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Reduction diffusion process for preparation of Nd-Fe-B based alloy
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 α-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).
Reduction diffusion process for preparation of Nd-Fe-B based alloy
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 α-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).
Reduction diffusion process for preparation of Nd-Fe-B based alloy
Chang Woo Kim, (author) / Young Hwan Kim, (author) / Hyun Gil Cha, (author) / Young Soo Kang, (author)
2006-10-01
870330 byte
Conference paper
Electronic Resource
English
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