Magnetic properties, thermal stability, and microstructure of spark plasma sintered multi-main-phase Nd-Ce-Fe-B magnet with PrCu addition
Magnetic properties, thermal stability, and microstructure of spark plasma sintered multi-main-phase Nd-Ce-Fe-B magnet with PrCu addition
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DOI：
10.1016/j.jallcom.2019.153612
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发表时间：
2020-05
影响因子：
6.2
通讯作者：
X. Cui;H.J. Zhang;J. Pan;C. Cui;L.L. Cheng;T. Ma;J. Zhang;C. Wang;T. Chen;X.J. Xu-X.J
中科院分区：
文献类型：
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作者：
X. Cui;H.J. Zhang;J. Pan;C. Cui;L.L. Cheng;T. Ma;J. Zhang;C. Wang;T. Chen;X.J. Xu-X.J
熔融纺丝制备的纳米结构多主相钕铁硼磁体具有实现高性能的巨大潜力。然而，由于Ce2Fe14B相的固有性能较差，导致该磁体的矫顽力和热稳定性较低。本研究通过晶间添加将低熔点pr68cu32粉末引入纳米MMP磁体中，进一步提高其矫顽力和热稳定性。当pr68cu32添加量仅为2 wt%时，材料的固有矫顽力hcjh和热稳定性显著提高，剩余物略有减少，最大能积（BH）max最大。通过组织、成分表征和热力学计算，揭示了添加pr68cu32后MMP磁体的微观结构演变，并提出了结构模型。此外，结合微磁模拟，系统分析了磁性能变化的机制。
Nanostructured multi-main-phase (MMP) Nd-Ce-Fe-B magnet produced by melt-spinning powders has great potential for achieving high performance. However, the inferior intrinsic properties of the Ce2Fe14B phase lead to the low coercivity and thermal stability of this magnet. In this study, low-melting-point Pr68Cu32powders were introduced into nanostructured MMP magnet through intergranular addition to further improve its coercivity and thermal stability. When only 2 wt% Pr68Cu32was added, the intrinsic coercivityHcjand thermal stability were significantly improved with a slight reduction in the remanenceBrand the maximum energy product (BH)max. The microstructure evolution of MMP magnet with adding Pr68Cu32was revealed by microstructural and compositional characterization and thermodynamic calculation, and a schematic model was proposed. Furthermore, mechanisms underlying changes in magnetic properties were systematically analyzed by combining micromagnetic simulation.