摘要
目的:研究Ce元素对MnBi基永磁体磁性能及其机制的影响,探究其微观结构演变规律,期望获得较高性能的MnBi基永磁材料。方法:通过控制变量法,采用熔体快淬和热处理技术制备Mn_(52) _(x)Bi_(48)Ce_(x)(x=0,1,2,3,4)薄带材料,探究Ce元素含量对MnBi磁性能、磁化行为及其微观结构的影响。结果:x=3薄带具有最佳磁性能,其H_(cj)=332 kA·m^(1),M_(s)=41.64 A·m^(2)·kg^(1),(BH)_(max)=18.23 kJ/m^(3),揭示MnBiCe基薄带微观结构和磁性能间的内在关联。结论:在磁性能方面,Ce元素会提高MnBi基永磁材料的磁性能,增加其高温应用潜力;在微观结构方面,Ce元素极大促进Mn和Bi元素均匀分布,增加MnBi铁磁性相含量,优化MnBi基永磁材料磁性能,对Heusler型MnBi永磁体的磁性能与微观结构更深层次的关联来讲具有重要的意义,可为新一代永磁体的发展提供一定的参考。
Aims: This paper aims to study the influence and mechanism of the Ce element on the magnetic properties of MnBi-based permanent magnets, explore the evolution law of its microstructure, and obtain high-performance MnBi-based permanent magnet materials. Methods: The Mn_(52) _(x)Bi_(48)Ce_(x)(x=0, 1, 2, 3, 4) ribbon material was prepared by rapid melt quenching and heat treatment by the controlled variable method;and the effect of rare earth content on the magnetic properties, magnetization behavior and microstructure of MnBi was investigated. Results: x=3 thin ribbon had the best magnetic properties, H_(cj)=332 kA·m^(1), M_(s)=41.64 A·m^(2)·kg^(1),(BH)_(max)=18.23 kJ/m^(3), revealing the microstructure of Ce-doped MnBi magnet’s intrinsic correlation between its structure and magnetic properties. Conclusions: In terms of magnetic properties, the Ce element can improve the magnetic properties of MnBi-based permanent magnet materials and increase its potential in high-temperature applications. In terms of microstructure, Mn and Bi elements are further uniformly distributed with the content of low-temperature phase increasesd. The optimization of the magnetic properties of permanent magnet material is of great significance for the deeper correlation between the magnetic properties of the Heusler-type MnBi permanent magnet and its microstructure. It provides a certain reference for the development of a new generation of permanent magnets.
作者
宋颖超
张朋越
俞能君
张素银
SONG Yingchao;ZHANG Pengyue;YU Nengjun;ZHANG Suyin(College of Materials and Chemistry,China Jjiliang University,Hangzhou 310018,China;College of Standardization,China Jiliang University,Hangzhou 310018,China)
出处
《中国计量大学学报》
2022年第2期256-264,共9页
Journal of China University of Metrology
基金
国家自然科学基金项目(No.51801196,51871205)。
关键词
MnBi
CE
微结构
磁性能
MnBi
Ce
microstructure
magnetic properties
