摘要
通过磁控溅射进行钕铁硼磁体表面重稀土Tb镀膜,再经过渗扩热处理获得了综合性能近80[H_(cj)/kOe+(BH)_(max)/MGOe]的超高性能磁体,分析了其内在机制。借助扫描电镜背散射电子成像技术,研究了热处理温度对磁体磁性能和微观组织的影响,并探讨了晶界扩散法矫顽力提高的机理和微观结构变化规律。结果表明,经镀渗处理后磁体的矫顽力明显提高,剩磁无明显降低,温度稳定性得以显著改进,显微组织结构有了明显的优化,形成连续均匀薄层晶界富Nd相组织有效的包裹主相,能够有效降低相邻晶粒的磁耦合效应。Tb富集在2∶14∶1晶粒的表面区域而不是中心,不仅通过增强局部磁晶各向异性场来增加矫顽力,而且还保持了剩磁。
The surface of NdFeB magnet was coated with heavy rare earth Tb by magnetron sputtering,and then the ultra-high performance magnet with comprehensive performance of nearly 80[H_(cj)/kOe+(BH)_(max)/MGOe] was obtained by diffusion heat treatment.The internal mechanism was analyzed.The influence of heat treatment process on the microstructure and magnetic properties of magnets was studied by scanning electron microscope backscattering electron imaging technology,and the mechanism of coercivity improvement and microstructure evolution law were discussed.The results show that,the coercivity of the magnet after diffusion treatment is significantly improved,the remanence is not significantly reduced,the temperature stability is significantly improved,the microstructure is obviously optimized,and a more continuous and uniform Nd-rich phase structure is formed,which effectively inhibits the magnetic coupling effect of the main phase grains.Tb enrichment at the surface region rather than the center of 2∶14∶1 grains not only increases the coercivity by enhancing the local magnetocrystalline anisotropy field,but also maintains the remanence.
作者
赵苗苗
张敏刚
陈峰华
胡季帆
张葆华
郭敬东
Zhao Miaomiao;Zhang Mingang;Chen Fenghua;Hu Jifan;Zhang Baohua;Guo Jingdong(School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;Shanxi Institute of Electronic Science and Technology(Preparation),Linfen 041000,China;Shanxi Jinshan Magnetic Materials Co.,Ltd,Taiyuan 030008,China)
出处
《中国稀土学报》
EI
CAS
CSCD
北大核心
2024年第1期53-61,I0002,共10页
Journal of the Chinese Society of Rare Earths
基金
山西省重点研发计划项目(201903D121086)
山西先进永磁材料与技术协同创新中心项目(2019-01)资助。
关键词
烧结钕铁硼磁体
磁控溅射
晶界扩散
显微组织
磁性能
sintered NdFeB magnets
magnetrons puttering
grain boundary diffusion
microstructure
magnetic properties
