Abstract
The magnetic properties of sintered Nd-(Dy)-Fe-B magnets prepared with different annealing conditions have been investigated. Thermomagnetic analysis was carried out on the sintered and annealed Nd-(Dy)-Fe-B magnets in the temperature range of room temperature to 320 °C. The coercivity of gas-quenched Nd14.1Fe78.3B7.6 magnets after annealing for 1 h at temperatures between 600 and 900 °C is higher by 3 kOe than the furnace-cooled one after annealing. Thermomagnetic analysis found that the sintered Nd14.1Fe78.3B7.6 magnet consists of the Nd2Fe14B phase as well as an unknown magnetic phase (A1) with Tc around 150 °C. The annealed magnets consist of two unknown magnetic phases (A1,A2) and the Nd2Fe14B phase with a Tc of 150, 240, and 305 °C, respectively. Thermomagnetic analysis also showed that the Mr value of the A2 phase in the gas-quenched Nd-Fe-B magnet was higher than that of the furnace-cooled one. These results seem to indicate that increase of coercivity is related to the formation of the A2 phase.
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