Effect of Ce on the Magnetic Properties and Microstructure of Sintered Didymium-Fe-B Magnets

Author

Changjiang Yan ; Shuai Guo ; Renjie Chen ; Dong Lee ; Aru Yan

Author_Institution

Key Lab. of Magn. Mater. & Devices, Ningbo Inst. of Mater. Technol. & Eng., Ningbo, China

Volume

50

Issue

10

fYear

2014

fDate

Oct. 2014

Firstpage

1

Lastpage

5

Abstract

In this paper, the influence of the substitution of didymium (Pr-Nd alloy, abbreviated to Di) with Ce on the microstructure and magnetic properties of sintered permanent magnet was investigated. A series of (Di_1-x Ce_x)_27.5Dy₃Al_0.1Cu_0.1Fe_bal.B₁ (x = 0-0.56) magnets were fabricated by powder metallurgy route. The results indicated that essential magnetic properties, such as remanence and energy product, deteriorated by substituting Di with Ce. In general, the coercivity decreased with the increase of the content of Ce, whereas there was a sudden increase of coercivity when x = 0.24. Microstructural observations and phase analyses illustrated that grain boundary layers were thickened in magnets with x ≥ 0.24, which was attributed to the formation of CeFe₂ phase.

Keywords

aluminium alloys; boron alloys; cerium alloys; coercive force; copper alloys; dysprosium alloys; grain boundaries; iron alloys; neodymium alloys; permanent magnets; powder metallurgy; praseodymium alloys; remanence; sintering; [(PrNd)_1-xCe_x]_27.5Dy₃Al_0.1Cu_0.1FeB; coercivity; didymium substitution; energy product; grain boundary; magnetic properties; microstructure; phase analyses; powder metallurgy; remanence; sintered permanent magnet; Coercive force; Grain boundaries; Magnetic resonance imaging; Magnetic tunneling; Perpendicular magnetic anisotropy; Saturation magnetization; Didymium-Fe-B; magnetic properties; microstructure; powder metallurgy;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2014.2322823

Filename

6813676