CAJ | 학술논문

对比研究了38UH、42SH 和 N50薄片状钕铁硼磁体晶界镝扩渗前后的组织结构与磁性能，发现经过镝扩渗处理后磁体的矫顽力提高了400 kA·m -1以上，而剩磁几乎不变，最大磁能积因为矫顽力和方形度的提高而提高。经组织结构分析认为，钕铁硼磁体晶界镝扩渗提高矫顽力主要是通过提高 Nd2 Fe14 B 晶粒外延层的各向异性和形核场实现的。根据 Fick 第一扩散定律，对磁体晶界镝扩渗进行了模拟计算，可近似得到定温热处理不同时间后渗镝深度及对应的镝的质量浓度及质量分数。
대비연구료38UH、42SH 화 N50박편상녀철붕자체정계적확삼전후적조직결구여자성능，발현경과적확삼처리후자체적교완력제고료400 kA·m -1이상，이잉자궤호불변，최대자능적인위교완력화방형도적제고이제고。경조직결구분석인위，녀철붕자체정계적확삼제고교완력주요시통과제고 Nd2 Fe14 B 정립외연층적각향이성화형핵장실현적。근거 Fick 제일확산정률，대자체정계적확삼진행료모의계산，가근사득도정온열처리불동시간후삼적심도급대응적적적질량농도급질량분수。
The microstructure and magnetic properties of 38UH, 42SH and N50 magnets with and without Dy diffusion treatment were contrastively investigated. The intrinsic coercivity of the magnets by Dy diffusion increases over 400 kA·m - 1 correspondingly but the remanence shows little decrease. The maximum energy product enhances with the increases in intrinsic coercivity and square degree. The evident enhancement of the intrinsic coercivity of the magnets results from the increases in magnetic anisotropy and nuclea-tion field of the extensive layer of Nd2 Fe14 B grains. Based on the Fick’s first law, the depth, mass concentration and mass fraction of Dy element with process time at a certain temperature can be approximately calculated.