工作可能会提供一个新的见解，设计高矫顽力磁体。

项目成果

High-coercivity SmFe10V2 powder with Sm-rich layers prepared by a reduction-diffusion process

还原扩散法制备富Sm层高矫顽力SmFe10V2粉末

• DOI: 10.1016/j.jmmm.2022.169239
• 发表时间: 2022
• 期刊: Journal of Magnetism and Magnetic Materials
• 影响因子: 2.7
• 作者: Zhao Luo;Matsuura Masashi;Yamamoto Kuniko;Sugimoto Satoshi
• 通讯作者: Sugimoto Satoshi

還元拡散法による高保磁力SmFe10V2磁石粉末の作製

还原扩散法制备高矫顽力SmFe10V2磁粉

• 发表时间: 2022
• 作者: ZHAO LUO;松浦 昌志;杉本 諭
• 通讯作者: 杉本 諭