ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The synthesis of Nd-Fe-Co-B by the reduction-diffusion process from neodymium trichloride and its magnetic properties and microstructure have been investigated by x-ray diffraction, scanning electron microscope, and magnetic analysis. According to the thermodynamic data, calcium is capable of reducing neodymium trichloride and then a Nd-Fe-Co-B alloy is formed by thermal diffusion in the presence of iron, cobalt, and ferro-boron powders at high temperature. The reduction reaction starts at 720 °C. Thermal diffusion commenced at 800 °C and forming some Nd2Fe14B phase, but the matrix Nd2Fe14B formed primarily at 860–950 °C. There are three types of phases with different compositions in the sintered Nd-Fe-Co-B R/D powders. The oxygen and calcium contents were 0.2 and 0.1 wt. %, respectively. The best yield of Nd-Fe-Co-B powder was up to 98%. The magnetic properties of the sintered Nd-Fe-Co-B depended on the temperature and time of the reduction-diffusion process. The best magnetic properties obtained were Br =12.6 kGs, Hc =8 kOe, and (BH)m =36.4 MGOe.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.342322
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