论文部分内容阅读
利用表面活性剂辅助高能球磨(SA-HEBM)分别制备了高性能的各向异性Sm2Co17纳米永磁粉末材料,然后对球磨产物进行超声波分散清洗。利用高速离心技术进行纳米颗粒分级,获得颗粒尺寸分布狭窄的纳米永磁颗粒,对所得粉末进行适当的快速热处理。分别采用扫描电镜、X射线衍射和振动样品磁强计分析、测试样品的显微形貌、相结构和室温磁性能。结果表明,粉末的厚度在80 nm左右,长度为亚微米级,具有高比表面积、强形状各向异性与磁各向异性;经过磁场取向后,Sm2Co17的易磁化轴和难磁化轴方向的室温矫顽力分别达到612.9 k A/m(7.7 k Oe)和278.6 k A/m(3.5 k Oe);表面活性剂在球磨过程中起到了重要作用。
High-performance anisotropic Sm2Co17 nano-permanent magnetic powder materials were prepared by SA-HEBM, and then the ball milled products were dispersed by ultrasonic wave. Using high-speed centrifugation to classify the nanoparticles, the nano-particles with narrow particle size distribution are obtained, and the resulting powder is subjected to appropriate rapid heat treatment. The microstructure, phase structure and room temperature magnetic properties of the samples were tested by scanning electron microscopy, X-ray diffraction and vibrating sample magnetometer respectively. The results show that the thickness of the powder is about 80 nm and the length is sub-micron, which has high specific surface area, strong shape anisotropy and magnetic anisotropy. After the magnetic field orientation, the easy magnetization axis of Sm2Co17 and the hard axis of magnetization Coercivity reached 612.9 kA / m (7.7 kOe) and 278.6 kA / m (3.5 kOe), respectively. Surfactants played an important role in ball milling.