Abstract
The intergranular addition process using Y72Co28 eutectic alloy powders has been applied to (Pr, Nd)27Dy4Fe67.65Cu0.15Al0.2B1(wt.%) sintered magnets, resulting in an enhanced thermal stability. It was found that the coercivity of magnets at 100 °C increased while the addition of Y72Co28 is 1 wt.%, whereas the magnetic properties decreased slightly at room temperature due to lower magnetocrystalline anisotropy field ( $ {H}\!_{ {A}}$ ) of Y2Fe14B. The temperature coefficient of remanence ( $ \alpha $ ) and coercivity ( $ \beta $ ) for the magnets improved significantly. Microstructure observation indicated that Y atoms prefer to enter into the 2-14-1 phase and form a core-shell structure with an outer layer of (Nd, Dy, Y)2(Fe, Co)14B. Magnetic domain and intrinsic properties analysis suggested that the improved thermal stability resulted from the modified grain boundaries and the introduction of Y in matrix phases.
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