結晶粒微細化によるNd-Fe-B焼結磁石の高保磁力化
結晶粒微細化によるNd-Fe-B焼結磁石の高保磁力化
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通过晶粒细化提高Nd-Fe-B烧结磁体的矫顽力
DOI：
10.2320/jinstmet.76.12
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发表时间：
2012
影响因子：
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通讯作者：
眞人 佐川
中科院分区：
文献类型：
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作者：
康裕 宇根;眞人 佐川
为了提高没有Dy替代的Nd-Fe-B烧结磁体的矫顽力，我们探索了通过使用具有最终小粒度的起始粉末来减小烧结体的粒度来提高矫顽力的可能性。为了生产如此小粒度的Nd-Fe-B合金粉末，并对其进行处理以生产无氧化的烧结体，我们开发了一种特殊的气流粉碎机和一种称为无压工艺（PLP）的特殊工艺。通过利用这些技术，已经可以生产具有1.59 MA/m的磁化率的Nd-Fe-B烧结磁体，而没有Dy替代，与之相比，市售的不含Dy的Nd-Fe-B烧结磁体的磁化率为0.87 MA/m。
For the purpose of increasing the coercivity of the Nd-Fe-B sintered magnets without Dy substitution, we explored a possibility of enhancing the coercivity by grain size reduction of the sintered body by employing the starting powder with an ultimately small particle size. To produce Nd-Fe-B alloy powder with such a small particle size, and to handle it to produce sintered bodies without oxidation, we developed a special jet mill and a special process called pressless process (PLP). By utilizing these techniques, it has become feasible to produce Nd-Fe-B sintered magnets with a coercivity of 1.59 MA/m without Dy substitution which is compared with 0.87 MA/m for the commercially available Nd-Fe-B sintered magnets containing no Dy.