摘要
采用涂敷的方式,在烧结NdFeB磁体晶界扩散Tb_(70)Cu_(30)合金,研究磁体扩散前后磁性能及微观结构变化,并分析了磁体矫顽力及热稳定性的提升的机制。研究表明,扩散磁体经过810℃×6 h+490℃×3 h工艺处理后性能达到最优,矫顽力从17.37 kOe提升到20.04 kOe,剩磁和最大磁能积基本不下降。扩散磁体的矫顽力温度系数|β|由0.454%·℃^(-1)降为0.442%·℃^(-1),不可逆磁通损失低于原始磁体,表明扩散Tb_(70)Cu_(30)提高了烧结NdFeB磁体的热稳定性。微观结构分析得出,晶界扩散矫顽力提升的机制是形成高各向异性场的(Nd,Tb)_(2)Fe_(14)B核壳结构和连续分布富钕相,增加去磁耦合作用,使扩散磁体的矫顽力及热稳定性提高。
In this paper,sintered NdFeB magnet was diffused Tb_(70)Cu_(30)alloy by coating.The magnetic properties and microstructure of the magnet were studied.The mechanism of coercivity and thermal stability enhancement were analyzed.The study showed that the optimal diffusion temperature was 810℃,the coercivity increased from 17.37 kOe to 20.04 kOe,and the remanence and maximum magnetic energy product did not decrease basically.The coercivity temperature coefficient|β|of the diffused magnet decreased from 0.454%·℃^(-1) to 0.442%·℃^(-1).The flux irreversible loss was lower than that of the original magnet,and improved the thermal stability.The microstructure analysis showed that the(Nd,Tb)_(2)Fe_(14)B core-shell structure and continuous distribution of Nd-rich phase were formed.The increased demagnetization coupling significantly improved the coercivity and thermal stability of diffusion magnets.
作者
周头军
潘为茂
刘仁辉
屈鹏鹏
黎绵付
钟震晨
Zhou Toujun;Pan Weimao;Liu Renhui;Qu Pengpeng;Li Mianfu;Zhong Zhenchen(Jiangxi Key Laboratory far Rare Earth Magnetic Materials and Devices/Institute far Rare Earth Magnetic Materials and Devices(IREMMD),Jiangxi University of Science and Technology Ganzhou 341000,China;Ganzhou Qiandong Rare Earth Group Co.,Ltd.,Ganzhou 341000,China)
出处
《中国稀土学报》
CAS
CSCD
北大核心
2021年第6期903-908,I0002,共7页
Journal of the Chinese Society of Rare Earths
基金
江西省科技厅重点研发计划项目(20192ACB50022)
江西省教育厅项目(GJJ190481)资助。
关键词
烧结NDFEB
晶界扩散
矫顽力
核壳结构
热稳定性
sintered NdFeB
grain boundary diffusion
coercivity
core-shell structure
thermal stability
