Preparation and magnetic properties of anisotropic bulk MnBi/NdFeB hybrid magnets

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:411

Article

Ma, Y. L.^1,2  Liu, X. B.¹  Nguyen, V. V.¹  Poudyal, N.¹  Yue, M.³  Liu, J. P.¹ 

[1] Univ Texas Arlington, Dept Phys, POB 19059, Arlington, TX 76019 USA

[2] Chongqing Univ Sci & Technol, Coll Met & Mat Engn, Chongqing 401331, Peoples R China

[3] Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China

关键词: Permanent magnets;    Hybrid magnets;    Magnetic anisotropy;    Sintering;    Thermal stability;   

DOI  :  10.1016/j.jmmm.2016.03.063

来源: Elsevier

【 摘 要 】

Anisotropic hybrid bulk magnets of MnBi/NdFeB with different composition ratio have been prepared with starting MnBi and Nd2Fe14B powders as well as epoxy resin as a binder in case it is needed to form bulk samples. It has been found that the ratio between the two phases in content has a remarkable influence on the magnetic properties, the thermal stability and the density of the bulk magnets. With increasing MnBi content the binder addition can be reduced. When the MnBi content is larger than 30 wt%, no binder is needed. On the other hand, the coercivity and saturation magnetization were increased significantly with increasing NdFeB content. When the NdFeB content was increased from 0% to 50%, the maximum energy product was enhanced from 4.7 to 10.0 MGOe, respectively. The energy product then decreased gradually with the NdFeB content due to the reduced density of the hybrid magnet. The thermal stability measurements showed that the temperature coefficient of coercivity grew with the MnBi content and became positive with MnBi=80 wt%. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free