SmCox-0.4Ti0.4合金薄带的相结构和磁性能

张宇; 姚赞; 蒋成保

SmCo_x-0.4Ti_0.4合金薄带的相结构和磁性能

北京航空航天大学材料科学与工程学院, 北京 100191

详细信息

中图分类号: TG 111.92
计量
- 文章访问数: 2607
- HTML全文浏览量: 203
- PDF下载量: 1124
- 被引次数: 0
出版历程
- 收稿日期: 2007-08-30
- 网络出版日期: 2008-09-30

Phase structure and magnetic properties of SmCo_x-0.4 Ti_0.4 ribbons

School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

摘要

摘要: SmCo_x-0.4Ti_0.4(x=5.0, 5.5, 6.5, 7.0)合金经42 m/s速度甩带快速凝固制成薄带,在真空热处理炉中,进行750 ℃两小时热处理.对制得的甩带状态和热处理状态合金薄带分别测试其相结构和磁性能.结果表明:SmCo_x-0.4Ti_0.4合金甩带状态样品相结构随Co含量的不同而变化,其中x=5.0,5.5和6.5的合金样品由2∶ 17和1∶ 5两相结构组成;x=7.0成分样品由1∶ 7单相结构组成.甩带状态样品的比饱和磁化强度和比剩余磁化强度基本上线性增加,内禀矫顽力在合金成分为x=5.0时出现最大值,为1.01 T.薄带样品热处理前后均具有纳米晶结构,表现出剩磁增强效应.样品矫顽力机制主要为形核型,反磁化形核场主要来源于SmCo硬磁相大的磁晶各向异性及其纳米晶结构.热处理后,除x=7.0样品外,其余样品矫顽力均有所下降.
- 永磁材料 /
- SmCo合金 /
- 纳米晶 /
- 磁化强度 /
- 矫顽力
Abstract: SmCo_x-0.4Ti_0.4(x=5.0,5.5,6.5 and 7.0) ribbons were prepared by melt-spinning at a wheel speed of 42m/s, followed by annealing at 750℃ for 2 h.The phase structure and magnetic properties were measured for two types of ribbons, the as-spun and the as-spun/annealed. It was found that the phase structure of the as-spun ribbons changed with the Co content increasing. The as-spun samples with x=5.0, 5.5 and 6.5 showed a 1∶ 5 plus 2∶ 17 phase structure. The x=7.0 ribbons presented a single 1∶ 7 phase structure. The specific saturation magnetization and the specific remanence increased almost linearly with the increasing of Co content. The maximum intrinsic coercivity of 1.01 T was obtained in the as-spun ribbons with x=5.0. Both of the two types showed a fine nanograin microstructure, and leaded to the remanence enhancement. The coercivity mechanism of the ribbons was mainly of the nucleation type, and the reversal magnetization nucleation field arised from the high uniaxial magnetocrystalline anisotropy of the hard phases and the nanograin microstructures. The intrinsic coercivities decreased after annealing, except the sample with x= 7.0.
- permanent magnet /
- SmCo alloys /
- nanograin /
- magnetization /
- coercivity

HTML全文

参考文献(1)

[1] Jiang C B, Venkatesan M, Gallagher K,et al. Magnetic and structural properties of SmCo_7-xTi_xmagnets [J]. Journal of Magnetism and Magnetic Materials, 2001, 236: 49-55 [2] 周寿增.稀土永磁材料及其应用[M].北京:冶金工业出版社,1995:291-294 Zhou Shouzeng. Rare-earth permanent magnetic material and its application[M]. Beijing: Metallurgical Industry Press,1995:291-294 (in Chinese) [3] Wang Zuocheng, Zhang Maocai, Zhou Shouzeng, et al. Beneficial effects of Cu substitution on the micro-structures and magnetic properties of Pr₂(FeCo)₁₄B /α-(FeCo) nanocomposites[J]. Journal of Alloys and Compounds, 2000, 309: 212-218 [4] 李春和,戴雨兰,龙毅,等.新型钐钴永磁的高温性能和微观结构[J].中国稀土学报,2002,20:80-82 Li Chunhe, Dai Yulan,Long Yi, et al. High-temperature magnetic properties and microstructure of new magnet Sm(Co_balFe_0.2Cu_0.09Zr_0.0256)₇[J]. Journal of the Rare Earth Society,2002,20:80-82(in Chinese) [5] Chen X, Liu J F, Ni C, et al. Magnetic and structural properties of commercial Sm₂(Co,Fe,Cu, Zr)₁₇ based magnets[J]. Journal of Applied Physics, 1998, 83(11): 7139-7141 [6] 李卫,朱明刚.高性能稀土永磁材料及其关键制备技术[J].中国有色金属学报,2004,14:333-336 Li Wei, Zhu Minggang. High property rare-earth permanent magnetic materials and its pivotal preparation technique[J]. The Chinese Journal of Nonferrous Metals,2004,14:333-336(in Chinese) [7] Zhang Dongtao, Yue Ming, Zhang Jiuxing, et al.Bulk nanocrystalline SmCo_6.6Nb_0.4 sintered magnet with TbCu₇-type structure prepared by spark plasma sintering [J]. IEEE Transactions on Magnetics,2007, 43(8):3494-3496 [8] Venkatesan M, Jiang C B, Coey J M D. 1∶ 7-type magnets produced by mechanical milling[J].Journal of Magnetism and Magnetic Materials, 2002, 242-245: 1350-1352 [9] You C Y, Zhang Z D, Sun X K, et al. Phase transformation and magnetic properties of SmCo_7-xB_x alloys prepared by mechanical alloying[J].Journal of Magnetism and Magnetic Materials, 2001, 234:395-400 [10] Du X B, Zhang H W, Rong C B, et al. Magnetic properties and coercivity mechanism of melt-spun Sm (Co_1-xFe_x)_6.8Zr_0.2C_0.06 ribbons with TbCu₇structure [J]. Journal of Magnetism and Magnetic Materials, 2004, 281: 255-260 [11] Fernando M F Rhen, Venkatesan M, Harris I D, et al. Effect of ZrB₂ addition on SmCo-1∶ 7 high temperature magnets[J]. Journal of Applied Physics,2003,93(10):8683-8685 [12] 范雄. X射线衍射教程[M].北京:机械工业出版社,1998:119-122 Fan Xiong. X-ray diffraction course[M]. Beijing: China Machine Press,1998:119-112(in Chinese)

施引文献

资源附件(0)

访问统计