氧含量对烧结钕铁硼磁体Dy晶界扩散的影响  被引量:6

Influence of Oxygen Content on Dy Grain Boundary Diffusion in Nd-Fe-B Sintered Magnets

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作  者:程星华 李建[2] 周磊[2] 刘涛[2] 喻晓军[2] 李波[1] Cheng Xinghua;Li Jian;Zhou Lei;Liu Tao;Yu Xiaojun;Li Bo(Central Iron and Steel Research Institute, Beijing 100081,China;Advanced Technology and Materials Co., Ltd, Beijing 101318,China)

机构地区:[1]钢铁研究总院,北京100081 [2]安泰科技股份有限公司,北京101318

出  处:《稀有金属材料与工程》2019年第6期2009-2013,共5页Rare Metal Materials and Engineering

基  金:安泰科技股份有限公司技术创新项目(2012JA01GGN)

摘  要:主要研究了烧结钕铁硼磁体中氧含量对Dy晶界扩散后的Dy含量及矫顽力的影响。比较了多种高、低氧磁体Dy扩散后的性能,发现低氧磁体的Dy扩散量和矫顽力提高量均明显高于高氧磁体。对9个0%Dy的不同氧含量样品进行扩散再次发现,氧含量减少有利于Dy扩散量、矫顽力的提高。渗透后的各样品Dy成分梯度结果显示,低氧磁体的Dy扩散量由表及里全面高于高氧磁体,内外浓度梯度也小于后者。电子探针表征结果表明,低氧磁体Dy扩散后晶界处Dy富集条纹更明显、连续,完整包裹各个主相晶粒。这种结构优化也使低氧磁体各向异性场提高幅度大于高氧磁体。这是因为磁体中氧含量降低使富钕相在主相周边均匀连续分布,为后续进入磁体内部的Dy元素提供连续的扩散通道,从而使磁体的Dy扩散量和矫顽力进一步提高。Influence of the oxygen content in sintered NdFeB magnets on the increase of Dy and coercivity after the grain boundary diffusion process(GBDP) was investigated. By comparing a variety of high and low oxygen magnets after GBDP, we find that the amount of Dy diffusion and the increments of coercivity of the low-oxygen magnets are significantly higher than those of the high-oxygen ones.Comparison of nine 0 wt% Dy samples with different oxygen contents proves that the decrease of oxygen content is beneficial to rise of Dy diffusion amount and coercivity. Dy content gradient analysis reveals that Dy amount gap between each layer is narrower in the low-oxygen ones. According to the EPMA figures, Dy-rich shells in the grain boundaries of the low-oxygen magnets are more continuous and brighter, and Dy almost completely surrounds each matrix grain. The optimization of the microstructure also enables the low-oxygen samples to possess more noticeable increment of anisotropic field in comparison to the high-oxygen ones. Decrease of oxygen leads to a phenomenon that Nd-rich phase surrounds the matrix phase more homogeneously and continuously, which provides a more continuous tunnel for Dy to diffuse into the magnet, thus improving Dy content and coercivity.

关 键 词:烧结钕铁硼 Dy蒸镀扩散 低氧磁体 Dy含量 矫顽力 

分 类 号:TM27[一般工业技术—材料科学与工程]

 

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