Optimizing microstructure, magnetic properties and mechanical properties of sintered NdFeB magnet by double alloy method and grain boundary diffusion

Zhou Toujun; Weizong Bao; Zihan Xu; Mian Zhao; Xiangyun Huang; Weiguo Wei; Renhui Liu; Guoqiang Xie

doi:10.1016/j.intermet.2023.108027

Optimizing microstructure, magnetic properties and mechanical properties of sintered NdFeB magnet by double alloy method and grain boundary diffusion

Zhou Toujun
, Weizong Bao
, Zihan Xu
, Mian Zhao
, Xiangyun Huang
, Weiguo Wei
, Renhui Liu
, Guoqiang Xie^*

^*Corresponding author for this work

Harbin Institute of Technology (Shenzhen)
Ganjiang Innovation Academy
Jiangxi University of Science and Technology

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

This paper presents improvements in the coercivity, mechanical strength, and corrosion resistance of NdFeB magnets by modifying their microstructure using the double alloy method and grain boundary diffusion. The coercivity of magnet increases significantly from 16.66 kOe to 23.78 kOe with 0.64 wt% Tb usage. The overall magnetic performance (OMP) (BH)_max (MGOe) + H_cj (kOe) of diffusion magnet improves approximately 7.09%. Furthermore, the mechanical properties and corrosion resistance are enhanced through the diffusion process. The microstructure forms thin intergranular phases of RE-Fe-O and a double core-shell structure consisting of Dy and Tb. These modifications contributed to the improved properties of NdFeB magnets. The formation mechanism of double core-shell is analyzed in detail. This work proposes a viable method for preparing high comprehensive performance magnet with a low Dy/Tb content.

Original language	English
Article number	108027
Journal	Intermetallics
Volume	162
DOIs	https://doi.org/10.1016/j.intermet.2023.108027
State	Published - Nov 2023
Externally published	Yes

Keywords

Coercivity
Core-shell structures
Corrosion properties
Mechanical properties
NdFeB magnet

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10.1016/j.intermet.2023.108027

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@article{388e78cfc4b34b648a6c6c360ad322f2,

title = "Optimizing microstructure, magnetic properties and mechanical properties of sintered NdFeB magnet by double alloy method and grain boundary diffusion",

abstract = "This paper presents improvements in the coercivity, mechanical strength, and corrosion resistance of NdFeB magnets by modifying their microstructure using the double alloy method and grain boundary diffusion. The coercivity of magnet increases significantly from 16.66 kOe to 23.78 kOe with 0.64 wt\% Tb usage. The overall magnetic performance (OMP) (BH)max (MGOe) + Hcj (kOe) of diffusion magnet improves approximately 7.09\%. Furthermore, the mechanical properties and corrosion resistance are enhanced through the diffusion process. The microstructure forms thin intergranular phases of RE-Fe-O and a double core-shell structure consisting of Dy and Tb. These modifications contributed to the improved properties of NdFeB magnets. The formation mechanism of double core-shell is analyzed in detail. This work proposes a viable method for preparing high comprehensive performance magnet with a low Dy/Tb content.",

keywords = "Coercivity, Core-shell structures, Corrosion properties, Mechanical properties, NdFeB magnet",

author = "Zhou Toujun and Weizong Bao and Zihan Xu and Mian Zhao and Xiangyun Huang and Weiguo Wei and Renhui Liu and Guoqiang Xie",

note = "Publisher Copyright: {\textcopyright} 2023 Elsevier Ltd",

year = "2023",

month = nov,

doi = "10.1016/j.intermet.2023.108027",

language = "英语",

volume = "162",

journal = "Intermetallics",

issn = "0966-9795",

publisher = "Elsevier Ltd",

}

TY - JOUR

T1 - Optimizing microstructure, magnetic properties and mechanical properties of sintered NdFeB magnet by double alloy method and grain boundary diffusion

AU - Toujun, Zhou

AU - Bao, Weizong

AU - Xu, Zihan

AU - Zhao, Mian

AU - Huang, Xiangyun

AU - Wei, Weiguo

AU - Liu, Renhui

AU - Xie, Guoqiang

PY - 2023/11

Y1 - 2023/11

N2 - This paper presents improvements in the coercivity, mechanical strength, and corrosion resistance of NdFeB magnets by modifying their microstructure using the double alloy method and grain boundary diffusion. The coercivity of magnet increases significantly from 16.66 kOe to 23.78 kOe with 0.64 wt% Tb usage. The overall magnetic performance (OMP) (BH)max (MGOe) + Hcj (kOe) of diffusion magnet improves approximately 7.09%. Furthermore, the mechanical properties and corrosion resistance are enhanced through the diffusion process. The microstructure forms thin intergranular phases of RE-Fe-O and a double core-shell structure consisting of Dy and Tb. These modifications contributed to the improved properties of NdFeB magnets. The formation mechanism of double core-shell is analyzed in detail. This work proposes a viable method for preparing high comprehensive performance magnet with a low Dy/Tb content.

AB - This paper presents improvements in the coercivity, mechanical strength, and corrosion resistance of NdFeB magnets by modifying their microstructure using the double alloy method and grain boundary diffusion. The coercivity of magnet increases significantly from 16.66 kOe to 23.78 kOe with 0.64 wt% Tb usage. The overall magnetic performance (OMP) (BH)max (MGOe) + Hcj (kOe) of diffusion magnet improves approximately 7.09%. Furthermore, the mechanical properties and corrosion resistance are enhanced through the diffusion process. The microstructure forms thin intergranular phases of RE-Fe-O and a double core-shell structure consisting of Dy and Tb. These modifications contributed to the improved properties of NdFeB magnets. The formation mechanism of double core-shell is analyzed in detail. This work proposes a viable method for preparing high comprehensive performance magnet with a low Dy/Tb content.

KW - Coercivity

KW - Core-shell structures

KW - Corrosion properties

KW - Mechanical properties

KW - NdFeB magnet

UR - https://www.scopus.com/pages/publications/85167802554

U2 - 10.1016/j.intermet.2023.108027

DO - 10.1016/j.intermet.2023.108027

M3 - 文章

AN - SCOPUS:85167802554

SN - 0966-9795

VL - 162

JO - Intermetallics

JF - Intermetallics

M1 - 108027

ER -

Optimizing microstructure, magnetic properties and mechanical properties of sintered NdFeB magnet by double alloy method and grain boundary diffusion

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Keywords

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