期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 726, 期 -, 页码 846-851出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.08.061
关键词
Sintered Nd-Fe-B magnets; Ni powders; Magnetic properties; Microstructure
资金
- National Natural Science Foundation of China [51401087, 51622104]
- China Postdoctoral Science Special Foundation [201104511]
- Natural Science Foundation of Fujian Province of China [2017J01477]
- project from the Research Starting-Foundation of Jiangsu University [10JDG030]
- Open Fund of Jiangsu Province Key Laboratory of Tribology [Kjsmcx2012002]
This paper aims to improve the magnetic properties of sintered Nd-Fe-B magnet. Ni powders were added to the Nd-Fe-B magnet through intergranular addition, and their effects on the microstructure and magnetic properties of the magnet were investigated. By adding a proper amount of Ni (0.3 wt%), the intrinsic coercivity H-cj of Nd-Fe-B magnet is significantly improved with only a slight decrease in the remanence B-r and the maximum energy product (BH)(max). The microstructural and compositional analyses reveal that Ni atoms not only enter the matrix phase but also concentrate in the intergranular regions either as Ni-containing Nd-rich phase or as Ni particles. This is consistent with the thermodynamic calculation results. Furthermore, a sintering mechanism of magnet with intergranular addition of Ni powders is tentatively proposed. These results may provide a reference for improving the magnetic properties of sintered Nd-Fe-B magnets. (C) 2017 Published by Elsevier B.V.
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