Influence of zirconium addition on microstructure, magnetic properties and thermal stability of nanocrystalline Nd_(12.3)Fe_(81.7)B_(6.0) alloy
来源期刊：JOURNAL OF RARE EARTHS2009年第5期
论文作者：GAO Xuexu ZHU Jie LI Wei ZHOU Shouzeng BAO Xiaoqian
Key words：nanocrvstaUine Nd-Fe-B magnets; magnetic properties; thermal stability; microstructure; rare earths;
Abstract: Effect of Zr addition on microstructure, magnetic properties and thermal stability of Nd_(12.3)Fe_(81.7)B_(6.0) (x=0-3.0) ribbons melt-spun and annealed was investigated. Magnetic measurement using vibrating sample magnetometer (VSM) revealed that Zr addition was significantly effective in improving the magnetic properties at room temperature. The intrinsic coercivity Hci of the optimally processed rib-boris increased monotonically with increasing Zr content, from 751.7 kA/m for x=0 to 1005.3 kA/m for x=3.0. Unlike the coercivity, the re-manence polarization Jr increased first with Zr addition, from 0.898 T up to 1.041 T at x=1.5, and then decreased with further Zr addition.The maximum energy product (BH)max behaved similarly, increasing from 103.1 KJ/m~3 to a maximum of 175.2 kJ/m~3 at x=1.5. Microstruc-ture studies using atomic force microscopy (AFM) and transmission electron microscopy (TEM) had shown a significant microstructttre re-finement with Zr addition. The absolute values of temperature coefficients of induction and coercivity were significantly increased with in-creasing Zr content, indicating that Zr was detrimental to thermal stability of the melt-spun Nd2Fe14B-type material.
GAO Xuexu1，ZHU Jie1，LI Wei2，ZHOU Shouzeng1，BAO Xiaoqian1
(1.State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;
2.College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, China)
Abstract:Effect of Zr addition on microstructure, magnetic properties and thermal stability of Nd_(12.3)Fe_(81.7)B_(6.0) (x=0-3.0) ribbons melt-spun and annealed was investigated. Magnetic measurement using vibrating sample magnetometer (VSM) revealed that Zr addition was significantly effective in improving the magnetic properties at room temperature. The intrinsic coercivity Hci of the optimally processed rib-boris increased monotonically with increasing Zr content, from 751.7 kA/m for x=0 to 1005.3 kA/m for x=3.0. Unlike the coercivity, the re-manence polarization Jr increased first with Zr addition, from 0.898 T up to 1.041 T at x=1.5, and then decreased with further Zr addition.The maximum energy product (BH)max behaved similarly, increasing from 103.1 KJ/m~3 to a maximum of 175.2 kJ/m~3 at x=1.5. Microstruc-ture studies using atomic force microscopy (AFM) and transmission electron microscopy (TEM) had shown a significant microstructttre re-finement with Zr addition. The absolute values of temperature coefficients of induction and coercivity were significantly increased with in-creasing Zr content, indicating that Zr was detrimental to thermal stability of the melt-spun Nd2Fe14B-type material.
Key words:nanocrvstaUine Nd-Fe-B magnets; magnetic properties; thermal stability; microstructure; rare earths;
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