Thermal stability of high-temperature compound La2Fe14B and magnetic properties of Nd-La-Fe-B alloys
Thermal stability of high-temperature compound La2Fe14B and magnetic properties of Nd-La-Fe-B alloys
复制标题
高温化合物La2Fe14B的热稳定性及Nd-La-Fe-B合金的磁性能
DOI：
10.1016/j.jallcom.2020.157780
复制
发表时间：
2021-01-28
影响因子：
6.2
通讯作者：
Rao, Guanghui
中科院分区：
文献类型：
--
作者：
Li, Xiaoming;Lu, Zhao;Rao, Guanghui
采用x射线粉末衍射、电子探针微量分析仪和差示扫描量热等综合技术研究了La2Fe14B三元化合物的热稳定性和精细晶体结构。结果表明，La2Fe14B是一种高温稳定的三元化合物，在794℃时发生共析反应：La2Fe14B -> La + Fe + LaFe4B4，熔体发生包晶反应：通过研究La取代对Nd2-xLaxFe14B合金磁性能的影响，发现Nd1.3La0.2Fe14B合金仍然保持优异的最大能积（113 kJ/m(3)）、固有矫顽力（523 kA/m）和高剩余磁极化（0.83 T）。此外，还详细讨论了Nd2-xLaxFe14B合金的磁性增强机理。本工作有助于设计低成本、高含量的高性能2:14:1型磁体。(C) 2020 Elsevier B.V.版权所有
The thermal stability and refined crystal structure of ternary La2Fe14B compound were investigated by integrating X-ray powder diffraction, electron probe microanalyzer and differential scanning calorimetry techniques. It was found that La2Fe14B is a high-temperature stable ternary compound, which decomposes with a eutectoid reaction: La2Fe14B -> La + Fe + LaFe4B4 at 794 degrees C and melts via a peritectic reaction: Fe + Fe2B + Liquid -> La2Fe14B at 926 degrees C. By investigating the effects of La substitution on the magnetic properties of Nd2-xLaxFe14B alloys, it was revealed that the Nd1.3La0.2Fe14B alloy still keeps excellent maximum energy product (113 kJ/m(3)), intrinsic coercivity (523 kA/m) and high remanent magnetic polarization (0.83 T). Moreover, the magnetic improvement mechanisms of Nd2-xLaxFe14B alloys were also discussed in detail. The present work is beneficial to design high-performance 2:14:1-type magnets with low-cost and abundant La addition. (C) 2020 Elsevier B.V. All rights reserved.