首页|Enhanced magnetic properties and thermal stability of spark plasma sintered multi-main-phase Nd-Ce-Fe-B magnet via co-adding DyF3 and Cu
Enhanced magnetic properties and thermal stability of spark plasma sintered multi-main-phase Nd-Ce-Fe-B magnet via co-adding DyF3 and Cu
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NSTL
Elsevier
Low coercivity and poor thermal stability are still the main challenges for practical application of low-cost Nd-Ce-Fe-B magnet. To solve these challenging problems, a strategy to simultaneously improve the coercivity and thermal stability of Nd-Ce-Fe-B magnet through combining the nanocrystalline multi-main-phase (MMP) structure and grain boundary engineering is demonstrated. In this study, nanocrystalline MMP Nd-Ce-Fe-B magnet was grain boundary engineered by co-adding DyF3 and Cu powders. The results show that the intrinsic coercivity Hcj is significantly improved, and meanwhile optimum maximum energy product (BH)max is achieved at 2 wt% DyF3-Cu. Moreover, the superior reversible temperature coefficients of Hcj (β) and Br (α) are both achieved, implying the improved thermal stability for the DyF3-Cu added magnet. Microstructural and compositional characterizations indicate that the modified RE-rich phase, the inhibited abnormal grain growth near the flake boundary, and the diffused Dy towards main phase grains are the main reasons for simultaneously enhanced magnetic properties and thermal stability. Thus, combining the nanocrystalline MMP structure and grain boundary engineering will be a promising approach for preparing thermally-stable high-performance Nd-Ce-Fe-B magnet.
Cu powdersDyF3 powdersMagnetic propertiesMicrostructureMulti-main-phase Nd-Ce-Fe-B magnetsThermal stability
Cui X.G.、Shu G.Y.、Pan J.X.、Zhang J.、Liang W.J.、Cui C.Y.、Zhao Z.H.、Ma T.Y.、Zhao L.Z.、Peng X.L.、Li J.
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School of Mechanical Engineering Jiangsu University
Multi-Disciplinary Materials Research Center Frontier Institute of Science and Technology Xi'an Jiaotong University
Institute of Advanced Magnetic Materials College of Materials & Environmental Engineering Hangzhou Dianzi University
College of Materials and Chemistry China Jiliang University
NSTL
Elsevier
