| Nd-Fe-B磁体烧结致密化过程的研究 |
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| 引用本文： | 刘湘涟,周寿增. Nd-Fe-B磁体烧结致密化过程的研究[J]. 稀有金属, 2006, 30(5): 604-609 |
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| 作者姓名： | 刘湘涟 周寿增 |
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| 作者单位： | 1. 湘潭大学机械工程学院,湖南湘潭,411105
2. 北京科技大学新金属材料国家重点实验室,北京,100083 |
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| 基金项目： | 国家重点基础研究发展计划(973计划) |
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| 摘 要： | 定量描述了Nd-Fe-B磁体的烧结致密化过程, 分析了有效稀土含量、合金粉末粒度与烧结致密化过程的关系, 讨论了Nd-Fe-B磁体烧结过程的致密化机制. Nd-Fe-B磁体烧结致密化过程可分为3个阶段, 即致密化过程迅速进行阶段、缓慢进行阶段、相对稳定阶段;随着烧结温度的上升, 第一阶段表现得更为突出, 第二阶段对应的烧结时间区段大大缩短. 有效稀土含量的提高、合金粉末粒度的减小显著促进Nd-Fe-B磁体烧结致密化过程. 主相颗粒重排以及主相颗粒长大与形状适位性变化是Nd-Fe-B磁体烧结过程的两类主要致密化机制, 而且后者对于Nd-Fe-B烧结磁体实现完全致密化起着决定性的作用.
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| 关 键 词： | Nd-Fe-B磁体 烧结 致密化 稀土 |
| 文章编号： | 0258-7076（2006）05-0604-06 |
| 收稿时间： | 2006-05-15 |
| 修稿时间： | 2006-05-152006-07-25 |
Densification during Sintering of Nd-Fe-B Magnet |
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| Liu Xianglian,Zhou Shouzeng. Densification during Sintering of Nd-Fe-B Magnet[J]. Chinese Journal of Rare Metals, 2006, 30(5): 604-609 |
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| Authors: | Liu Xianglian Zhou Shouzeng |
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| Affiliation: | 1. School of Mechanical Engineering, Xiangtan University, Xiangtan 41110.5, China ; 2. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing , Beijing 100083, China |
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| Abstract: | The densification process and densification mechanism during sintering of Nd-Fe-B magnets were investigated. The densification process includes rapid densification stage, slow densification stage and saturation densification stage. A higher effective total rare earth content or a smaller average size of ahoy powder accelerates the densification process markedly. The densification process progresses through NdzFe14B grain rearrangement, NdzFe14B grain growth and NdzFe14B grain shape accommodation. Moreover, NdzFe14B grain growth and NdzFe14B grain shape accommodation are considered to be the key factors leading to full densifieation of sintered Nd-Fe-B magnet. |
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| Keywords: | Nd-Fe-B magnet sintering densification rare earths |
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