各向异性热压稀土永磁体的热变形机制及微磁结构研究  

Mechanism of hot-deformation and magnetic domains of anisotropic die-upset rare earth permanent magnets

作　　者：李卫[1] 朱明刚[1] 

机构地区：[1]钢铁研究总院功能材料研究所,北京100081

出　　处：《中国工程科学》2011年第10期4-12,27,共10页Strategic Study of CAE

基　　金：国家自然科学基金重点项目(50931001);国家重点基础研究发展计划973项目(2010CB934601);国家高技术研究发展计划重大项目(2010AA03A401)

摘　　要：重点研究制备工艺对各向异性热压稀土永磁体性能的影响,探讨了热压永磁体的热变形机理和数学描述模型,并尝试从微磁结构的角度研究各向异性纳米晶Nd-Fe-B磁体,揭示纳米晶粒之间的静磁和交换耦合相互作用、磁化和反磁化、热退磁等微观机制。获得了最佳磁性能为:Hcj=1 157 kA/m,Br=1.465 T,(BH)max=426 kJ/m3纳米晶Nd-Fe-B磁体。In this paper,high performance of anisotropic de-upset nanoscale Nd-Fe-B magnets is obtained： intrinsic coercivity Hcj=1 157 kA/m,remanence Br=1.465 T and maximum energy product（BH）max=426 kJ/m3.The fabrication procedure dependence,deformation mechanism and magnetic domains of these materials are discussed.It is found that the strain activation energy of the die-upset Nd-Fe-B magnets is about 380 kJ/mol based on the Arrhenius Model.The interaction domains are the typical characteristics of the magnetic structures of the magnets.And these domains play an important role in the coercivity mechanism and the corresponding maximum application temperature for the die-upset Nd-Fe-B magnets.

关 键 词：纳米晶Nd-Fe-B辐向环 热压-热变形 各向异性 微磁结构 

分 类 号：TM273[一般工业技术—材料科学与工程]