| Nd-Fe-B永磁材料低磁时效机理研究 |
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| 引用本文： | 朱明刚,李岫梅,郭朝晖,李卫.Nd-Fe-B永磁材料低磁时效机理研究[J].物理学报,2005,54(12):5895-5900. |
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| 作者姓名： | 朱明刚 李岫梅 郭朝晖 李卫 |
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| 作者单位： | 钢铁研究总院功能材料研究所,北京 100081 |
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| 基金项目： | 国家高技术研究发展计划(批准号：2003AA32G020, 2004AA32G083)资助的课题. |
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| 摘 要： | 研究烧结Nd-Fe-B磁体的低磁时效问题.实验显示样品在室温293和353K经920d磁时效后，磁通量的衰减率分别为1.4%和13%，经老化处理后，磁通量的衰减率分别为6‰和6.9%，说明未做老化处理的磁体时间稳定性较差. 假设微观杂质运动临界能E1、极微小杂质运动临界能E2和移动原子对键取向转动临界能E3对时间稳定性的影响最为显著，依据半经典的Boltzmann统计分布，导出的烧结Nd-Fe-B磁体的低磁时效所满足的规律.理论结果与实验相符.
关键词：
烧结Nd-Fe-B
低磁时效
临界能
时间稳定性
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| 关 键 词： | 烧结Nd-Fe-B 低磁时效 临界能 时间稳定性 |
| 文章编号： | 1000-3290/2005/54（12）/5895-06 |
| 收稿时间： | 01 27 2005 12:00AM |
| 修稿时间： | 2005-01-272005-06-10 |
Mechanism of low magnetic aging of Nd-Fe-B permanent magnet |
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| Zhu Ming-Gang,Li Xiu-Mei,Guo Zhao-Hui,Li Wei.Mechanism of low magnetic aging of Nd-Fe-B permanent magnet[J].Acta Physica Sinica,2005,54(12):5895-5900. |
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| Authors: | Zhu Ming-Gang Li Xiu-Mei Guo Zhao-Hui Li Wei |
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| Institution: | Division of Functional Materials, Central Iron and Steel Research Institute, Beijing 100081, China |
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| Abstract: | The irreversible flux loss (FL) of sintered Nd-Fe-B magnets has been investigated after aging for about 920 d. Exposed at room temperature (RT) and 353K, the values of FL are about 1.4％ and 13%, respectively. However, with a pre-aging the FL are about 6‰ and 6.9% for the magnets exposed at RT and 353K, respectively. Therefore, the stability of flux has been improved obviously by the pre-aging. A phenomenological formula, based on the Boltzmann statistics, has been used to discuss the effect of microstructure on FL. It is found that the experimental results can be well explained by the formula. |
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| Keywords: | sintered Nd-Fe-B aging effect critical energy time stability |
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