Xiaoqiang Yu, Lei He, Yuting Hu, Jiajie Li, Xiao Liu, Yuhan Wang, Chunji Li, Munan Yang, Z. Zhong
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引用次数: 0
摘要
具有极高成本效益的含铈稀土磁体在世界范围内得到了广泛的研究。然而,当Ce浓度过高时,这种磁体表现出非常差的热稳定性和整体磁性能。为了消除这些缺点,我们在这项工作中考虑了共晶y50 ce50共取代合金。系统地研究了(Y, Ce, Nd)-Fe-B磁体的磁性能、显微组织和冶金行为。对于(Y 50 Ce 50) 10 Nd 20 Fe 68.9 B 1.1 SPSed永磁体,其总体磁性能为hcj = 725 kA/m, jr = 0.73 T, (BH) max = 81 kJ/m 3。简要描述了放电等离子烧结(SPS)过程中出现的粗晶粒区和细晶粒区。随着Nd含量的增加,有害的cefe2相消失。粗粒带的体积分数和宽度减小。主相中有富铈区和贫铈区,Y和Nd元素分布均匀。TEM结果表明,Nd和Ce在晶界富集,Y元素倾向于以2:14:1主相进入;这一工作有利于钕铁硼磁体中高丰度稀土元素的平衡利用。
Effects of Yttrium and Cerium co-substitution on Structures and Magnetic Properties of Nanocrystalline Nd-Fe-B Magnets
Cerium-containing (Ce) rare earth magnets with extraordinary cost-effectiveness are widely investigated around the world. However, when the concentration of Ce is much more, the kind of these magnets exhibits very poor thermal stability and overall magnetic properties. To weaken these disadvantages, we take eutectic Y 50 Ce 50 co-substitution alloys into account in this work. Magnetic properties, microstructures and metallurgical behaviors of (Y, Ce, Nd)-Fe-B magnets are systematically researched. For (Y 50 Ce 50 ) 10 Nd 20 Fe 68.9 B 1.1 SPSed permanent magnets, good overall magnetic properties are H cj = 725 kA/m, J r = 0.73 T and ( BH ) max = 81 kJ/m 3 . It schematically depicts that coarse grain zones and fine grain zones occur during the spark plasma sintering (SPS) process. With the Nd content increasing, the deleterious CeFe 2 phases disappear. In addition, the volume fraction and width of coarse grain zones decrease. Ce-rich and Ce-lean regions are also observed in main phases, while Y and Nd elements are uniformly distributed. TEM results show that Nd and Ce are rich in the grain boundary and Y elements prefer to enter in 2:14:1 main phases. This work is favorable to a balanced utilization of high abundance rare earth elements in Nd-Fe-B magnets.
期刊介绍:
The JOURNAL OF MAGNETICS provides a forum for the discussion of original papers covering the magnetic theory, magnetic materials and their properties, magnetic recording materials and technology, spin electronics, and measurements and applications. The journal covers research papers, review letters, and notes.