镝的分布对烧结和时效含镝钕铁硼永磁合金性能的影响（英文）  

Influence of Dysprosium Distribution on Properties of Sintered and Aged Dy-doped NdF e B Permanent Magnets

作　　者：王晓丽[1,2] 赵利娜[1] 丁开鸿 崔胜利 孙永聪 李木森[1] 

机构地区：[1]山东大学材料液固结构演变与加工教育部重点实验室,山东济南250061 [2]江苏科技大学,江苏镇江212003 [3]烟台首钢磁性材料有限公司,山东烟台265500

出　　处：《稀有金属材料与工程》2016年第2期309-314,共6页Rare Metal Materials and Engineering

基　　金：National Major Special Project for the Rare Earth and Rare Metallic Materials(2012-1743)

摘　　要：研究了烧结和时效含镝钕铁硼磁体。通过对不同状态磁体的磁滞曲线,场发射扫描电镜以及能谱对磁体的磁性能,微结构以及成分进行了分析。结果表明,除了主晶相外,镝元素主要分布在富钕相,钕镝氧化物和位于晶界的富镝颗粒中。优化时效过程促进了镝在磁体中合理的扩散以及分布,镝在烧结磁体,高温时效磁体以及优化时效磁体中富钕相,钕镝氧化物以及含镝颗粒中的含量减少,证明了优化时效后,镝元素在磁体中的合理分布,导致了含镝钕铁硼永磁合金矫顽力的提高。Sintered and aged Dy-doped NdF eB magnets were investigated. The magnetic properties, the microstructures and the compositions were characterized by hysteresis loop instrument, thermal field emission scanning electron microscopy（TFESEM） and energy disperse spectroscopy（EDS）, respectively. The results indicate that Dy element is mainly distributed in the Nd-rich phase, Nd-Dy oxides and Dy-rich particles located at the grain boundaries of the sintered magnets, in addition to the main crystal phase Nd2Fe（14）B. The optimized aging process is beneficial to promote a reasonable diffusion and distribution of Dy element. The Dy contents of Nd-riched phases, Nd-Dy oxide, and Dy-riched particle decrease successively in the sintered, the high temperature aged and the optimally two-stage aged Dy-doped NdF eB permanent magnets. The measurements demonstrate that the enhancement of the coercivity of the aged Dy-doped Nd FeB Magnet is caused mainly by the Dy element reasonable distribution.

关 键 词：含镝钕铁硼永磁合金 镝的分布 微结构 主晶相Nd2Fe14B 晶界相 

分 类 号：TG132.27[一般工业技术—材料科学与工程]