Towards the diffusion source cost reduction for NdFeB grain boundary diffusion process

Aiming at improving the performance/cost ratio in grain boundary diffusion process (GBDP), the critical RE containing Pr-Al-Cu alloy, less expensive RE containing La-Al-Cu alloy and non-RE Al-Cu alloy were employed as the diffusion sources. The preliminary results show that the coercivity was succes...

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Bibliographic Details
Published inJournal of materials science & technology Vol. 36; pp. 50 - 54
Main Authors Zeng, H.X., Liu, Z.W., Zhang, J.S., Liao, X.F., Yu, H.Y.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.01.2020
Subjects
Coercivity
Corrosion resistance
Cost reduction
Grain boundary diffusion
Microstructure
Corrosion resistance
Grain boundary diffusion
Microstructure
Cost reduction
Coercivity
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Summary:Aiming at improving the performance/cost ratio in grain boundary diffusion process (GBDP), the critical RE containing Pr-Al-Cu alloy, less expensive RE containing La-Al-Cu alloy and non-RE Al-Cu alloy were employed as the diffusion sources. The preliminary results show that the coercivity was successfully enhanced from 1000 kA/m to 1695, 1156 and 1125 kA/m by Pr70Al20Cu10, La70Al20Cu10 and Al75Cu25 (at.%) alloys diffusion, respectively, due to the formation of (Nd,Pr)-Fe-B, La2O3 and c-Nd2O3 phases respectively, after diffusion. It is also found that the corrosion resistance can be improved by Al-Cu diffusion due to the positive effects of Al and Cu elements in grain boundary. The present results demonstrated the various coercivity enhancement mechanisms for the GBDP based on different diffusion sources, and provided feasible solutions for cost reduction of GBDP and NdFeB production by saving RE resource.
ISSN:1005-0302
1941-1162
DOI:10.1016/j.jmst.2019.08.009