Effect of Ce content on the magnetic properties and microstructure of sintered Nd-Ce-Fe-B magnets after Pr70Cu30 alloy diffusion

Effect of Ce content on the magnetic properties and microstructure of sintered Nd-Ce-Fe-B magnets after Pr70Cu30 alloy diffusion
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Ce含量对Pr70Cu30合金扩散后烧结Nd-Ce-Fe-B磁体磁性能和显微组织的影响

DOI:
10.1016/j.jallcom.2022.165661
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发表时间:
2022-05
影响因子:
6.2
通讯作者:
Wenqiang Zhao
Wenqiang Zhao
中科院分区:
材料科学2区
文献类型:
--
作者:
Fugang Chen;Hechang Han;Tieqiao Zhang;Yong Zhao;Xiaoli Wang;Wenqiang Zhao

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采用Pr 70 Cu 30合金对不同Ce含量(0wt%、5wt%、10wt%和15wt%)的烧结Nd-Ce-Fe-B磁体进行了晶界扩散工艺(GBDP)。原始磁体的磁电阻率为1053 kA/m(Ce:0重量%)、912 kA/m(Ce:5重量%)、915 kA/m(Ce:10重量%)和732 kA/m(Ce:15重量%)。在GBDP之后,电导率为1390 kA/m(Ce:0重量%)、1074 kA/m(Ce:5重量%)、937 kA/m(Ce:10重量%)和849 kA/m(Ce:15重量%)。与原始磁体相比,当Ce含量为0、5、10和15wt%时,经GBDP处理后,磁体的矫顽力增量分别为337 kA/m(32%)、162 kA/m(17.8%)、22 kA/m(2.4%)和117 kA/m(16%)。Ce替代Nd/Pr促进了扩散过程,但由于在磁体表面附近形成异常粗晶,使矫顽力增量降低。在GBDP之后,Ce 0、Ce 5、Ce 10和Ce 15磁体的剩磁增量分别为-0.01 T、0.02 T、0.04 T和0.05 T。Nd-Ce-Fe-B磁体的剩磁提高归因于磁体表面附近富Pr晶粒的形成和内部晶粒晶界处富Pr壳层的形成。研究结果表明,对于烧结Nd-Ce-Fe-B磁体,晶界双相效应对Ce含量敏感。
Grain boundary diffusion process (GBDP) with Pr70Cu30alloy was performed on sintered Nd-Ce-Fe-B magnets with different Ce contents (0 wt%, 5 wt%, 10 wt% and 15 wt%). The coercivities of the original magnets were 1053 kA/m (Ce: 0 wt%), 912 kA/m (Ce: 5 wt%), 915 kA/m (Ce: 10 wt%) and 732 kA/m (Ce: 15 wt%). After GBDP the coercivities were 1390 kA/m (Ce: 0 wt%), 1074 kA/m (Ce: 5 wt%), 937 kA/m (Ce: 10 wt%) and 849 kA/m (Ce: 15 wt%). Compared with the original magnets the coercivity increments were 337 kA/m (32%), 162 kA/m (17.8%), 22 kA/m (2.4%) and 117 kA/m (16%) for the magnets with Ce contents of 0 wt%, 5 wt%, 10 wt% and 15 wt%, respectively after GBDP. The Ce substitution for Nd/Pr promotes the diffusion process while the coercivity increment decreases due to the formation of abnormal coarse grains near the magnet surface. After GBDP the remanence increments were −0.01 T, 0.02 T, 0.04 T, 0.05 T for the Ce0, Ce5, Ce10 and Ce15 magnets, respectively. The improved remanence of the Nd-Ce-Fe-B magnets was attributed to the formation of Pr-rich grains near the magnet surface and the Pr-rich shells in the grain boundaries of the inner grains. The finding in this work reveals that for sintered Nd-Ce-Fe-B magnets the effect of GBDP is sensitive to the Ce content.
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