热变形纳米晶Nd-Fe-B磁体2和5T时磁化强度与取向度的拟合关系式
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摘要
测量和分析了热压热变形各向异性纳米晶Nd-Fe-B磁体磁取向度I、整个磁体的易磁化轴与热变形压力方向的夹角α,磁体密度ρ,主相体积百分数1-β,磁化强度的关系,拟合出2和5 T充磁磁场时具有不同磁取向度热变形磁体的磁化强度分别为M S2=(1-β)M ST0ρ/ρ0(1-0.35108/I2+0.18622/I4)和M S5=(1-β)M ST0ρ/ρ0(1-0.19326/I2+0.09545/I4),并与已有相关文献的实验数据的测量值进行了计算比对,发现2和5 T充磁场时的计算值与实测值的误差分别在9.05%和0.89%。在1123~1163 K范围热变形,钕铁硼磁体的磁取向度、2和5 T时磁化强度均是先增加后减小,在1148 K时达到最大值1.894,1.337和1.386 T。消除热变形粗晶粒带和晶粒混乱区,将提高热变形磁体的磁取向度和磁化强度。
The orientation degree I,the angle α between the easy magnetization axis of the whole magnet with the die-upset stress direction,the magnet densityρ,the volume fraction of the main magnetic phase and the magnetization of the anisotropic nanocrystalline Nd-Fe-B were measured or analyzed. The fitting formulas between the magnetization and the orientation degree magetizing at 2 and 5 T,were M S2=( 1- β)M ST0ρ / ρ0( 1-0. 35108/I2+ 0. 18622 / I4) and M S5=( 1- β) M ST0ρ / ρ0( 1- 0. 19326/I2+ 0. 09545 / I4),respectiviely. The relative error was 9. 05% and0. 89% compared with the data of the related literatures. When the die-upset temperature was at 1123 ~1163 K,both the orientation degree and the magnetization of the magnets first increased and then decreased at 2 and 5 T. The maximum of the orientation degree and the magnetization was 1. 894,1. 337 and 1. 386 T respectively. If the coarse grain belts and disorientation areas were eliminated,the orientation degree and the magnetization would be improved.
The orientation degree I,the angle α between the easy magnetization axis of the whole magnet with the die-upset stress direction,the magnet densityρ,the volume fraction of the main magnetic phase and the magnetization of the anisotropic nanocrystalline Nd-Fe-B were measured or analyzed. The fitting formulas between the magnetization and the orientation degree magetizing at 2 and 5 T,were M S2=( 1- β)M ST0ρ / ρ0( 1-0. 35108/I2+ 0. 18622 / I4) and M S5=( 1- β) M ST0ρ / ρ0( 1- 0. 19326/I2+ 0. 09545 / I4),respectiviely. The relative error was 9. 05% and0. 89% compared with the data of the related literatures. When the die-upset temperature was at 1123 ~1163 K,both the orientation degree and the magnetization of the magnets first increased and then decreased at 2 and 5 T. The maximum of the orientation degree and the magnetization was 1. 894,1. 337 and 1. 386 T respectively. If the coarse grain belts and disorientation areas were eliminated,the orientation degree and the magnetization would be improved.
引文
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[16]李俊,刘新才,李明,潘晶.热变形温度对Nd14Fe80B6磁各向异性的影响[J].功能材料,2012,24(43):3377.Li J,Liu X C,Li M,Pan J.Effects of die-upset temperatures on magnetic anisotropy of Nd14Fe80B6[J].J.Funct.Mater.,2012,24(43):3377.
[2]于升学,陈玲.烧结型NdFeB永磁体锌铬膜处理工艺及性能研究[J].中国稀土学报,2006,24(1):65.Yu S X,Chen L.Property and technology of Zn-Cr coating on sintered NdFeB permanent magnet[J].J.Chin.Soc.Rare Earths,2006,24(1):65.
[3]Liu Z W,Huang H Y,Gao X X,Yu H Y,Zhong X C,Zhu J,Zeng D C.Microstructure and property evolution of isotropic and anisotropic NdFeB magnets fabricated from nanocrystalline ribbons by spark plasma sintering and hot deformation[J].J.Phys.D:Appl.Phys.,2011,44(025003):1.
[4]解振林,田薇,陈连生.钕铁硼永磁合金烧结过程中的晶粒聚集长大及对磁性能的影响[J].稀有金属材料与工程,2003,32(4):264.Xie Z L,Tian W,Chen L S.The grain aggregation and growth and its effect on the magnet property of the Nd-Fe-B permanent alloy in the sintering[J].Rare Met.Mater.Eng.,2003,32(4):264.
[5]蒋洪川,杨仕清,张万里,彭斌,张文旭,王豪才.NdFeB稀土永磁材料阻氢涂层的制备[J].中国稀土学报,2002,20(4):382.Jiang H C,Yang S Q,Zhang W L,Peng B,Zhang W X,Wang H C.Fabrication of hydrogen-resistant coatings for NdFeB rare rarth permanent magnet[J].J.Chin.Soc.Rare Earths,2002,20(4):382.
[6]胡伯平.钕铁硼稀土磁体产业发展及市场前景[J].磁性材料及器件,2012,43(6):1.Hu B P.Development of Nd-Fe-B rare earth magnet industry and market prospect[J].J.Magn.Mater.Devices,2012,43(6):1.
[7]Mishra R K,Panchanathan V,Croat J J.The microstructure of hot formed neodymium-iron-boron magnets with energy product 48MG Oe[J].J.Appl.Phys.,1993,73(10):6470.
[8]Ma B M,Lee D,Smith B,Gaiffi S,Owens B,Bie H,Warren G W.Comparison of the corrosion behavior of die-upset and sin-tered NdFeB magnets[J].IEEE Trans.Magn.,2001,37(4):2477.
[9]Yue M,Tian M,Zhang J X,Zhang D T,Zhang P L,Yang F.Microstructure and magnetic properties of anisotropic Nd-Fe-B magnets produced by spark plasma sintering technique[J].Mater.Sci.Eng.,B,2006,131:18.
[10]周寿增,董清飞.超强永磁体—稀土铁系永磁材料[M].北京:冶金工业出版社,2004.2.Zhou S Z,Dong Q F.Super Permanent Magnets RE-Iron Based Permanent Materials[M].Beijing:Metallurgical Industry Press,2004.2.
[11]潘晶.Nd2Fe14B晶粒取向程度对磁畴运动及磁性的影响规律[J].功能材料,1997,29(1):19.Pan J.ffects of grain orientation on the motion of magnetic domains and the magnetic properties of Nd2Fe14B[J].J.Funct.Mater.,1997,29(1):19.
[12]董正柱.低场下相对比饱和磁化强度与取向度的关系[J].磁性材料及器件,1993,24(2):13.Dong Z Z.The relationship between the relative specific saturation magnetization and orientation degree at low field[J].J.Magn.Mater.Devices,1993,24(2):13.
[13]Lin M,Wang H J,Yi P P.Effects of excessive grain growth on the magnetic and mechanical properties[J].J.Magn.Magn.Mater.,2010,322:2268.
[14]Liu W Q,Cui Z Z,Yi X F,Yue M,Jiang Y B,Zhang D T,Zhang J X,Liu X B.Structure and magnetic properties of magnetically isotropic and anisotropic anisotropic Nd-Fe-B permanent magnets prepared by spark plasma sintering technology[J].J.Appl.Phys.,2010,107(9):09A719.
[15]黄有林.各向同性与各向异性纳米晶Nd-Fe-B磁体的制备、组织和性能特征[D].广州:华南理工大学,2012.Huang Y L.Preparation,microstructure,and properties of isotropic and anisotropic nanocrystalline NdFeBbased Magnets[D].Guangzhou:South China University of Technology,2012.
[16]李俊,刘新才,李明,潘晶.热变形温度对Nd14Fe80B6磁各向异性的影响[J].功能材料,2012,24(43):3377.Li J,Liu X C,Li M,Pan J.Effects of die-upset temperatures on magnetic anisotropy of Nd14Fe80B6[J].J.Funct.Mater.,2012,24(43):3377.