In this study, we focus on the short-process regeneration of high-Ce content sintered Nd-Ce-Fe-B magnet scraps, aiming to enhance the coercivity and overall magnetic properties through the reconstruction of grain boundaries (GBs) based on the analysis of rare earth (RE) loss and proportions at each stage of the regeneration process. CeH, (NdPr)H and their mixtures were added as intergranular additives to produce sintered magnets. When 2.31 wt% of (NdPr)H is added, a high-performance magnet is obtained with the remanence of 11.72 kG, coercivity of 11.56 kOe, and maximum energy product of 32.23 MGOe, reaching performance recovery rates of 98.8%, 103.5%, and 98%, respectively, of the original magnets. It is indicated that the intergranular additives were beneficial to the formation of continuous smooth RE-rich GBs. In addition, a portion of Nd/Pr diffused into the 2:14:1 phase as a partial replacement for Ce, resulting in the migration of Ce from the interior of the grains to the outer region. This led to the formation of new RE-rich triple junction phases on the exterior, thereby reducing the magnetic dilution effect of Ce in the primary phase and enhancing the magnetic crystal anisotropy. These findings offer new insights into the regeneration of high-Ce sintered Nd-Ce-Fe-B scraps.

中文翻译：

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晶界重构以实现高 Ce 丰度烧结 Nd-Ce-Fe-B 磁体废料的高性能再生

在本研究中，我们重点关注高Ce含量烧结Nd-Ce-Fe-B磁体废料的短流程再生，旨在通过基于分析的晶界（GB）重建来提高矫顽力和整体磁性能再生过程每个阶段的稀土 (RE) 损失和比例。添加 CeH、(NdPr)H 及其混合物作为晶间添加剂来生产烧结磁体。当(NdPr)H添加量为2.31 wt%时,得到的高性能磁体的剩磁为11.72 kG,矫顽力为11.56 kOe,最大磁能积为32.23 MGOe,性能恢复率分别为98.8%、103.5%,分别为原始磁铁的 98% 和 98%。结果表明，粒间添加剂有利于形成连续光滑的富稀土晶界。此外，一部分Nd/Pr扩散到2:14:1相中，部分替代Ce，导致Ce从晶粒内部迁移到外部区域。这导致在外部形成新的富稀土三结相，从而减少初生相中Ce的磁稀释效应并增强磁性晶体各向异性。这些发现为高 Ce 烧结 Nd-Ce-Fe-B 废料的再生提供了新的见解。