Preparation of Highly Textured Hydrogenation–Disproportionation–Desorption–Recombination Powders for Nd–Fe–B Sintered Magnets

Author

Yinfeng Zhang ; Tao Liu ; Jingzhi Han ; Lei Zhou ; Xiaodong Zhang ; Shunquan Liu ; Xiumei Ma ; Jinbo Yang ; Yingchang Yang

Author_Institution

Sch. of Phys., Peking Univ., Beijing, China

Volume

51

Issue

11

fYear

2015

Firstpage

1

Lastpage

4

Abstract

As-cast Nd-Fe-B strips without an annealing treatment were treated by an appropriate hydrogenation-disproportionation- desorption-recombination (HDDR) process, and highly textured HDDR strip powders with uniform Nd-rich grain boundary layers can be obtained. The HDDR powders with a particle size of 50 μm show a Br of 1.13 T and a i H_c of 10.5 kOe. The crystal texture in the HDDR powders may come from the memory for the own crystallographic orientation and the casting texture of Nd₂Fe₁₄B columnar grains in the as-cast strips. The highly textured HDDR powders with uniform Nd-rich grain boundary layers can be used to prepare the fine-grained sintered magnets by a conventional jet-milling technique and sintering process.

Keywords

boron alloys; casting; crystal orientation; desorption; grain boundaries; hydrogenation; iron alloys; milling; neodymium alloys; particle size; powders; sintering; strips; texture; Nd-Fe-B sintered magnets; NdFeB; cast Nd-Fe-B strips; casting texture; columnar grains; crystal texture; crystallographic orientation; fine-grained sintered magnets; highly textured hydrogenation-disproportionation-desorption-recombination powder preparation; jet-milling technique; particle size; sintering process; size 50 mum; strip powders; uniform Nd-rich grain boundary layers; Casting; Coercive force; Grain boundaries; Magnetic domains; Powders; Strips; X-ray diffraction; HDDR; Nd-Fe-B; sintered magnets;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2015.2439297

Filename

7115125