Abstract
The effect of variable cobalt concentration and variable annealing times on the hard magnetic properties of Nd-Fe-C-type ingot magnets was studied. It was found that cobalt substitution can lead to a significant decrease in the annealing time needed to harden the ingots magnetically. A simple production route is described in which an isotropic ingot magnet is obtained after annealing for several hours with ( BH) max =70 kJ m −3, B r =0.63 T and J H c = 900 kA m −1.
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