第1期 隋延力等:Dy对NdeB永磁合金各向异性的影响 ,77 由X射线衍射谱可以看出,取向样品中仍然存 (1):1388 在105晶面的衍射峰,说明本实验的多晶取向样品 [4]Fang X.Shi Y,Jiles DC.Modeling of magnetic properties of 的取向度不是100%.这一点从图3的磁化曲线也 heat treated Dy-doped NdFeB particles bonded in isotropic and anisotropic arrangements.IEEE Trans Magn.1998.34(4): 可以看出:⊥c的磁化曲线不完全是直线;∥c的磁 1291 化曲线在达到饱和磁化之前有较大的过渡区,即逐 [5]Sagawa M.Hirosawa S.Tokuhara K.Dependence of coercivity 渐达到饱和的弯曲区,这是铸态粉末的℃轴与磁场 on the anisotropic field in the Nd2FeiB-type sintered magnets. 取向场方向不完全平行,部分粉末颗粒的c轴与磁 Appl Phys,1987,61(8):3559 场取向轴存在一定夹角造成的,用取向不完全的样 [6]Kim S G.Kim M J.Ryu K S.et al.Effect of Dy on magnetic properties of Fe/NdaFeB type alloy.IEEE Trans Magn. 品的⊥c和∥c的磁化曲线相交点对应的磁场来确 1999,36(5):3316 定HA,其数值有可能偏高, [7]Pandian S.Chandrasekaran V.Markandeyulu G.et al.Effect of 4结论 Co.Dy and Ga on the magnetic properties and the microstructure of powder metallurgically processed Nd-Fe-B magnets.JAlloys (1)在Nd2Fe14B合金中,用Dy部分取代Nd, Compd,2004,364:295 可以大大提高矫顽力,Nd2.3-xDyxFe79.7Nbo.8Zrm.8 [8]Miao W F,Ding J.Me Cormick P G.et al.Magnetic behaviour of mechanically milled Ndi-x Dy:)8Fe8s B.J Magn Magr Cu0.4B6合金的HA,从x=0的4900kAm-1大幅提 Maer,1997,175:304 高到x=2.5的7500kAm1 [9]Goralez J M.de Julian C.Cebollada F,et al.Phase segregation (2)Dy部分取代Nd,与稀土体积分数大的合 and interactions in Dy-substituted melt spun Nd-Fe-B alloys IEEE Trans Magn.1995.31(6):3683 金相比,稀土体积分数少的合金更有利于提高HA· [10]Harland CL.Davies HA.Magnetic properties of melt-spun Nd- (3)取向样品的取向度越高,用⊥c和∥c磁化 rich NdFeB alloys with Dy and Ga substitutions.JAlloys Com 曲线交点确定的HA越准确, pd,1998,281:37 [11]Ma B M.Krause R F.Proc.microstructure and magnetic prop" 参考文献 erties of sintered Nd-Dy-Fe-B magnets//5th International Sym- [1]Jang T.Kim Y S.Effect of small dysprosium additions on the co- posium on Anisotropy and Coercivity in Rare-Earth Transition ercivity of melt-spun Nd-Fe-C alloys.IEEE Trans Magn.1999. Metal Alloys Deutsche.Physikalische:FRG.1987:141 36(5):3310 [12]Bai F M,Jiang Z L.Chen X Y,et al.The combined effect of [2]Yu L Q.Wen Y H.Yan M.Effects of Dy and Nb on the mag- Ga.Nb.Zr.Hf.Pr on the magnetic properties and microstruc- netic properties and corrosion resistance of sintered Nd-Fe-B.J ture of (Nd,Pr)9(Fe,Ga.Nb.Zr.Hf)86.5B4.5 nanocomposite rib- Magn Magn Mater,2004.283:353 hons.J Alloys Compd.2002.343:60 [3]de Groot C H.Buschow K HJ.de Boer F R.et al.Two powder [13]Chang WC.WuT B.Liu K S.A Texture Study of Anisotropic NdzFeuB magnets with DyGa addition.JAppl Phys.1998.83 Sintered Nd-Fe-B Magnets.JAppl Phys.1988.63:3531由 X 射线衍射谱可以看出取向样品中仍然存 在105晶面的衍射峰说明本实验的多晶取向样品 的取向度不是100%.这一点从图3的磁化曲线也 可以看出:⊥c 的磁化曲线不完全是直线;∥c 的磁 化曲线在达到饱和磁化之前有较大的过渡区即逐 渐达到饱和的弯曲区.这是铸态粉末的 c 轴与磁场 取向场方向不完全平行部分粉末颗粒的 c 轴与磁 场取向轴存在一定夹角造成的.用取向不完全的样 品的⊥c 和∥c 的磁化曲线相交点对应的磁场来确 定 HA其数值有可能偏高. 4 结论 (1) 在 Nd2Fe14B 合金中用 Dy 部分取代 Nd 可以大大提高矫顽力.Nd12∙3-xDy xFe79∙7Nb0∙8Zr0∙8- Cu0∙4B6合金的 HA从 x=0的4900kA·m -1大幅提 高到 x=2∙5的7500kA·m -1. (2) Dy 部分取代 Nd与稀土体积分数大的合 金相比稀土体积分数少的合金更有利于提高 HA. (3) 取向样品的取向度越高用⊥c 和∥c 磁化 曲线交点确定的 HA 越准确. 参 考 文 献 [1] Jang TKim Y S.Effect of small dysprosium additions on the coercivity of melt-spun Nd-Fe-C alloys.IEEE T rans Magn1999 36(5):3310 [2] Yu L QWen Y HYan M.Effects of Dy and Nb on the magnetic properties and corrosion resistance of sintered Nd-Fe-B.J Magn Magn Mater2004283:353 [3] de Groot C HBuschow K H Jde Boer F Ret al.Two-powder Nd2Fe14B magnets with DyGa addition.J Appl Phys199883 (1):1388 [4] Fang XShi YJiles D C.Modeling of magnetic properties of heat treated Dy-doped NdFeB particles bonded in isotropic and anisotropic arrangements.IEEE T rans Magn199834(4): 1291 [5] Sagawa MHirosawa STokuhara K.Dependence of coercivity on the anisotropic field in the Nd2Fe14B-type sintered magnets.J Appl Phys198761(8):3559 [6] Kim S GKim M JRyu K Set al.Effect of Dy on magnetic properties of α-Fe/Nd2Fe14B type alloy. IEEE T rans Magn 199936(5):3316 [7] Pandian SChandrasekaran VMarkandeyulu Get al.Effect of CoDy and Ga on the magnetic properties and the microstructure of powder metallurgically processed Nd-Fe-B magnets.J Alloys Compd2004364:295 [8] Miao W FDing JMc Cormick P Get al.Magnetic behaviour of mechanically milled ( Nd1- x Dy x )8Fe88B4. J Magn Magn Mater1997175:304 [9] Gonz′alez J Mde Juli′an CCebollada Fet al.Phase segregation and interactions in Dy-substituted melt spun Nd-Fe-B alloys. IEEE T rans Magn199531(6):3683 [10] Harland C LDavies H A.Magnetic properties of melt-spun Ndrich NdFeB alloys with Dy and Ga substitutions.J Alloys Compd1998281:37 [11] Ma B MKrause R F.Proc.microstructure and magnetic properties of sintered Nd-Dy-Fe-B magnets∥5th International Symposium on A nisotropy and Coercivity in Rare-Earth T ransition Metal Alloys Deutsche.Physikalische:FRG1987:141 [12] Bai F MJiang Z LChen X Yet al.The combined effect of GaNbZrHfPr on the magnetic properties and microstructure of (NdPr)9(FeGaNbZrHf)86∙5B4∙5nanocomposite ribbons.J Alloys Compd2002343:60 [13] Chang W CWu T BLiu K S.A Texture Study of Anisotropic Sintered Nd-Fe-B Magnets.J Appl Phys198863:3531 第1期 隋延力等: Dy 对 NdFeB 永磁合金各向异性的影响 ·77·