Coercivity enhancement of sintered Nd-Fe-B magnets by chemical bath deposition

The chemical bath deposition (CBD) method is used to diffuse the heavy rare earth element in order to obtain the high coercivity magnets with low heavy rare earth element. The jet mill powders are soaked in the alcohol suspension of Dy(CH3CHOHCH3)3 (Dy-ipa) so that Nd2Fe14B powder particles are surr...

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Published in:AIP advances 2018-05, Vol.8 (5), p.056220-056220-5
Main Authors: Zhang, Qiushuang, Guo, Shuai, Yang, Xiao, Zeng, Jiling, Cao, Xuejing, Chen, Renjie, Yan, Aru
Format: Article
Language:English
Subjects:
Coercivity
Deposition
Dysprosium
Grain boundaries
Grain boundary diffusion
Magnets
Neodymium
Organic chemistry
Rare earth elements
Remanence
Sintering (powder metallurgy)
Thermal stability
Trace elements
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cited_by cdi_FETCH-LOGICAL-c428t-e457fee85bbc96e4ce5bfb8eafec18a89fbc138a3ef8af7f44f134cf119c17393
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creator Zhang, Qiushuang
Guo, Shuai
Yang, Xiao
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Chen, Renjie
Yan, Aru
description The chemical bath deposition (CBD) method is used to diffuse the heavy rare earth element in order to obtain the high coercivity magnets with low heavy rare earth element. The jet mill powders are soaked in the alcohol suspension of Dy(CH3CHOHCH3)3 (Dy-ipa) so that Nd2Fe14B powder particles are surrounded by Dy-ipa homogeneously. By adding 1.0 wt. % Dy, the coercivity of magnet is increased from 14.47 kOe to 17.55 kOe with slight reduction of remanence after grain boundary diffusion (GBD) in the sintering and annealing processes. The temperature coefficient of coercivity optimizes from -0.629 %/°C to -0.605 %/°C as well as that of remanence improves from -0.108 %/°C to -0.100 %/°C. The CBD method is helpful for thermal stability and alignment either. The relation between the microstructure and the coercivity has been studied systematically.
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subjects Coercivity
Deposition
Dysprosium
Grain boundaries
Grain boundary diffusion
Magnets
Neodymium
Organic chemistry
Rare earth elements
Remanence
Sintering (powder metallurgy)
Thermal stability
Trace elements
title Coercivity enhancement of sintered Nd-Fe-B magnets by chemical bath deposition
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