Abstract
The effects of furnace cooling, air cooling and quenching in liquid argon from 1100°C on the coercivity of Nd 16.4Fe 75.7B 7.9 (A), Nd 17Fe 78.5B 5Cu 1.5 (B) and Nd 17Fe 79B 4 (C) sintered magnets have been investigated. In magnet A, a considerable fall in H cl, occurred on quenching whilst air or furnace cooling caused successively less deterioration in H cl . The coercivity of quenched magnet A was partially restored during annealing at 600 or 680 °C. In magnet B, no significant fall in H cl was observed on cooling at different cooling rates, and a considerable improvement in H cl occurred on subsequent annealing at 600°C. Magnet C showed a remarkable increase in H cl on quenching whilst air cooling or furnace cooling resulted in successively smaller improvements in the H cl values. The coercivity of magnet C dropped drastically after quenching and then annealing at 600°C. In magnets A and B the coercivity behaviour on cooling was related mainly to the melting temperature and to the wettability characteristics of the intergranular phase(s) in these magnets, and to the formation of metastable phases on quenching, whereas in magnet C, redistribution and dissolution of soft magnetic phase(s) during the high temperature (1100°C) treatment could be responsible for the changes in H cl .
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