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Effect of sintering conditions on the magnetic and microstructural properties of Nd–Fe–B sintered magnets doped with DyF3 powders

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5 Author(s)
Park, Song-E ; Department of Materials Science and Engineering, Korea University, Seoul 136-713, Korea ; Kim, Tae-Hoon ; Lee, Seong-Rae ; Namkung, Seok
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The microstructural and magnetic property changes of DyF3-doped (Nd26.06, Dy6.51)–Febal –B0.97–M2.39 (wt. %) (M = Cu, Al, Co, and Nb) sintered magnets as functions of the sintering conditions were studied. The sintering conditions for the optimum core-shell microstructure were determined. When the magnets were sintered at 1050 °C for 4 h, a coercivity of 35.1 kOe was obtained without sacrificing the remanence. When the magnets were doped with DyF3, the formation of the RE-rich phase (Nd–Dy–O) was effectively suppressed and, hence, saving the Dy. In addition, the formation of a cubic-NdOF triple-junction phase (TJP) improves the interface uniformity and enhances the coercivity.

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Journal of Applied Physics  (Volume:111 ,  Issue: 7 )