Nd-Fe-B sintered magnets with low rare earth content fabricated via Dy71.5Fe28.5 grain boundary restructuring

Nd-Fe-B sintered magnets with low rare earth content fabricated via Dy71.5Fe28.5 grain boundary restructuring
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Dy71.5Fe28.5晶界重组制备低稀土含量Nd-Fe-B烧结磁体

DOI:
10.1016/j.jmmm.2019.166162
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发表时间:
2020-03
影响因子:
2.7
通讯作者:
Yan Mi
Yan Mi
中科院分区:
材料科学3区
文献类型:
--
作者:
Zhang Zhiheng;Jin Jiaying;Ma Tianyu;Liang Liping;Yan Mi

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本文报道了含12.6- 12.9at.%的Nd-Fe-B烧结磁体稀土元素的最大磁能积(BH)max为48.0-48.8 MGOe,剩磁Br为1.40-1.41 T,矫顽力Hcj为12.2-14.5 kOe,转变为近化学计量比的(Pr,Nd)12.3FebalB6.1(2:14:1相,at.%)通过晶界重组(GBR)的方法。低熔点的Dy 71.5Fe 28.5添加剂促进液相烧结过程以实现高致密化,并产生连续的晶界层,该晶界层很好地隔离主相晶粒。此外,Dy富集在2:14:1晶粒的表面区域而不是中心,不仅通过增强局部磁晶各向异性场来增加矫顽磁力,而且还保持了剩磁。Dy71.5Fe28.5重组磁体的稀土总量远低于具有相同磁性能的商业磁体(通常为13.5- 14.0at.%)。展望了GBR法制备高性能Nd-Fe-B的前景。
Here we report that Nd-Fe-B sintered magnets containing only 12.6–12.9 at.% rare earth elements exhibit maximum energy product (BH)maxof 48.0–48.8 MGOe, remanenceBrof 1.40–1.41 T, and coercivityHcjof 12.2–14.5 kOe, which are prepared through introducing eutectic Dy71.5Fe28.5(at.%) into the near-stoichiometric (Pr,Nd)12.3FebalB6.1(2:14:1 phase, at.%) magnets via grain boundary restructuring (GBR) approach. The low-melting-point Dy71.5Fe28.5additive facilitates the liquid phase sintering process to achieve high densification, and generates continuous grain boundary layers that well isolate the main phase grains. Moreover, Dy enrichment at the surface region rather than the center of 2:14:1 grains not only increases the coercivity by enhancing the local magnetocrystalline anisotropy field, but also maintains the remanence. The fact that total rare earth contents of Dy71.5Fe28.5-restructured magnets are much lower than those commercial ones with equivalent magnetic performance (usually 13.5–14.0 at.%) delights the prospective future of GBR approach on fabricating high-performance Nd-Fe-B.
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