Title :
Reduction diffusion process for preparation of Nd-Fe-B based alloy
Author :
Kim, Chang Woo ; Kim, Young Hwan ; Cha, Hyun Gil ; Kang, Young Soo
Author_Institution :
Pukyong Nat. Univ., Pusan
Abstract :
Starting from the ultra fine Nd-Fe-B nanoparticle synthesized by chemical reduction, Nd-Fe-B based alloy was successfully prepared by reduction-diffusion process. The amorphous Nd-Fe-B based nanoparticle was synthesized from reduction of FeCl2 and NdCl3 with NaBH4 as a reducing agent in aqueous solution. Precipitates composed of Fe-B based, Fe2O3, and Nd2O3 was used as starting materials. After the synthesized Fe2O3 phase was changed to alpha-Fe phase with high-purity mixed gas, Nd2O3 phase was reduced by calcium hydride. The obtained Nd-Fe-B based materials are fine crystalline powder, and the particle size of these materials can be controlled to about a few-micro. The magnetic properties of the Nd-Fe-B based alloy were characterized by vibrating sample magnetometer (VSM) and X-ray powder diffraction (XRD). The size of nanoparticles was investigated by transmission electron microscopy (TEM), scanning electron microscopy (SEM) and field emission scanning electron microscopy (FE-SEM). Chemical compositions were examined using energy dispersive X-ray spectroscopy (EDX).
Keywords :
X-ray chemical analysis; X-ray diffraction; amorphous magnetic materials; boron alloys; diffusion; iron alloys; magnetometers; nanoparticles; neodymium alloys; particle size; powders; reduction (chemical); sodium alloys; transmission electron microscopy; EDX; FE-SEM; Fe2O3; Fe2O3 - Binary; FeCl2; FeCl2 - Binary; NaBH4; NaBH4 - System; Nd-Fe-B based alloy; Nd2O3; Nd2O3 - Binary; NdCl3; NdCl3 - Binary; TEM; VSM; X-ray powder diffraction; XRD; amorphous Nd-Fe-B nanoparticle; aqueous solution; calcium hydride; chemical compositions; chemical reduction; crystalline powder; energy dispersive X-ray spectroscopy; field emission scanning electron microscopy; magnetic properties; nanoparticle size; reduction diffusion process; transmission electron microscopy; ultrafine Nd-Fe-B nanoparticle; vibrating sample magnetometer; Crystalline materials; Diffusion processes; Electron emission; Iron; Magnetic materials; Neodymium; Phase change materials; Powders; Scanning electron microscopy; Transmission electron microscopy; Nd-Fe-B based alloy; coprecipitation; reduction-diffusion;
Conference_Titel :
Nanotechnology Materials and Devices Conference, 2006. NMDC 2006. IEEE
Conference_Location :
Gyeongju
Print_ISBN :
978-1-4244-0541-1
Electronic_ISBN :
978-1-4244-0541-1
DOI :
10.1109/NMDC.2006.4388949
