Usually the improved coercivity of rare earth(RE)based 2∶14∶1-type permanent magnets via RE-rich in-tergranular additives is achieved at the cost of more corrosion channels and deteriorated corrosion re-sistance,which remains a challenging hurdle in the RE-Fe-B community.Distinctly,here we report the concurrent improvements of corrosion resistance and coercivity in 40 wt.％Ce-substituted Nd-Ce-Fe-B sintered magnets through engineering the intergranular phase using simple(Nd,Pr)Hx additive.The de-hydrogenated Nd/Pr changes the RE concentration gradients between 2∶14∶1 matrix and intergranular phases during sintering and enlarges the fraction of corrosion-resistant REFe2 phase,rather than the con-ventionally assumed Nd/Pr-rich intergranular phase with high chemical vulnerability.The spontaneous formation of REFe2 intergranular phase after(Nd,Pr)Hx addition generates the uniquely enhanced cor-rosion resistance against the hot/humid and acidic environments,and counts as one peculiar feature of Nd-Ce-Fe-B magnets at high Ce substitution level,being distinct from previously reported Ce-free/lean RE-Fe-B.Simultaneously,the formation of continuous grain boundaries enhances the coercivity from 8.7 to 12.5 kOe with trace addition of(Nd,Pr)Hx.Above findings may spur progress towards developing a high-performance Nd-Ce-Fe-B permanent magnet.

Jiaying Jin;Yongming Tao;Xinhua Wang;Zeyu Qian;Wang Chen;Chen Wu;Mi Yan

School of Materials Science and Engineering,State Key Laboratory of Silicon Materials,Key Laboratory of Novel Materials for Information Technology of Zhejiang Province,Zhejiang University,Hangzhou 310027,China

材料科学技术（英文版）

[1]Jiaying Jin;Yongming Tao;Xinhua Wang;Zeyu Qian;Wang Chen;Chen Wu;Mi Yan-.Concurrent improvements of corrosion resistance and coercivity in Nd-Ce-Fe-B sintered magnets through engineering the intergranular phase)[J].材料科学技术（英文版）,2022(15):239-245

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