镝扩散对烧结钕铁硼的磁性能影响研究
Effect of Dy Diffusion on Magnetic Properties in Nd-Fe-B Sintered Magnet
DOI: 10.12677/CMP.2018.74013, PDF,   
作者: 仉喜峰：爱科科技有限公司，山东 淄博
关键词: 烧结钕铁硼；晶界扩散；各向异性场；Sintered Nd-Fe-B； Grain Boundary Diffusion； Anisotropy Field
摘要: 烧结钕铁硼磁体需要在高温环境下工作，若要避免高温热退磁，则磁体需要具备极高的矫顽力。晶界扩散技术能用少量重稀土大幅增加矫顽力而剩磁基本不变。本研究对Nd31.6DyAl0.1FebalB磁体进行Dy蒸镀扩散，仅用0.33wt.%的Dy增加量使磁体矫顽力提高3.94 kOe。EPMA分析显示，磁体内部晶界相显著富集Dy元素。各向异性场分析结果显示，Dy扩散使磁体各向异性场提高了6.01 kOe，这是磁体矫顽力提高的主要原因。
Abstract: Nd-Fe-B is required to maintain stable performance in high temperature. In order to prevent thermal demagnetization, an extremely high coercivity of the magnet is required. Grain boundary diffusion could remarkably enhance the coercivity with little consumption of heavy rare earth, but hardly decrease the remanence. In the present work, Dy is diffused into the magnet with the nom-inal composition of Nd31.6DyAl0.1FebalB via vapor sorption method, and the coercivity is increased by 3.94 kOe whilst Dy is merely increased by 0.33 wt.%. The EPMA Dy mapping images show Dy is highly concentrated in intergranular phase. Further analysis shows that, Dy diffusion increased the anisotropic field by 6.01 kOe, which is the main driving force of coercivity enhancement.
文章引用：仉喜峰. 镝扩散对烧结钕铁硼的磁性能影响研究[J]. 凝聚态物理学进展, 2018, 7(4): 99-104. https://doi.org/10.12677/CMP.2018.74013

参考文献

[1] Satoh, H., Akutsu, A., Miyamura, T. and Shinoki, H. (2004) Development of Traction Motor for Fuel Cell Vehicle. SAE Technical Paper Series 2004-01-0567, SAE International, Warrendale.
[2] Sagawa, M., Fujimura, S., Yamamoto, H., Matsuura, Y. and Hiraga, K. (1984) Permanent Magnet Materials Based on the Rare Earth-Iron-Boron Tetragonal Compounds. IEEE Transactions on Magnetics, 20, 1584. [Google Scholar] [CrossRef] 
[3] Hirosawa, S., Yamaguchi, Y., Tokuhara, K., Yamamoto, H., Fujimura, S. and Sagawa, M. (1987) Magnetic Properties of Nd2(Fe1-xMx)14B Measured on Single Crystals (M =Al, Cr, Mn and Co). IEEE Transactions on Magnetics, 23, 2120. [Google Scholar] [CrossRef] 
[4] Hirota, K., Nakamura, H., Minowa, T. and Honshima, M. (2006) Coercivity Enhancement by the Grain Boundary Diffusion Process to Nd-Fe-B Sintered Magnets. IEEE Trans-actions on Magnetics, 42, 2909. [Google Scholar] [CrossRef] 
[5] Li, D., Suzuki, S., Kawasaki, T. and Machida, K. (2008) Grain Interface Modification and Magnetic Properties of Nd-Fe-B Sintered Magnets. Japanese Journal of Applied Physics, 47, 7876. [Google Scholar] [CrossRef] 
[6] Watanabe, N., Itakura, M., Kuwano, N., Li, D., Suzuki, S. and Machida, K. (2007) Microstructure Analysis of Sintered Nd-Fe-B Magnets Improved by Tb-Vapor Sorption. Materials Transactions, 48, 915. [Google Scholar] [CrossRef] 
[7] Govird, D. (1990) Experimental Approach to Coercivity Analysis in Hard Magnetic Materials. Journal of Magnetism and Magnetic Materials, 83, 183. [Google Scholar] [CrossRef] 
[8] 高汝伟, 姜寿亭, 李华, 丘梅影, 郭贻诚. 取向烧结钕铁硼永磁合金反磁化过程及矫顽力机理研究[J]. 物理学报, 1989(38): 439.
[9] Kronmuller, H. (1987) Theory of Nucleation Fields in Inhomogeneous Ferromagnets. Physica Status Solidi, 144, 385.

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