Abstract
Sintered [Nd0.45(LarDy1)1/(r+1)*0.55]2.6Fe14B magnets (r = 1 to 3) were studied. Magnetic properties and microstructures of the magnets were investigated by magnetic measurements and electron microprobe analysis. The microstructure of magnets consists of a mixed rare-earth (MRE)2Fe14B (2: 14: 1) phase matrix having a grain size of ∼8 μm and a rare earth (RE)-rich grain boundary phase. The grain boundaries are rich in La and Nd but depleted in Dy, while the La, Nd, and Dy contents are constant across the 2: 14: 1 grains. The coercivity and temperature stability of magnets are improved with increasing Dy content. A (BH)max of 21.1 MGOe at room temperature is obtained in the magnet with r = 1. Temperature coefficients of α = −0.06 and β = −0.48% °C were also obtained, which is comparable to those of Nd-based magnets with the best temperature stability. Unfortunately, the improvement of coercivity and its temperature coefficient is mainly achieved by adding greater amounts of Dy and DyF3, which leads to low (BH)max values and high magnet costs.
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