双主相混合稀土基RE-Fe-B磁体的磁性能和抗腐蚀性改进
Enhancement of Magnetic Properties and Corrosion Resistance for Misch Metal Based RE-Fe-B Magnets Prepared by Double Main Phase Process
连昕丽 1周建军 2李仕林 1赵院红 1王长鹏 1王印 1刘飞 1章明 1左建华 1白锁 1刘艳丽 1李柱柏 3李永峰1
作者信息
- 1. 内蒙古科技大学理学院,内蒙古包头 014010
- 2. 内蒙古科技大学理学院,内蒙古包头 014010;中科院赣江创新研究院,江西 赣州 341000
- 3. 内蒙古科技大学材料与冶金学院,内蒙古包头 014010
- 折叠
摘要
为了实现稀土资源的平衡应用且降低RE-Fe-B稀土永磁材料的价格,针对混合稀土基永磁材料进行研究,分别采用单、双主相工艺制备了名义成分[(Pr,Nd)1-xMMx]30.3(Fe,Co)halM0.73B0.98(x=0.3,0.5和0.7,质量分数)的磁体,对比研究其磁性能和抗腐蚀性.研究发现:双主相工艺制备的磁体相比单主相工艺制备的同成分磁体展现了优越的磁性能和抗腐蚀性.当x=0.5,双主相磁体的磁性能为Br=1.308 T,Hcj=799.98 kA/m和(BH)max=325.6436 kJ/m3,远高于同成分的单主相磁体的性能(Br=1.297T,Hcj=746.8868 kA/m 和(BH)max=317.8428 kJ/m3).这种改进源于富稀土相分布的改进以及主相晶粒间和晶粒内部耦合作用的增强.当双主相磁体暴露在湿热环境下时,磁体中不仅存在富稀土相腐蚀,也存在主相晶粒的腐蚀成粉现象,这主要是由于富稀土相与水蒸气和氧气反应时产生氢气,导致主相晶粒被氢化,由于主相晶粒间和晶粒内部的镧铈分布差异,产生大的应力,导致其表现出区别于单主相磁体的腐蚀行为.
Abstract
In order to reduce the RE-Fe-B material cost and to balance the utilization of rare earth sources,[(Pr,Nd)1-xMMx]30.3(Fe,Co)bal-M0.73B0.98(x=0.3,0.5,0.7,wt％)magnets were prepared by double main phase(DMP)and single main phase(SMP)processes.DMP magnets are superior to SMP magnets with the same nominal composition in magnetic properties and corrosion resistance.For x-0.5,the magnetic properties of DMP magnets are B,=1.308 T,Hcj=799.980 kA/m and(BH)max=325.6436 kJ/m3,which are higher than those for SMP magnets(B,=1.297 T,Hcj=746.8868 kA/m and(BH)max=317.8428 kJ/m3)with the same nominal composition,and the impro-ved RE-rich phase distribution and REs heterogeneity distribution are the main reasons.When DMP magnets are exposed to a hygro-thermal environment,there is not only RE-rich phase corrosion,but also pulverized main phase grain due to hydrogenation behavior difference between LaCe-rich and LaCe-lean shell-core within one individual grain.As a result,it is demonstrated that DMP techni-que is an effective approach to improve the permanent magnetic properties and corrosion resistance of MM-based sintered magnets.
关键词
混合稀土/双主相工艺/磁性能/抗腐蚀性/稀土的非均匀分布Key words
misch metal/double main phase process/magnetic properties/corrosion resistance/heterogeneous distribution of rare earth引用本文复制引用
基金项目
国家重点研发计划(2022YFB3505800)
内蒙古自治区自然科学基金(2022LH MS05006)
出版年
2024
NETL
NSTL
万方数据