Dy2O3掺杂对机械球磨Nd2Fe14B/α-Fe复合磁体矫顽力的影响*

doi:10.11901/1005.3093.2015.343

材料研究学报

2016, Vol. 30

Issue (2): 95-98 DOI: 10.11901/1005.3093.2015.343

本期目录 | 过刊浏览

Dy₂O₃掺杂对机械球磨Nd₂Fe₁₄B/α-Fe复合磁体矫顽力的影响*

李迎飞, 田娜(

), 范晓东, 游才印

西安理工大学材料科学与工程学院西安 710048

Influence of Dy₂O₃ Doping on Coercivity of Mechanically Milled Nd₂Fe₁₄B/α-Fe Composite Magnets

LI Yingfei, TIAN Na^**(

), FAN Xiaodong, YOU Caiyin

(School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China)

引用本文:

李迎飞, 田娜, 范晓东, 游才印. Dy₂O₃掺杂对机械球磨Nd₂Fe₁₄B/α-Fe复合磁体矫顽力的影响*[J]. 材料研究学报, 2016, 30(2): 95-98.
Yingfei LI, Na TIAN, Xiaodong FAN, Caiyin YOU. Influence of Dy₂O₃ Doping on Coercivity of Mechanically Milled Nd₂Fe₁₄B/α-Fe Composite Magnets[J]. Chinese Journal of Materials Research, 2016, 30(2): 95-98.

全文: PDF(808 KB) HTML

摘要:

用机械球磨法制备Nd₂Fe₁₄B/α-Fe复合磁体, 研究了Dy₂O₃掺杂对纳米复合磁体磁性能的影响.结果表明, 掺入Dy₂O₃能显著提高复合磁体的矫顽力, 且随着Dy₂O₃掺杂量的增大最大矫顽力对应的退火温度降低.X射线衍射分析结果表明, 掺入Dy₂O₃使Nd₂Fe₁₄B的晶格常数减小, 也即Dy部分替代Nd后生成了(Nd, Dy)₂Fe₁₄B硬磁相.因此, 复合磁体矫顽力的增强主要归因于硬磁相磁晶各向异性的提高.但是, 硬磁相磁晶各向异性的提高缩短了有效交换耦合长度, 表现为过量掺杂Dy₂O₃使矫顽力降低.

关键词 ：金属材料, Nd2Fe14B/α, -Fe, Dy2O3掺杂, 矫顽力, 交换耦合

Abstract：

Nd₂Fe₁₄B/α-Fe composite magnets were fabricated by mechanically ball milling. The influence of Dy₂O₃ doping on the coercivity of the nanocomposite magnets was studied in detail. It was found that the coercivity of the composite magnets can be significantly improved by Dy₂O₃ doping, and the annealing temperature corresponding to the maximum coercivity decreases with the increase of Dy₂O₃ content. X-ray diffraction analysis shows that the lattice parameters of Nd₂Fe₁₄B decreased due to Dy₂O₃ doping, indicating that (Nd, Dy)₂Fe₁₄B hard magnetic phase formed after Dy partial replacement for Nd. Therefore, the enhancement of coercivity of the magnets can be mainly attributed to the increase of the magnetic crystalline anisotropy of the hard magnetic phase. However, with the increase of the magnetic crystalline anisotropy, the effective exchange coupling length was shortened, thereby, the coercivity dropped due to over doping of Dy₂O₃.

Key words： metal material Nd2Fe14B/α -Fe composite magnet Dy2O3 doping coercivity exchange coupling

收稿日期: 2015-06-12

ZTFLH:

O482

基金资助:* 国家自然科学基金 51301129, 51171148, 51371140,霍英东基金 131103,陕西省自然科学基金 2013JQ6008,陕西省电工材料与熔渗技术创新团队计划 2012KCT-25资助项目

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图1 不同Dy2O3掺杂量的复合磁体973 K退火后的XRD图谱

表1 掺杂不同量Dy2O3 的复合磁体973 K 退火后的晶格常数

图2 不同Dy2O3掺杂量的复合磁体的室温矫顽力与退火温度的关系

图3 不同Dy2O3掺杂量的复合磁体973 K退火后的磁滞回线

图4 不同Dy2O3掺杂量的复合磁体退火后的矫顽力与测量温度的关系, 内插图为在70 K和300 K测得的矫顽力与Dy2O3掺杂量的关系

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