摘要
利用差热(扫描)分析、X射线、透射电镜、振动作品磁强计研究了添加Co、Dy对Fe_3B/Nd_2Fe_(14)B纳米复合永磁材料的微结构和性能的影响。结果表明:添加适当的微量元素可以提高Nd_(4.5)Fe_(77)B_(18.5)纳米复合永磁材料的内禀磁性,改进微结构,从而提高材料的永磁性能。在Nd_(4.5)Fe_(77)B_(18.5)中添加1％～3％(原子分数)的Co、Dy明显地降低材料的晶化温度和最佳热处理温度、提高了2:14:1相的居里温度、改善了纳米复合永磁材料的微观结构,从而提高材料的永磁性能与Nd_(4.5)Fe_(77)B_(18.5)相比,Nd_(3.5)Fe_(74)Co_3Dy_1B_(18.5)的永磁性能为:Br=1.06T,_jH_c=328kA/m,(BH)_(max)=108.9kJ/m^3,分别提高了26％,17％和104％。
The influences of the addition of trace elements Co, Dy in nanocomposite Fe3B/Nd2Fe14B permanent magnetic material on the crystallization temperature, Curie temperature, optimum annealing process, microstructure and hard magnetic properties were studied by using the differential scanning calorimetry (DSC), X-ray diffraction (XRD), transmission electron microscopy (TEM) and vibration sample magnetometer (VSM). The experimental results show that it is difficult to get the nanocomposite material with high hard magnetic properties for Nd4.5Fe77B18.5 and the 1%-3% addition of Co, Dy in such alloy obviously decreases the crystallization temperature and the optimum annealing temperature, increases the Curie temperature of 2:14:1 phase, improves the microstructure and enhances the hard magnetic properties.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2003年第4期396-400,共5页
Chinese Journal of Materials Research
基金
国家863项目2002AA32450
国家自然科学基金59971026
山东省自然科学基金Y2000F10
