Abstract
Single-phase Nd 2Fe 14B offers the possibility of improving the corrosion behaviour and the magnetic properties of sintered NdFeB magnets in combination with an appropriate sintering additive by forming a two-phase magnet. Furthermore, the single-phase Nd 2Fe 14B is suitable for the manufacturing of resin-bonded magnets produced by, for instance, the hydrogenation, disproportionation, desorption and recombination process. In view of this background the coreduction process has been improved for the production of single-phase Nd 2Fe 14B. Single-phase Nd 2Fe 14B is obtained by choosing appropriate raw materials and performing the co-reduction process in a controlled way. X-ray diffraction analysis showed the hard magnetic phase Nd 2Fe 14B and only traces of NdFe 4B 4, but no α-Fe and Nd-rich phase. Some α-Fe precipitates were identified by metallographic examination and scanning electron microscopy with energy-dispersive X-ray analysis.
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