正在加载图片...
.368. 北京科技大学学报 2006年第4期 Vater,.1998,189:55 [10]Wu Y Q.Kramer M J.Chen Z M.et al.Microstructural [8]Betancourt R J I.Davies H R.Magnetic properties of crys" control of Nb addition in nanocrystalline hard magnets with talline didymium (Nd Pr)Fe B alloys.J Appl Phys.1999. different Nd content.IEEE Trans Magn.2003.39(5): 85(8):5911 2935 [9]Chen Z M.Smith B R.Ma B M.Effect of Zr substitution for [11]Goll D.Seeger M.Kronmiller H.Magnetic and microstrue- rare earth on the thermal stability of melt-spun (Nd.Pr)Fe tural properties of nanocrystalline exchange coupled PrFeB B powder and magnets.IEEE Trans Magn.2002.38(5): permanent magnets.J Magn Magn Mater.1998.185:49 2976 Effects of Zr and Nb dopants on the microstructure and magnetic properties of Nd2Fe14B/a Fe nanocomposite ribbons ZOU Hanchang,ZHA NG Maocai,BAO Xiaoqian,GAO Xuexu,ZHOU Shouzeng State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing.Beijing 100083.China ABSTRACI The effects of Zr and Nb dopants on the microstructure and magnetic properties of exchange- coupling nanocomposite Nds.6oFe80.80Cuo.3Zr2-xNb:B8.30(x=0,1,2)ribbons were systematically studied. It is found that both Zr and Nb dopants can suppress the magnetic grain growth efficiently.The combina- tion of Zr and B consumes partial B and induces to the reduction N2Fe14B phases.Comparing to the effect of Zr addition,Nb addition can improve the squareness of the hysteresis loop and suppress the magnetic grain growth more effectively.The optimum magnetic properties were found in the annealed Nds.6oFe80.80Cuo.3 NbaB8.30 ribbons as the following:Br-0.89T,H-479.1kA'm,and (BH)-107.4kJm3. KEY WORDS nanocomposite magnets;dopant;microstructure;magnetic propertiesMater1998189：55 ［8］ Betancourt R J IDavies H R．Magnetic properties of crystalline didymium （Nd－Pr）－Fe－B alloys．J Appl Phys1999 85（8）：5911 ［9］ Chen Z MSmith B RMa B M．Effect of Zr substitution for rare earth on the thermal stability of melt-spun （NdPr）－Fe－ B powder and magnets．IEEE Trans Magn200238（5）： 2976 ［10］ Wu Y QKramer M JChen Z Met al．Microstructural control of Nb addition in nanocrystalline hard magnets with different Nd content．IEEE Trans Magn200339（5）： 2935 ［11］ Goll DSeeger MKronmüller H．Magnetic and microstructural properties of nanocrystalline exchange coupled PrFeB permanent magnets．J Magn Magn Mater1998185：49 Effects of Zr and Nb dopants on the microstructure and magnetic properties of Nd2Fe14B／α－Fe nanocomposite ribbons ZOU HanchangZHA NG MaocaiBAO XiaoqianGAO XuexuZHOU Shouzeng State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing100083China ABSTRACT The effects of Zr and Nb dopants on the microstructure and magnetic properties of exchangecoupling nanocomposite Nd8∙60Fe80∙80Cu0∙3Zr2－ xNb xB8∙30（ x＝012） ribbons were systematically studied． It is found that both Zr and Nb dopants can suppress the magnetic grain growth efficiently．The combination of Zr and B consumes partial B and induces to the reduction N2Fe14B phases．Comparing to the effect of Zr additionNb addition can improve the squareness of the hysteresis loop and suppress the magnetic grain growth more effectively．The optimum magnetic properties were found in the annealed Nd8∙60Fe80∙80Cu0∙3 Nb2B8∙30 ribbons as the following：Br＝0∙89THci＝479∙1kA·m －1and （BH）max＝107∙4kJ·m －3． KEY WORDS nanocomposite magnets；dopant；microstructure；magnetic properties ·368· 北 京 科 技 大 学 学 报 2006年第4期