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Effects of grain boundary ternary alloy doping on corrosion resistance of(Ce,Pr,Nd)-Fe-B permanent magnets

Journal of Rare Earths 2021年第8期39卷 979-985页

作者： Xin Wang Minggang Zhu Feng Xi Meiling Zhang Fei Liu Yingjian Guo Lele Zhang Guangrui Zhang Wei Li Division of Functional Materials Central Iron&Steel Research InstituteBeijing 100081China School of Science Inner Mongolia University of Science&TechnologyBaotou 014010China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030China

To satisfy the application of different environments,grain boundary doping is commonly used in the preparation of sintered magnets to improve the coercivity and the corrosion *** this paper,the alloys were prepared by mixing different ratios of the master alloy(Ce,Pr,Nd)-Fe-B and the sintering aid(Pr,Nd)-*** coercivity of sintered(Ce,Pr,Nd)-Fe-B magnet is substantially enhanced by doping 2 wt%of(Pr,Nd)-Al,while the maximum energy product decreases *** systematically investigated the corrosion behavior and micro structure of the sintered magnets in order to determine the mechanism of the *** sintered(Ce,Pr,Nd)-Fe-B magnets with 2 wt% of(Pr,Nd)-Al addition exhibit the decreasing corrosion rate compared with others,due to the distribution of intergranular *** electrode potential difference between the main phase and the RE-rich phase is reduced by the addition of Al,improving the potential and stability of RE-rich phase due to the higher electrode potential of Al than that of Nd,Pr or *** addition,the element distribution of the magnets doped by(Pr,Nd)-Al indicates that the Al-rich shell formed at the marginal area of the Ce-rich phase improves its *** re,intergranular adding te rnary(Pr,Nd)-Al alloy powders results in both high coe rcivity and good corrosion resistance synchronously.

关键词： grain boundary doping Sintered(Ce,Pr,Nd)-Fe-B magnets (Pr,Nd)-Al Magnetic properties Corrosion resistance Rare earths

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