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1. 发明授权

US07163591B2 Method of preparing micro-structured powder for bonded magnets having high coercivity and magnet powder prepared by the same 失效
标题翻译：制备具有高矫顽力的粘结磁体的微结构粉末和由其制备的磁体粉末的方法
公开(公告)号：US07163591B2
公开(公告)日：2007-01-16
申请号：US10734544
申请日：2003-12-12
申请人： Andrew S. Kim , Seok Namkung , Dong-Hwan Kim
发明人： Andrew S. Kim , Seok Namkung , Dong-Hwan Kim
IPC分类号： H01F1/053 , H01F1/057
CPC分类号： H01F1/09 , H01F1/0573
摘要： Disclosed is a method of preparing a micro-structured powder for bonded magnets having high coercivity, which is advantageous in terms of low preparation costs by recycling magnet scraps, simplified mass production, minimal environmental contamination by such a recycling process, and the preparation of stable anisotropic powders having high coercivity. Further, a magnet powder prepared by the above method is provided. The current method is characterized in that R—Fe—B type anisotropic sintered magnets or scraps thereof are crushed to prepare 50–500 μm sized magnet powders, which are then mixed with 1–10 wt % of rare earth fluoride (RF3) powders and thermally treated at high temperatures (500–1100° C.) in a vacuum or an inert gas, to cause the change of matrix-near surface and grain boundary of the powders. Thus obtained powders include a matrix phase having R2Fe14B crystal structure, a R-rich grain boundary phase containing rare earth fluoride, and other phases, in which the matrix phase has an average grain size of 1–20 μm, and the powders have an average size of 50–500 μm with superior magnetic characteristics of (BH)max≧20 MGOe and iHc≧5 kOe.
摘要翻译：公开了一种制备具有高矫顽力的粘结磁体的微结构粉末的方法，其通过回收磁体废料，简化的批量生产，通过这种再循环过程的最小环境污染而制备成本低，并且制备稳定的具有高矫顽力的各向异性粉末。此外，提供通过上述方法制备的磁铁粉末。目前的方法的特征在于将R-Fe-B型各向异性烧结磁体或其废料压碎以制备50-500毫米尺寸的磁体粉末，然后与1-10重量％的稀土氟化物（RF < 3）粉末，并在真空或惰性气体中在高温（500-1100℃）下进行热处理，导致粉末的基质 - 近表面和晶界的变化。由此获得的粉末包括具有R 2 Fe 14 B晶体结构的基质相，含有稀土氟化物的富R晶界相和其它相，其中基质相的平均粒径为1-20μm，粉末的平均粒径为50-500μm，具有优异的（BH）max> = 20MGOe和iHc> 5kOe的磁特性。

2. 发明申请

US20050081959A1 Method of preparing micro-structured powder for bonded magnets having high coercivity and magnet powder prepared by the same 失效
标题翻译：制备具有高矫顽力的粘结磁体的微结构粉末和由其制备的磁体粉末的方法
公开(公告)号：US20050081959A1
公开(公告)日：2005-04-21
申请号：US10734544
申请日：2003-12-12
申请人： Andrew Kim , Seok Namkung , Dong-Hwan Kim
发明人： Andrew Kim , Seok Namkung , Dong-Hwan Kim
IPC分类号： H01F1/057 , H01F1/09 , H01F1/06
CPC分类号： H01F1/09 , H01F1/0573
摘要： Disclosed is a method of preparing a micro-structured powder for bonded magnets having high coercivity, which is advantageous in terms of low preparation costs by recycling magnet scraps, simplified mass production, minimal environmental contamination by such a recycling process, and the preparation of stable anisotropic powders having high coercivity. Further, a magnet powder prepared by the above method is provided. The current method is characterized in that R—Fe—B type anisotropic sintered magnets or scraps thereof are crushed to prepare 50-500 μm sized magnet powders, which are then mixed with 1-10 wt % of rare earth fluoride (RF3) powders and thermally treated at high temperatures (500-1100° C.) in a vacuum or an inert gas, to cause the change of matrix-near surface and grain boundary of the powders. Thus obtained powders include a matrix phase having R2Fe14B crystal structure, a R-rich grain boundary phase containing rare earth fluoride, and other phases, in which the matrix phase has an average grain size of 1-20 μm, and the powders have an average size of 50-500 μm with superior magnetic characteristics of (BH)max≧20 MGOe and iHc≧5 kOe.
摘要翻译：公开了一种制备具有高矫顽力的粘结磁体的微结构粉末的方法，其通过回收磁体废料，简化的批量生产，通过这种再循环过程的最小环境污染而制备成本低，并且制备稳定的具有高矫顽力的各向异性粉末。此外，提供通过上述方法制备的磁铁粉末。目前的方法的特征在于将R-Fe-B型各向异性烧结磁体或其废料压碎以制备50-500毫米尺寸的磁体粉末，然后与1-10重量％的稀土氟化物（RF < 3）粉末，并在真空或惰性气体中在高温（500-1100℃）下进行热处理，导致粉末的基质 - 近表面和晶界的变化。由此获得的粉末包括具有R 2 Fe 14 B晶体结构的基质相，含有稀土氟化物的富R晶界相和其它相，其中基质相的平均粒径为1-20μm，粉末的平均粒径为50-500μm，具有优异的（BH）max> = 20MGOe和iHc> 5kOe的磁特性。

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