【摘 要】
：
Fine ground powders of Nd-Fe-B sintered magnet bulks(particle size=46～125 μm in diameter) were coated and alloyed with Yb metal by sorbing them. A significant r
【机 构】
：
Collaborative Research Center for Advanced Science and Technology
论文部分内容阅读
Fine ground powders of Nd-Fe-B sintered magnet bulks(particle size=46～125 μm in diameter) were coated and alloyed with Yb metal by sorbing them. A significant recovery of the decreased magnetic properties of the ground powders(remanence Br=～0.95 T, coercivity Hcj =～227 kA·m-1 and maximum energy product(BH)max=～48.8 kJ·m-3) was observed in accordance with increasing temperature up to 800 ℃. The sorbing temperature and time for Yb metal vapor were optimized and after heating at 800 ℃ for 90 min and annealing subsequently at 610 ℃ for 60 min, the Br, Hcj and(BH)max values were increased to be 0.98 T, 712 kA·m-1 and 173 kJ·m-3, respectively. From the microstructural characterizations of resulting samples by using X-ray diffraction(XRD), scanning electron microscopy(SEM), and electron probe X-ray microanalyzer(EPMA), it is found that the sorbed Yb metal uniformly covers the surface and diffuses to the Nd-rich grain boundary of fine ground powders of Nd-Fe-B sintered magnet bulks forming a(Nd,Yb)Fe2 phase.
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