Nu Si A Eom
Korea Institute for Rare Metal, Republic of Korea
Title: Synthesis and chariterization of 1-dimensional NdFeB nano fiber using electrospinning process
Biography
Biography: Nu Si A Eom
Abstract
The development of permanent magnet materials has led to the demand for innovative technologies such as electric motors and generators for energy conversion devices. Especially, The hard magnet materials based on NdFeB have been applied to wide areas such as automobiles, electrical devices and magnetic disks due to their excellent magnetic properties. The NdFeB including the transition metals such as Fe has also magnetoâ€optical eff ects. NdFeB based magnetic materials were generally synthesized using the classical powder metallurgy process. However, it was difficult to align easy magnetization axis (c-axis) and to obtain homogeneous microstructure for enhancing magnetic performances. Th ere has also been little signifi cant research on one-dimensional Nd-Fe-B magnetic synthesizing c-axis alignment. In this study, one-dimension NdFeB materials having c-axis alignment were facilely prepared through electrospinning process. In order to confirm magnetic properties with wire diameter, synthesis conditions were controlled by PVP volume. Th ese Nd-Fe-B fi bers had the diameter within a range from 700 to 1300nm. Th ese metal oxides polycrystalline fi bers were subsequently heat treated in the high vacuum furnace in the presence of the calcium as a reducing agent, resulted in Nd2Fe14B fi bers. Th e morphology of the synthesized Nd-Fe-B material was 1300nm analyzed by fi eld emission scanning electron microscope (FE-SEM) and X-ray diff raction (XRD). Th e magnetic property as a function of Nd-Fe-B wire diameter was conducted using vibrating sample magnetometer (VSM). Th e coercivity (Hci) of Nd2Fe14B fi bers was about 4800Oe. Th e values of saturation magnetization (Ms) and remanence (Mr) of fibers were 45emu/g and 20 emu/g.