稀土钆对钐钴基永磁体温度稳定性的定点调控
Fixed-point control of temperature stability of samarium cobalt based permanent magnets by rare earth gadolinium
刘涛 1王超 1毕以飞 1方以坤1
作者信息
- 1. 钢铁研究总院有限公司功能材料研究院,北京 100081
- 折叠
摘要
探讨了稀土钆对钐钴(Sm-Co)基永磁体温度稳定性的定点调控.通过调整Gd含量,系统研究了其对分子式为Sm1-xGdx(CobalFe0.1Cu0.08Zr0.026)7.2(x=0.44～0.50)磁体磁温度稳定性的作用.实验结果表明,随着Gd含量的增加,剩磁Br和最大磁能积(BH)m降低,而剩磁温度系数α的绝对值减小,表明在293～373 K区间,高Gd含量磁体对温度变化的敏感性降低.此外,磁体磁矩最大值所对应的温度逐渐提高,表明高Gd含量磁体在高温区表现出更稳定的磁性能.微观结构分析揭示了 Gd含量增加导致晶粒尺寸减小和胞内相尺寸增加,以及Cu元素在胞壁处的富集.研究结果为Sm-Co基永磁体温度稳定性的定点调控提供了科学依据.
Abstract
The fixed-point control of rare earth gadolinium on the temperature stability of samarium cobalt(Sm-Co)based permanent magnets was explored.By adjusting the Gd content,the effect of Gd on the magnetic temperature stability of Sm1-xGdx(CobalFe0.1Cu0.08Zr0.026)7.2(x=0.44-0.50)magnet was systematically studied.Experimental re-sults show that with the increase of Gd content,the remanence Br and the maximum energy product(BH)m de-crease,while the absolute value of the remanence temperature coefficient a decreases,indicating that magnets with high Gd content exhibit reduced sensitivity to temperature changes in the range of 293-373 K.Moreover,the tem-perature corresponding to the maximum magnetic moment increases,demonstrating that magnets with high Gd con-tent display more stable magnetic properties in high-temperature regions.Microstructural analysis reveals that in-creased Gd content leads to a reduction in grain size and an increase in cell phase size,as well as enrichment of Cu at the cell boundaries.The research results provide a scientific basis for the fixed-point regulation of temperature sta-bility of Sm-Co based permanent magnets.
关键词
Sm-Co磁体/稀土Gd/磁性能/剩磁温度系数/微观结构Key words
Sm-Co magnet/rare earth gadolinium/magnetic properties/remanence temperature coefficient/micro-structure引用本文复制引用
出版年
2024
NETL
NSTL
万方数据