复合添加合金元素对纳米双相Nd_2Fe_(14)B/α-Fe永磁体微观结构和磁性能的影响  

Effect of Multiplex Alloying Elements on Microstructure and Magnetic Properties of Nanocomposite Nd_2Fe_(14)B/α-Fe Magnets

作　　者：白飞明[1] 姜忠良[1] 陈秀云[1] 马春来[1] 朱静[1] 

机构地区：[1]清华大学材料科学与工程研究院,北京100084

出　　处：《中国稀土学报》2002年第4期315-319,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金资助项目 (5 0 0 770 10 )

摘　　要：采用正交实验法系统地研究了复合添加合金元素Ga ,Nb ,Zr,Hf和Pr对纳米双相Nd9-xPrxFe86 .5-y -z -m -nGayNbzZrmHfnB4 .5(x =0 ,2 2 5 ;y ,z ,m ,n =0 .5 ,1.0 )快淬带微观结构和磁性能的影响。结果表明 :复合添加合金元素可以大大地降低Nd2 Fe1 4B和α Fe相的晶粒尺寸 ,并促使快淬带在低辊速下非晶化 ;在退火后样品带中 ,没有发现晶粒的不均匀长大 ,但大量添加合金元素会导致晶粒形貌不够理想。另一方面 ,由于各元素间的交互作用 ,复合添加合金元素使磁性能的变化规律非常复杂。实验发现 ,当Nb的含量为 0 .5 %时 ,增加Pr和Ga的添加量并降低Zr和Hf的添加量可以明显地改善磁性能。成分为Nd2 .2 5Pr6 .75Fe84 .5Ga1 .5Nb0 .5B4 .5的合金 ,在 15m·s- 1 辊速下获得的最佳磁性能为Jr=1.0 5 3T ,iHc=5 3 0 .9kA·m- 1 ,(BH) max=12 4kJ·m- 3。Effect of multiplex alloying elements, Ga, Nb, Zr, Hf and Pr, on the microstructure and magnetic properties of nanocomposite Nd 9- x Pr x Fe 86.5- y-z-m-n Ga y Nb z Zr m Hf n B 4.5 ( x =0, 2.25; y, z, m, n =0.5, 1.0) melt spun ribbons was investigated by the L 16 (2 15 ) orthogonal experiment. The results show that the addition of multiplex alloying elements can effectively reduce the grain size of Nd 2Fe 14 B and α Fe phases and promote amorphous phase to occur at low wheel speed. No inhomogeneous growth of grains was found in the after annealing ribbons, but a large amount of additives would result in the irregularity of Nd 2Fe 14 B and α Fe grains. On the other hand, the addition of multiplex alloying elements has complex effects on magnetic properties due to the interactions of alloying elements. When the content of Nb is 0.5%, increasing the content of Pr and Ga and decreasing the content of Zr and Hf can improve the magnetic properties effectively. The optimum magnetic properties were obtained in Nd 2.25 Pr 6.75 Fe 84.5 Ga 1.5 Nb 0.5 B 4.5 ribbons spun at 15 m·s -1 with J r=1.053 T, i H c=530.9 kA·m -1 , ( BH ) max =124 kJ·m -3 .

关 键 词：复合添加合金元素 Nd2Fe14B/α-Fe永磁体 微观结构 磁性能 稀土 纳米双相 快淬带 交互作用 钕铁硼 铁 

分 类 号：TM273[一般工业技术—材料科学与工程]