A method to improving the coercivity of sintered anisotropic Sm-Fe-N magnets
A method to improving the coercivity of sintered anisotropic Sm-Fe-N magnets
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DOI：
10.1016/j.jmmm.2018.04.047
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发表时间：
2018-09-01
影响因子：
2.7
通讯作者：
Gao, Xuexu
中科院分区：
文献类型：
--
作者：
Lu, Cifu;Zhu, Jie;Gao, Xuexu
本研究以亚微米级Sm2Fe17N3粉末为原料，采用放电等离子烧结法制备了块体各向异性烧结Sm2Fe17N3磁体。纯烧结的Sm2Fe17N3磁体的α-Fe含量很高，具有很低的矫直力(4.1 kOe)和较差的方形度(7.1%)。添加SmCu纳米片作为吸氧剂，提供了低氧烧结条件。所得到的烧结磁体的α-Fe含量较低，具有10.3kOe的高矫直力。在添加SmCu的烧结磁体中，Sm2Fe17N3相的分解被抑制，而SmCu粉被氧化。本研究的实验结果表明，在制备R-TM化合物基纳米块体磁体的过程中，添加合适的高活性吸氧剂可以有效地防止α-Fe析出物的形成，并提高其矫顽力。(C)2018爱思唯尔B.V.保留所有权利。
In this study, bulk anisotropic sintered Sm2Fe17N3 magnets were prepared from submicron-sized Sm2Fe17N3 powder by spark plasma sintering. The pure sintered Sm2Fe17N3 magnets contain high alpha-Fe content and have a very low coercivity of 4.1 kOe and poor squareness of 7.1%. The SmCu nanoflakes were added as oxygen absorber to provide a low-oxygen sintering condition. The resultant sintered magnets contain low alpha-Fe content and show a high coercivity of 10.3 kOe. In this SmCu added sintered magnets, the decomposition of Sm2Fe17N3 phase was suppressed and SmCu powder was oxidized instead. The experimental results of this study suggest that an addition of suitable high activity oxygen absorber may be effective in preventing the formation of alpha-Fe precipitates and improving the coercivity in the fabrication of R-TM compounds based nanostructured bulk magnets. (C) 2018 Elsevier B.V. All rights reserved.