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A study of the effects of Cu-addition on the annealing behavior and microstructures of Nd-Fe-B type sintered magnets

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2 Author(s)
Ragg, O.M. ; Sch. of Metall. & Mater. Sci., Birmingham Univ., UK ; Harris, I.R.

A high temperature homogenization treatment (1100°C for one hour) is applied to sintered magnets of Nd17Fe76.5B5Cu1.5. This is followed by a low temperature anneal (600°C for one hour). The magnetic properties of the samples are related to their microstructure. The formation of Nd2Fe17 during the homogenization and quench treatment is thought to be responsible for the fall in coercivity, and the increased remanence is attributed to an increased fraction of the Nd2Fe14B matrix phase. The subsequent anneal at 600°C causes the disappearance of most of the Nd2Fe17 phase and this corresponds with an increase in the coercivity. Quenching after the 600°C anneal gives better magnetic properties than slow cooling from this temperature. Furnace cooling the sample after homogenization results in the disappearance of the Nd2Fe17 phase and this treatment gives the highest coercivity and energy product

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Magnetics, IEEE Transactions on  (Volume:29 ,  Issue: 6 )