摘要
采用熔体快淬及晶化热处理工艺制备Nd10.1Fe(83.7-x-y)CoxZryB6.2纳米晶永磁材料。在快淬速度为18m·s-1时,经710℃/4min晶化处理后,Nd10.1Fe76Co5Zr2.7B6.2粘结磁体出现最佳磁性能,分别为Br=0.67T,JHc=754kA·m-1,(BH)max=75.1kJ·m-3。粘结磁体的磁性能对于快淬速度非常敏感。随着合金元素的添加,出现最佳磁性能的快淬速度逐渐减少。为了得到最佳磁性能,除了选择合适的快淬速度外,添加合适的合金元素变得非常重要。添加Zr元素抑制了亚稳相的析出以及细化了晶粒尺寸。比较不加Zr元素的Nd10.1Fe78.7Co5B6.2,添加Zr元素晶化温度增加了9℃,表明Zr元素也增加了快淬薄带的热稳定性。
Nanocrystalline Nd 10.1 Fe (83.7-x-y) CoxZryB 6.2 premantent materials were prepared by induction melt-spun with different wheel speed ranging from 16 to 28 m·s -1 in an argon atmosphere and then subsequent heat-treatment. Optimum magnetic properties of the Nd 10.1 Fe 76 Co5Zr 2.7 B 6.2 bonded magnet (vs=18 m·s -1 ) can be achieved after annealing the ribbons at 710 ℃ for 4 min, the remanence (Br), intrinsic coercivity(JHc) and maximum magnetic energy product ((BH) max ) are 0.6 T, 754 kA·m -1 and 75.1 kJ·m -3 , respectively. It is found that the magnetic properties of the bonded magnets are sensitive to the wheel speeds. The wheel speeds for optimum magnetic properties decrease with increasing the number of alloy elements. On the other hand, selecting of suitable alloy elements becomes very important for obtaining optimum magnetic properties. The reason of disappearance of metastable phase and reduction of the mean grain size is the addition of Zr element other than Co element. The crystallization temperature increases by 9 ℃ compared with the Zr free as-spun ribbons. Apparently the addition of Zr element also enhances the thermal stability of the ribbons.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2005年第3期295-298,共4页
Journal of the Chinese Society of Rare Earths
基金
国家高技术研究发展计划(2002AA302602-2)
上海市青年科技启明星项目(03QF14018)
上海市重点稀土材料开发及应用项目计划(03-111-54-05)
关键词
ND-FE-B
纳米晶
粘结磁体
磁性能
稀土
Nd-Fe-B
nanocrystalline
bonded magnets
magnetic properties
rare earths
