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Coercive force of Co added Nd-Fe-B based powders prepared by crushing sintered magnets

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4 Author(s)
Sakai, I. ; Toshiba Corp., Kawasaki, Japan ; Tsutai, A. ; Sahashi, M. ; Inomata, K.

An anisotropic resin-bonded magnet was prepared by crushing sintered Nd-Fe-B magnets with Co-Al or Co-Ga. The following magnetic properties for the composition of Nd14.5Fe63Co16Ga1B5.5 were obtained: (BH)max=114 kJ/m3, Br=0.89 T, and iHc=810 kA/m. Co addition is shown to play a significant role in improving the magnetic properties of the crushed powder. The surface layer damaged by crushing becomes thinner in the powder containing Co. In the Co-added sintered magnets, the main crack brought about by Vickers indentation is comparatively easy to propagate through the grain boundaries, and microcrack branchings are rarely observed. These mechanical properties are closely related to the thickness of the damaged surface layer. Al or Ga addition to the Nd-Fe-Co-B system is very effective for obtaining a high coercive force of the powder

Published in:

Magnetics, IEEE Transactions on  (Volume:26 ,  Issue: 5 )

Date of Publication:

Sep 1990

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