Abstract
The high-temperature oxidation resistance is a critical evaluation index for the practical applications of Nd-Fe-B sintered magnets. In this paper, the high temperature (>523 K) oxidation behavior of the recycled Nd-Fe-B sintered magnets was investigated and compared with the original magnets. The results show that both magnets exhibit similar high-temperature oxidation characteristics. The recycled magnets oxidized after 300 h at 673 K possesses remanence (Br) of 1.189 T, coercivity (Hci) of 1688 kA/m, and maximum energy product [(BH)max] of 268 kJ/m3. Compared with the recycled magnet before oxidizing, the oxidized recycled magnets retain 96.0% of Br, 85.2% of Hci, and 92.2% of (BH)max, respectively. The recycled magnets negatively influence the high-temperature oxidation resistance compared with the original magnets, demonstrating the recycled magnets' applicability.
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