Abstract
Abstract The effects of Co, Zr, Nb, Ga and Dy additions upon the magnetic properties of PrFeB-based alloys have been studied. Bonded magnets have been prepared from as-cast and homogenised alloys using an optimised hydrogenation disproportionation desorption and recombination (HDDR) process. In general, the HDDR bonded magnets from homogenised alloys exhibited higher remanence (Br), squareness factor (SF) and intrinsic coercivity (iHc). In particular, the Pr13.7Fe63.5Co16.7B6Nb0.1 HDDR magnet exhibited the best overall magnetic properties (Br=1032±20 mT, iHc=793±20 kA/m and SF=0.51), indicating that Co and Nb additions, in these proportions have a beneficial effect on PrFeB-based magnets. Conversely, additions of Ga and Dy were observed to dramatically reduce the intrinsic coercivity of Pr-based HDDR magnets.
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