Title :
Study on ultrafine-grained sintered Nd-Fe-B magnets produced from jet-milled HDDR powders
Author :
Ding, G. ; Guo, S. ; Cai, L. ; Chen, L. ; Liu, J. ; Lee, D. ; Yan, A.
Author_Institution :
Ningbo Ningbo Inst. of Mater. Technol. & Eng., Ningbo, China
Abstract :
In this study, ultrafine Nd-Fe-B powders were prepared by jet milling of HDDR processed strip casting (SC) alloys with nominal composition of Nd25.92Pr6.48Febal.B1Al0.2Cu0.2Nb0.2Ga0.12 (wt .%). After magnetic compaction, sintering was carried out at 940~970 followed by annealing at 500 for 2 h. The magnetic properties were measured by using SQUID magnetometer in fields of up to 4T. Microstructure observation was taken by field emission scanning electron microscope (SEM) and transmission electron microscopy (TEM).
Keywords :
aluminium alloys; annealing; boron alloys; compaction; copper alloys; crystal microstructure; desorption; field emission electron microscopy; gallium alloys; hydrogenation; iron alloys; magnetisation; milling; neodymium alloys; niobium alloys; permanent magnets; praseodymium alloys; scanning electron microscopy; sintering; transmission electron microscopy; Nd25.92Pr6.48Febal.BAl0.2Cu0.2Nb0.2Ga0.12; SQUID magnetometer; annealing; field emission scanning electron microscope; hydrogenation-disproportionation-desorption-recombination process; jet milling; magnetic compaction; magnetic properties; microstructure; sintering; time 2 h; transmission electron microscopy; ultrafine-grained sintered magnets; Coercive force; Magnetic domains; Magnetic resonance imaging; Magnetic tunneling; Magnetometers; Perpendicular magnetic anisotropy;
Conference_Titel :
Magnetics Conference (INTERMAG), 2015 IEEE
Conference_Location :
Beijing
Print_ISBN :
978-1-4799-7321-7
DOI :
10.1109/INTMAG.2015.7156587
