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The effect of V or W additives to microstructure and coercivity of Nd-Fe-B based magnets

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3 Author(s)
Bernardi, Johannes ; Inst. of Appl. & Tech. Phys., Tech. Univ. Vienna, Austria ; Fidler, J. ; Fodermayr, F.

Co-substituted Nd-Fe-B magnets show an increased Curie temperature. The coercivity of these magnets is reduced due to the formation of Co-rich phases. In addition to the hard magnetic phase the Nd-rich intergranular phase exists, which results in bad corrosion resistance. In (Nd,Dy)-(Fe,Co)-B:Al type magnets doped with V, (V1-xFex)3B2 intergranular phases and precipitates with Si2U3 structure and a Nd-rich Co-containing phase partly replacing the Nd-rich phase were found. X-ray microanalysis shows that in (Nd,Dy)-(Fe,Co)-B:(Al,V) magnets Dy is mainly dissolved in the hard magnetic phase. Comparison with W-doped Nd-Fe-B magnets shows that W also forms an intergranular WFeB phase with Co2Si-structure and precipitates within the hard magnetic phase with presumably the same composition

Published in:

Magnetics, IEEE Transactions on  (Volume:28 ,  Issue: 5 )

Date of Publication:

Sep 1992

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