磁性的影响
(北京科技大学 新金属材料国家重点实验室, 北京100083)
摘 要: 用XRD、 TEM、 Mossbauer谱和VSM等实验方法, 研究了不同Pr含量、 B含量和Cu含量的Pr2Fe14B/α-Fe型纳米复合快淬带的显微结构与磁性。结果表明： PrxFe94-xB6合金在x=8（α-Fe体积分数约30%）时磁性能最佳, Br=1.29T, Hci=461.7kA/m, (BH)max=165.6kJ/m3； Pr8.5(Fe0.8Co0.2)86.5-xCuxB5合金在x=0.5时获得最佳的磁性能； 随B含量增加, 富B相在晶界分布,
关键字: 纳米复合永磁； 熔体快淬； 磁性能
（State Key Laboratory for Advanced Metals and Materials,
University of Science and Technology Beijing, Beijing 100083, China）
Abstract:Microstructure and magnetic properties of nanocomposite Pr2Fe14B/α-Fe ribbons with different Pr, B and Cu contents, prepared by melt-spinning or subsequent annealing were investigated by the methods of XRD, TEM, Mossbauer and VSM. As a result, the excellent magnetic properties with Br=1.29T, Hci461.7kA/m, (BH)max=165.6kJ/m3 are obtained in Prx, Fe94-xB6 ribbons with x=8. High performance is also achieved in Pr8.5(Fe0.8Co0.2)86.5-xCuxB5 ribbons with x=0.5. As the content of B in Pr8Fe92-xBx ribbons increases, the distribution of B-rich phases at intergranular regions results in the weakening of exchange coupling and the decreasing of magnetic properties.
Key words: nanocomposite permanent magnets； melt-spinning； magnetic properties
