退火温度对NdFeB磁体微观结构与磁性能的影响

doi:10.13251/j.issn.0254-6051.2024.12.009

金属热处理 ›› 2024, Vol. 49 ›› Issue (12): 57-61.DOI: 10.13251/j.issn.0254-6051.2024.12.009

退火温度对NdFeB磁体微观结构与磁性能的影响

李欢^1,2, 王俊勃², 刘江南², 思芳², 吴树杰³, 董义³

1.西安摩尔石油工程实验室股份有限公司, 陕西西安 710065;
2.西安工程大学材料工程学院, 陕西西安 710048;
3.包头天和磁材科技股份有限公司, 内蒙古包头 014010

收稿日期:2024-06-09 修回日期:2024-10-20 出版日期:2024-12-25 发布日期:2025-02-05
通讯作者: 王俊勃,教授,博士,E-mail:wangjunbo@xpu.edu.com
作者简介:李欢(1996—),女,硕士研究生,主要研究方向为磁性材料,E-mail:727166735@qq.com。

Effect of annealing temperature on microstructure and magnetic properties of NdFeB magnets

Li Huan^1,2, Wang Junbo², Liu Jiangnan², Si fang², Wu Shujie³, Dong Yi³

1. Xi'an Maurer Petroleum Engineering Laboratory Co., Ltd., Xi'an Shaanxi 710065, China;
2. School of Materials Engineering, Xi'an Polytechnic University, Xi'an Shaanxi 710048, China;
3. Baotou Tianhe Magnetic Materials Technology Co., Ltd., Baotou Inner Mongolia 014010, China

Received:2024-06-09 Revised:2024-10-20 Online:2024-12-25 Published:2025-02-05

摘要/Abstract

摘要： 为研究退火处理对钕铁硼磁体微观结构和磁性能的影响,对粉末烧结钕铁硼磁体在500~600 ℃下进行退火处理,采用XRD、SEM、磁性能测量仪对NdFeB磁体进行分析与表征。结果表明,退火处理对NdFeB磁体主相Nd₂Fe₁₄B的结构影响很小,主要是影响富Nd相的分布与成分。退火处理后NdFeB磁体的内禀矫顽力都有不同程度的提升。经550 ℃退火处理后,富Nd相连续、均匀分布于主相Nd₂Fe₁₄B晶粒边界,且富Nd相中Nd的含量增加,Fe的含量降低,磁体的内禀矫顽力提升效果最佳,从1135 kA/m提高到1434 kA/m,相应提升了26.3%;退火处理后磁体的剩磁没有明显变化,最大磁能积有不同程度的降低。

关键词: 钕铁硼磁体, 退火温度, 微观结构, 内禀矫顽力, 剩磁, 最大磁能积

Abstract: To investigate the effect of annealing treatment on the microstructure and magnetic properties of NdFeB magnets, powder sintered NdFeB magnets were annealed at 500-600 ℃. XRD, SEM and magnetic performance measuring instruments were used to analyze and characterize the NdFeB magnets. The results show that the annealing treatment has little effect on the structure of the main phase Nd₂Fe₁₄B of the NdFeB magnets, but mainly affects the distribution and composition of the rich-Nd phase. After annealing treatment, the coercivity of the NdFeB magnets is improved to varying degrees. After annealing at 550 ℃, the rich Nd phase is continuous and uniformly distributed along the grain boundaries of the Nd₂Fe₁₄B main phase, and the content of Nd in the rich-Nd phase increases while the content of Fe decreases, and the coercivity of the magnets has the best improvement effect, increasing from 1135 kA/m to 1434 kA/m, correspondingly increased by 26.3%. After annealing treatment, the residual magnetism of the magnets doesn't change significantly, but the maximum magnetic energy product decreases to varying degrees.

Key words: NdFeB magnets, annealing temperature, microstructure, coercivity, residual magnetism, maximum magnetic energy product

中图分类号:

TG146.454

李欢, 王俊勃, 刘江南, 思芳, 吴树杰, 董义. 退火温度对NdFeB磁体微观结构与磁性能的影响[J]. 金属热处理, 2024, 49(12): 57-61.

Li Huan, Wang Junbo, Liu Jiangnan, Si fang, Wu Shujie, Dong Yi. Effect of annealing temperature on microstructure and magnetic properties of NdFeB magnets[J]. Heat Treatment of Metals, 2024, 49(12): 57-61.

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退火温度对NdFeB磁体微观结构与磁性能的影响

Effect of annealing temperature on microstructure and magnetic properties of NdFeB magnets

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