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 stabilityof samarium cobalt based permanent magnets by rare earth gadolinium

作　　者：刘涛[1] 王超[1] 毕以飞 方以坤[1] LIU Tao;WANG Chao;BI Yifei;FANG Yikun(Division of Function Materials,Center Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]钢铁研究总院有限公司功能材料研究院,北京100081

出　　处：《金属功能材料》2024年第6期110-116,共7页Metallic Functional Materials

基　　金：钢铁研究总院青年基金项目“钐钴基合金高温显微组织动态演变特性及温度系数调整技术”(事23020270B)。

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Sm_(1-x)Gd_(x)(Co_(bal)Fe_(0.1)Cu_(0.08)Zr_(0.026))_(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293~373K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。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 Sm_(1-x)Gd_(x)(Co_(bal)Fe_(0.1)Cu_(0.08)Zr_(0.026))_(7.2)(x=0.44~0.50)magnet was systematically studied.Experimental results show that with the increase of Gd content,the remanence Brand the maximum energy product(BH)mdecrease,while the absolute value of the remanence temperature coefficientɑdecreases,indicating that magnets with high Gd content exhibit reduced sensitivity to temperature changes in the range of 293-373K.Moreover,the temperature corresponding to the maximum magnetic moment increases,demonstrating that magnets with high Gd content display more stable magnetic properties in high-temperature regions.Microstructural analysis reveals that increased 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 stability 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 

分 类 号：TM2[一般工业技术—材料科学与工程]