硼含量对烧结钕铈铁硼磁体微观组织及磁性能的影响
The Effect of Boron Content on the Microstructure and Magnetic Properties of Sintered Nd-Ce-Fe-B Magnets
DOI: 10.12677/ms.2024.146101, PDF,   
作者: 赵文强, 李柱柏*：内蒙古科技大学材料与冶金学院，内蒙古 包头；陈夫刚：江苏科技大学材料科学与工程学院，江苏 镇江
关键词: 稀土永磁；Nd-Ce-Fe-B；B含量；磁性能；微观组织；Rare Earth Permanent Magnet； Nd-Ce-Fe-B； Boron Content； Magnetic Properties； Microstructure
摘要: 本文研究了不同硼(B)含量(0.91 wt%、0.94 wt%和0.97 wt%)烧结钕铈铁硼(Nd-Ce-Fe-B)磁体的磁性能、微观组织及硬度。烧结Nd-Ce-Fe-B磁体的矫顽力随着B含量从0.97 wt%降低到0.91 wt%，矫顽力从15.07 kOe增加到16.30 kOe，而剩磁几乎保持不变。金相分析发现B含量的变化不影响磁体的晶粒尺寸，但是晶界富稀土相的量随着B含量的降低而增加，B含量为0.91 wt%的磁体的晶界相分布连续性明显优于B含量为0.94 wt%和0.97 wt%的磁体。通过背散射电子图像进一步分析发现，降低B的含量可以有效提升晶界富稀土相的数量和分布均匀性。晶界相的增加使晶粒间的磁交换耦合作用减弱，提升了磁体的矫顽力。XRD分析表明降低B的含量可以提高磁体的取向度。显微硬度分析发现降低B含量还可以有效降低磁体的硬度，改善其切削加工性能。本文的研究成果可为制备低成本高性能Nd-Ce-Fe-B提供理论指导和技术支撑。
Abstract: This study investigates the magnetic properties, microstructure, and hardness of sintered Nd-Ce-Fe-B magnets with different boron (B) contents (0.91 wt%, 0.94 wt%, and 0.97 wt%). The coercivity of the sintered Nd-Ce-Fe-B magnets increases from 15.07 kOe to 16.30 kOe as the B content decreases from 0.97 wt% to 0.91 wt%, while the remanence remains almost unchanged. Metallographic analysis reveals that the variation in B content does not affect the grain size of the magnets, but the amount of rare earth-rich phase at grain boundaries increases with decreasing B content. The distribution continuity of the grain boundary phase in the magnets with 0.91 wt% B content is significantly better than that in magnets with 0.94 wt% and 0.97 wt% B content. Further analysis using backscattered electron imaging indicates that reducing the B content effectively increases the quantity and uniformity of the rare earth-rich phase at grain boundaries. The increase in grain boundary phase weakens the magnetic exchange coupling between grains, enhancing the coercivity of the magnets. XRD analysis demonstrates that reducing the B content improves the orientation degree of the magnets. Microhardness analysis reveals that lowering the B content can effectively reduce the hardness of the magnets, thereby improving their machinability. The research findings of this study can provide theoretical guidance and technical support for the preparation of low-cost, high-performance Nd-Ce-Fe-B magnets.
文章引用：赵文强, 李柱柏, 陈夫刚. 硼含量对烧结钕铈铁硼磁体微观组织及磁性能的影响[J]. 材料科学, 2024, 14(6): 898-904. https://doi.org/10.12677/ms.2024.146101

参考文献

[1] Sagawa, M., Fujimura, S., Togawa, N., Yamamoto, H. and Matsuura, Y. (1984) New Material for Permanent Magnets on a Base of Nd and Fe (Invited). Journal of Applied Physics, 55, 2083-2087. [Google Scholar] [CrossRef] 
[2] 左思源, 李雅婧, 郑立允, 等. 热压/热变形钕铁硼永磁材料研究进展[J]. 中国稀土学报, 2024, 42(1): 1-12.
[3] 孔梦燃, 田晓, 王瑜, 等. 烧结钕铁硼磁体的组织结构及合金成分优化研究进展[J]. 材料导报, 2023, 37(S1): 321-329.
[4] Chen, H., Han, R., Qu, J., Yao, Y., Liu, J., Li, W., et al. (2020) Atomic Scale Insights into the Segregation/Partitioning Behaviour in As-Sintered Multi-Main-Phase Nd-Ce-Fe-B Permanent Magnets. Journal of Alloys and Compounds, 846, Article ID: 156248. [Google Scholar] [CrossRef] 
[5] Herbst, J.F. (1991) R2Fe14B Materials: Intrinsic Properties and Technological Aspects. Reviews of Modern Physics, 63, 819-898. [Google Scholar] [CrossRef] 
[6] Li, J., Sepehri-Amin, H., Sasaki, T., Ohkubo, T. and Hono, K. (2021) Most Frequently Asked Questions about the Coercivity of Nd-Fe-B Permanent Magnets. Science and Technology of Advanced Materials, 22, 386-403. [Google Scholar] [CrossRef] [PubMed]
[7] 李磊, 李燊昊, 张梦成, 等. 纳米Al及Cu65Ga35共掺杂对烧结钛钕硼磁体磁性能及热稳定性的影响[J]. 材料热处理学报, 2022, 43(5): 55-61.
[8] 刘仲武, 何家毅. 钕铁硼永磁晶界扩散技术和理论发展的几个问题[J]. 金属学报, 2021, 57(9): 1155-1170.
[9] 曹玉杰, 张鹏杰, 孙威, 等. 晶界扩散Tb对烧结NdFeB磁体耐蚀性的影响[J]. 磁性材料及器件, 2023, 54(4): 25-30.
[10] Chen, K., Guo, S., Fan, X.D., Ding, G.F., Di, J.H., Chen, R.J., et al. (2017) Coercivity Enhancement of (Nd,Ce)-Fe-B Sintered Magnets by Doping Nd-Fe Additives. AIP Advances, 7, Article ID: 025213. [Google Scholar] [CrossRef] 
[11] Jin, J., Tao, Y., Wang, X., Qian, Z., Chen, W., Wu, C., et al. (2022) Concurrent Improvements of Corrosion Resistance and Coercivity in Nd-Ce-Fe-B Sintered Magnets through Engineering the Intergranular Phase. Journal of Materials Science & Technology, 110, 239-245. [Google Scholar] [CrossRef] 
[12] Li, Z., Liu, W., Chen, H., Zhang, Z., Wu, D., Li, Y., et al. (2020) Effect of Inhibiting CeFe2 on Grain Boundary Diffusion of Ce/La-Ce Containing Nd-Fe-B Magnets. Materials Letters, 261, Article ID: 127017. [Google Scholar] [CrossRef] 
[13] Qian, R., Han, H., Chen, F., Sun, H., Zhao, Y., Zhang, P., et al. (2023) Improving the Magnetic Properties of Sintered Nd-Ce-Fe-B Magnets via Grain Boundary Diffusion with Pr60Tb10Cu30 Alloy. Intermetallics, 154, Article ID: 107818. [Google Scholar] [CrossRef] 
[14] 钟可祥. 硼含量对镓掺杂烧结钕铁硼微观结构及磁性能的影响[J]. 粉末冶金技术, 2022, 40(3): 204-210.
[15] Sasaki, T.T., Takada, Y., Okazaki, H., Ohkubo, T., Nakamura, T., Sato, T., et al. (2019) Role of Ga on the High Coercivity of Nd-Rich Ga-Doped Nd-Fe-B Sintered Magnet. Journal of Alloys and Compounds, 790, 750-759. [Google Scholar] [CrossRef] 
[16] Huang, Q., Jiang, Q., Zhong, K., Chen, D., Xu, D., Shi, D., et al. (2024) Effects and Regulation Mechanisms of Post-Sinter Annealing Treatment on Magnetic Properties and Microstructures of Nd-Fe-B Sintered Magnets with Varying Boron Contents. Journal of Materials Science & Technology, 181, 63-70. [Google Scholar] [CrossRef] 
[17] Mo, W., Zhang, L., Liu, Q., Shan, A., Wu, J. and Komuro, M. (2008) Dependence of the Crystal Structure of the Nd-Rich Phase on Oxygen Content in an Nd-Fe-B Sintered Magnet. Scripta Materialia, 59, 179-182. [Google Scholar] [CrossRef] 

为你推荐