Oxide evolution in NdDy-Fe-B magnet during aging process |
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| Authors: | WANG Jingdai FENG Haibo LI Anhua LI Yanfeng ZHU Minggang LI Wei |
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| Affiliation: | (Division of Functional Materials, Central Iron and Steel Research Institute, Beijing 100081, China) |
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| Abstract: | Sintered NdDy-Fe-B magnets were made from strip cast flakes by powder metallurgy method. For the magnet with 6wt.% Dy substituted Nd, a remarkable coercivity increase of 70% was obtained after aging at 900°C for2 h and a high coercivity of23.5 kOe was achieved after aging at 520°C for2 h. The average diameter of the oxide particles decreased during the following 900°C aging treatment. Dy and O diffusion from oxide particles to Nd-rich phase during the aging process was observed. The oxide evolution and Dy element diffusion were helpful to the coercivity enhancement. |
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| Keywords: | permanent magnet aging dysprosium oxide coercivity rare earths |
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