分别采用物理气相沉积和快淬-氢爆工艺制备了Tb纳米粉和主相Nd_2Fe_(14)B磁性粉末, 研究了Tb纳米颗粒掺杂对烧结NdFeB永磁磁性能和微观结构的影响. 结果表明, 随着纳米Tb粉含量的增加, 磁体的矫顽力逐渐升高, 剩磁和磁能积则呈下降趋势. 显微组织研究表明, Tb元素富集在主相晶粒的边界层位置, 这种分布方式不仅有效地提高了磁体的矫顽力, 而且降低了Tb的添加量, 从而减小了Tb的添加对磁体剩磁及磁能积的负面影响.
Physical vapor deposition and melt-spinning hydrogen decrepitation technique were applied to prepare Tb nanoparticles and NdFeB powder, respectively. Microstructure and magnetic properties of the sintered NdFeB magnets with different content of Tb nano-particle addition were systematically studied. With the increase of Tb content in the magnets, the coercive force rose gradually, while the remanence of the magnets decreased. Microstructure observation showed that Tb distributed mainly in the boundaries of the crystal grains of the main phase. Such a distribution of Tb in the magnets improved the coercive force, reduced the consumption amount of Tb, and inhibited the side effect of Tb on remanence and maximum energy product of the magnets simultaneously.
参考文献
| [1] | 周寿增.超强永磁体-稀土铁系永磁材料[M].北京:冶金工业出版社,1999:573. |
| [2] | 孙绪新,周寿增.稀土永磁电机的开发与应用[J].磁性材料及器件,2005(05):22-24,35. |
| [3] | 马瑞,卢斌.Co/Nb复合添加对Nd2Fe14B/α-Fe纳米晶双相复合永磁体的影响[J].稀有金属,2009(01):22-25. |
| [4] | G. Bai;R.W. Gao;Y. Sun .Study of high-coercivity sintered NdFeB magnets[J].Journal of Magnetism and Magnetic Materials,2007(1):20-23. |
| [5] | Pandian S;Chandrasekaran V;Markandeyulu G;Lyer K J L Rao K V S R .Effect of Co,Dy and Ga on the magnetic properties and the microstructure of powder metallurgically processed Nd-Fe-B magnets[J].Journal of Alloys and Compounds,2004,364(1-2):295. |
| [6] | Hajime Nakamura;Koichi Hirota;Masanobu Shimao;Takehisa Minowa;Masakatsu Honshima .Magnetic Properties of Extremely Small Nd-Fe-B Sintered Magnets[J].IEEE Transactions on Magnetics,2005(10):3844-3846. |
| [7] | Natsuki Watanabe;Masaru Itakura;Noriyuki Kuwano .Microstructure Analysis of Sintered Nd-Fe-B Magnets Improved by Tb-Vapor Sorption[J].Materials transactions,2007(5):915-918. |
| [8] | Hirosawa S;Matsuura Y;Yamamoto H;Fujimura S Sagawa M .Magnetization and magnetic anisotropy of R_2Fe_(14)B Measured on single crystals[J].Journal of Applied Physics,1986,59:873. |
| [9] | 曹爱利 .稀土纳米颗粒掺杂烧结高性能NdFeB永磁的研究[D].北京:北京工业大学,2007. |
| [10] | 高汝伟,王标,刘汉强,韩广兵,白岗,孙艳,刘涛.高性能烧结钕铁硼磁体的研究与开发（二）[J].磁性材料及器件,2005(01):1-5. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%