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用熔体快淬 +晶化处理的方法制备了不同Dy含量的Nd8-xDyxFe83 5Co2 Nb1Ga1B4 5(x =0 ,0 2 ,0 5 ,0 8,1 0 )纳米复合材料 ,用差动 (扫描 )分析 (DSC)、X 射线衍射 (XRD)、透射电镜 (TEM )等研究了样品的晶化过程及微结构 ,用振动样品磁强计 (VSM)测量了磁性能。实验结果表明 :硬磁性相的晶化温度随Dy含量的增加逐渐升高 ,在最佳热处理条件下 ,矫顽力随Dy含量的增加首先有较大的提高 ,在Dy含量x >0 8以后增加较缓慢。剩磁随Dy含量的增加逐渐下降 ,在Dy含量x >0 8以后下降更加显著 ,磁能积在x =0 5～ 0 8附近出现峰值。剩磁和矫顽力与Dy含量的非线性关系是由于软、硬磁性晶粒之间交换耦合作用的强弱导致的。
Nd8-xDyxFe83 5Co2 Nb1Ga1B4 5 (x = 0,02,05,08,1 0) nanocomposites with different Dy contents were prepared by melt quenching and crystallization. (DSC), X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used to study the crystallization process and microstructure of the samples. The magnetic properties were measured by vibrating sample magnetometer (VSM). The experimental results show that the crystallization temperature of the hard magnetic phase increases with the increase of the Dy content. Under the optimum heat treatment conditions, the coercive force first increases greatly with the increase of the Dy content. After the Dy content x> 0 8 Slower increase. The remanence decreases with the increase of Dy content, and decreases more obviously after Dy content x> 0 8. The peak of magnetic energy product appears near x = 0 5 ~ 0 8. The nonlinear relationship between remanence and coercivity and Dy content is due to the strength of exchange coupling between soft and hard magnetic grains.