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

fYear

2015

fDate

11-15 May 2015

Firstpage

1

Lastpage

1

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 Nd_25.92Pr_6.48Fe_bal.B₁Al_0.2Cu_0.2Nb_0.2Ga_0.12 (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; Nd_25.92Pr_6.48Fe_bal.BAl_0.2Cu_0.2Nb_0.2Ga_0.12; 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;

fLanguage

English

Publisher

ieee

Conference_Titel

Magnetics Conference (INTERMAG), 2015 IEEE

Conference_Location

Beijing

Print_ISBN

978-1-4799-7321-7

Type

conf

DOI

10.1109/INTMAG.2015.7156587

Filename

7156587