Abstract

The influence of partial C substitution for B on structural and magnetic properties of Nd 17Fe 76(B 1 − x C x ) 7 alloys has been studied. It has been discovered that the stable hard magnetic phase Nd 2Fe 14(B,C) with the tetragonal structure can be formed if x < 0.9. As the C content increases, the lattice constant a is nearly constant whereas c decreases linearly. Furthermore, with increasing C content, the microstructure of cast alloys and sintered magnets varies. The temperature dependence of the anisotropy field H A and the coercivity i H c of the Nd 17Fe 76 (B 1 − x C x ) 7 alloys was measured from room temperature up to about 300 °C. The anisotropy field H A increases whereas the coercivity i H c decreases greatly with increasing C content.

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