Modification of boundary structure and magnetic properties of Nd-Fe-B sintered magnets by diffusing Al/Cu co-added alloy ribbons
Modification of boundary structure and magnetic properties of Nd-Fe-B sintered magnets by diffusing Al/Cu co-added alloy ribbons
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DOI：
10.1016/j.scriptamat.2018.10.001
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发表时间：
2019-02
影响因子：
6
通讯作者：
Lu Kechao-;X. Bao;G. Chen;Xuejiao Zhang;Tan Minghui;X. Mu;Jiheng Li;Xuexu Gao
中科院分区：
文献类型：
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作者：
Lu Kechao-;X. Bao;G. Chen;Xuejiao Zhang;Tan Minghui;X. Mu;Jiheng Li;Xuexu Gao
Tb 70 Cu 30、Pr52.5Tb17.5Cu30、Pr 60 Tb 20 Al 20和Pr 60 Tb 10 Cu 15 Al 15（at.%）的润湿实验在Nd-Fe-B系烧结磁体上进行了铸锭试验，结果表明，含Al的合金具有较好的润湿性和流动性。界面分析表明，在Pr 60 Tb 20 Al 20与磁体的界面处，Tb主要沿沿着晶界扩散，没有出现添加Cu的铸锭中出现的异常富Tb晶粒。在此基础上，采用合金薄带晶界扩散法，在合金用量低于0.5wt.%的情况下，获得了11 kOe以上的矫顽力增量Pr_（60）Tb_（10）Cu_（15）Al_（15）扩散磁体中的Tb主要来源于均匀而薄的富Tb壳层。
Wetting experiments of Tb70Cu30, Pr52.5Tb17.5Cu30, Pr60Tb20Al20and Pr60Tb10Cu15Al15(at.%) ingots over Nd-Fe-B sintered magnet were carried out and suggested that alloys containing Al possessed better wettability and mobility. Interfacial analysis suggested that at interface between Pr60Tb20Al20and magnet, Tb mainly diffused along grain boundaries without abnormal Tb-rich grains, which were observed in the systems of Cu-added ingots. On the basis of these, grain boundary diffusion with alloy ribbons was applied and coercivity increment of over 11 kOe was achieved by consuming below 0.5 wt.% Tb in diffused magnet by Pr60Tb10Cu15Al15, which was mainly attributed to homogeneous and thin Tb-rich shells.