Nanocrystalline FeNdB permanent magnets with enhanced remanence
Nanocrystalline FeNdB permanent magnets with enhanced remanence
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DOI：
10.1063/1.362965
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发表时间：
1996-08-01
影响因子：
3.2
通讯作者：
Kronmuller, H
中科院分区：
文献类型：
--
作者：
Bauer, J;Seeger, M;Kronmuller, H
使用熔体纺丝工艺生产了具有增强剩磁的各向同性纳米晶交换耦合 FeNdB 磁体。从几乎单相的 Fe14Nd2B 磁体开始，通过降低 Nd 和 B 含量，复合磁体中附加 α-Fe 的含量逐步增加至 40 vol%。在含有 30 vol% α-Fe 的复合磁体中发现最大剩磁 J(R) = 1.25 T，最大磁能积达到值 (BH)(max) = 185 kJ/m(3)，而该成分的矫顽场为 mu(O)H(C) = 0.53 T。复合磁体的微观结构研究揭示了晶粒尺寸分布的两个特征最大值，分别位于 15 和 25 nm 处，分别对应于 α-Fe 相和 Fe14Nd2B 相。交换耦合对矫顽场的影响可以通过微观结构参数α(ex)来描述。根据矫顽场的温度依赖性，可以确定微观结构参数 alpha(K) alpha(ex) 和 N-eff。 (C) 1996 年美国物理研究所。
Isotropic nanocrystalline exchange coupled FeNdB magnets with enhanced remanence were produced using the melt spinning procedure. Starting from nearly single phase Fe14Nd2B magnets, the content of additional alpha-Fe in composite magnets was stepwise increased up to 40 vol % by reducing the Nd and B content. The maximum remanence of J(R) = 1.25 T was found in composite magnets containing 30 vol % alpha-Fe, the maximum energy product reaches the value (BH)(max) = 185 kJ/m(3), whereas the coercive field is mu(O)H(C) = 0.53 T for this composition. The microstructural investigations of the composite magnets reveal two characteristic maxima in the grain size distribution at about 15 and 25 nm corresponding to the alpha-Fe phase and to the Fe14Nd2B phase, respectively. The influence of the exchange coupling on the coercive field can be described by a microstructural parameter alpha(ex). From the temperature dependence of the coercive field the microstructural parameters alpha(K) alpha(ex) and N-eff are determined. (C) 1996 American Institute of Physics.