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High Density Nanocrystalline Rare Earth and Dysprosium-free Magnets

机译:高密度纳米晶稀土和无镝的磁铁

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Melt spun Nd-Fe-B alloys are available in a variety of powder forms and contain nano-scale Nd_2Fe_(14)B grains. The powders can be near net-shape manufactured into isotropic polymer bonded magnets or fully dense, anisotropic magnets. This paper discusses some of the topical issues facing these magnets and their applications. Achieving higher flux magnets from the material remains a popular goal, although recent raw material supply issues have brought other concerns to the forefront of magnet development trends. One theme in particular has been to reduce the dependence of high performance magnets on heavy rare earth elements like Dy. The nano-scaled structure of hot deformed melt spun material gives it an advantage over the micro-scale sintered magnets in terms of H_(ci). Hot deformed magnets can achieve H_(ci)>1500 kA/m without Dy, while commercial sintered magnets tend to need between 2 and 3 wt% Dy to achieve a similar H_(ci).
机译:MELT SPUN ND-FE-B合金有多种粉末形式,含有纳米级ND_2FE_(14)B颗粒。粉末可以靠近净形状制造成各向同性聚合物键合磁体或全密集的各向异性磁体。本文讨论了这些磁铁及其应用面临的一些局部问题。尽管最近的原材料供应问题达到了磁铁发展趋势的最前沿,但虽然最近的原料供应问题达到了更高的磁通磁铁仍然是一个受欢迎的目标。特别是一个主题一直是降低高性能磁铁对像Dy这样的重稀土元素的依赖性。在H_(CI)方面,热变形熔融纺材料的纳米缩放结构使其在微级烧结磁体上得到了优点。热变形磁体可以在没有Dy的情况下实现H_(CI)> 1500kA / m,而商用烧结磁铁往往需要2至3wt%Dy以实现类似的H_(CI)。

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