镝扩散对烧结钕铁硼的磁性能影响研究  

Effect of Dy Diffusion on Magnetic Properties in Nd-Fe-B Sintered Magnet

作　　者：仉喜峰 

机构地区：[1]爱科科技有限公司,山东淄博

出　　处：《凝聚态物理学进展》2018年第4期99-104,共6页Advances in Condensed Matter Physics

摘　　要：烧结钕铁硼磁体需要在高温环境下工作,若要避免高温热退磁,则磁体需要具备极高的矫顽力。晶界扩散技术能用少量重稀土大幅增加矫顽力而剩磁基本不变。本研究对Nd31.6DyAl0.1FebalB磁体进行Dy蒸镀扩散,仅用0.33wt.%的Dy增加量使磁体矫顽力提高3.94 kOe。EPMA分析显示,磁体内部晶界相显著富集Dy元素。各向异性场分析结果显示,Dy扩散使磁体各向异性场提高了6.01 kOe,这是磁体矫顽力提高的主要原因。Nd-Fe-B is required to maintain stable performance in high temperature. In order to prevent thermal demagnetization, an extremely high coercivity of the magnet is required. Grain boundary diffusion could remarkably enhance the coercivity with little consumption of heavy rare earth, but hardly decrease the remanence. In the present work, Dy is diffused into the magnet with the nom-inal composition of Nd31.6DyAl0.1FebalB via vapor sorption method, and the coercivity is increased by 3.94 kOe whilst Dy is merely increased by 0.33 wt.%. The EPMA Dy mapping images show Dy is highly concentrated in intergranular phase. Further analysis shows that, Dy diffusion increased the anisotropic field by 6.01 kOe, which is the main driving force of coercivity enhancement.

关 键 词：烧结钕铁硼 晶界扩散 各向异性场 

分 类 号：TM2[一般工业技术—材料科学与工程]