Fe-Co弥散分布的复相稀土永磁材料热变形磁织构形成机制及双相耦合作用

项目名称： Fe-Co弥散分布的复相稀土永磁材料热变形磁织构形成机制及双相耦合作用

项目编号： No.51274125

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 矿业工程

项目作者： 刘新才

作者单位： 宁波大学

项目金额： 80万元

中文摘要： 针对纳米晶复相稀土永磁块体材料研究中存在的两个问题：含一定量软磁相的复相永磁材料难以通过热变形使硬磁相获得磁织构、洁净的软磁相难以细小均匀化，项目采取氢等离子蒸发洁净的热强及高饱和磁化强度Ms的Fe-Co纳米粉、并将其分散后与微米富稀土永磁粉搅拌混匀、热压、热变形的技术路线，研究氢等离子蒸发Fe-Co纳米粉成分、粒度分布、软磁性能的影响规律，揭示含一定量Fe-Co纳米软磁相的复相稀土永磁材料中双相热变形组织演变过程及硬磁相磁织构形成机制，探索具有磁织构、高矫顽力的纳米晶硬磁相R2Fe14B与高Ms的纳米晶Fe-Co软磁相的交换耦合作用及其与纳米尺度双相界面成分、晶粒尺寸、软磁相弥散程度等多因素的关系，分析热变形强各向异性复相稀土永磁材料的宏观矫顽力特征。在从微观纳米尺度成分、取向到宏观交换耦合、矫顽力方面，探索复相稀土永磁材料的科学问题，积累复相纳米晶材料的热变形研究，项目具有积极意义。

中文关键词： Fe-Co纳米粉；稀土永磁材料；热变形；交换耦合；

英文摘要： In order to overcome the two principal technical difficulties in synthesizing bulk anisotropic nano-grain composite magnets, the technical route is taken in which clean Fe-Co nano-particles, are firstly evaporated by plasma arch, with both high strength at die-upset temperature and large saturation magnetization, the particles secondly are dispersed into colloidal solution and it is mechanically blended well with micron Nd-Fe-B particles with rich rare earth content, the blended particles are thirdly hot-pressed and then die-upset. The difficulties lie in both obtaining the magnetic texture in the composite rare earth magnets with 15~45vol% soft phase after deformation, and refining and dispersing its clean particles in them. The application project focuses on the following four problems: 1) the effects of plasma arch evaporation process parameters on the compositions, particle size distribution, and magnetic properties of the Fe-Co nano-particles; 2) the microstructure evolution and magnetic texture formation mechanism of the composite magnets during the die-upset process; 3) the exchange coupling between nano hard phase RE2Fe14B with both the high anisotropy and coercive force, and nano Fe-Co phase with high saturation magnetization, and the relationship between the coupling and the compositions of their two p

英文关键词： Fe-Co nanometer powder；rare earth permanent magnet；die-upset；exchange coupling；