Effect of Cu redistribution in grain boundary on magnetic properties of Sm(Co0.665Fe0.25Cu0.06Zr0.025)7 permanent magnets
Effect of Cu redistribution in grain boundary on magnetic properties of Sm(Co0.665Fe0.25Cu0.06Zr0.025)7 permanent magnets
复制标题
晶界Cu再分布对Sm(Co0.665Fe0.25Cu0.06Zr0.025)7永磁体磁性能的影响
DOI：
10.1016/j.jallcom.2018.01.164
复制
发表时间：
2018-04-15
影响因子：
6.2
通讯作者：
Du, Y. H.
中科院分区：
文献类型：
--
作者：
Wang, Y. Q.;Yue, M.;Du, Y. H.
研究了Sm(Co0.665Fe0.25Cu0.06Zr0.025)(7)磁体制备条件与微观结构和磁性能的关系。烧结温度从1468 K提高到1493 K，促进了小晶粒向大晶粒的合并，导致平均晶粒尺寸从10 mm增大到25 mm， Cu从内晶粒向Cu贫晶界扩散。结果表明，磁体的退磁曲线的平方度显著提高，最大能积从21.3 MGOe显著提高到27.1 MGOe。同时，磁体矫顽力从25.3 μ k下降到16.0 μ k，平均畴宽从小晶粒的1.1 μ m增加到大晶粒的2.5 μ m，证实了这一点。因此，调整制备条件可以使Cu的分布更加均匀，这对提高磁性能至关重要。(C) 2018 Elsevier B.V.版权所有
The correlation between preparation conditions and microstructure as well as magnetic properties were studied for Sm(Co0.665Fe0.25Cu0.06Zr0.025)(7) magnets. Increase of sintering temperature from 1468 to 1493 K promotes the amalgamation of small grains into big ones, resulting in an enlargement of average grain size from 10 to 25 mm and diffusion of Cu from inner grains to Cu-lean grain boundaries. As a result, the demagnetization curve squareness of the magnets improves substantially, leading to a remarkable enhancement of the maximum energy product from 21.3 to 27.1 MGOe. The coercivity of the magnets drops from 25.3 to 16.0 kOe at the same time, which was verified by the increase of the average domain width from 1.1 mu m in small grains to 2.5 mu m in big grains. It is therefore concluded that tuning of the preparation conditions causes a more homogeneous distribution of Cu, which is crucial for the improvement of magnetic properties. (C) 2018 Elsevier B.V. All rights reserved.