Magnetic properties, corrosion resistance, and microstructure of Nd–Fe–B sintered magnets with Tb6Fe13Cu addition

Jia Li; Shihui Li; Qingrong Yao; Weichao Huang; Jianqiu Deng; Jiang Wang; Guanghui Rao; Huaiying Zhou

Journal of Materials Research and Technology (Nov 2021)

Magnetic properties, corrosion resistance, and microstructure of Nd–Fe–B sintered magnets with Tb6Fe13Cu addition

Jia Li,
Shihui Li,
Qingrong Yao,
Weichao Huang,
Jianqiu Deng,
Jiang Wang,
Guanghui Rao,
Huaiying Zhou

Affiliations

Jia Li: School of Materials Science and Engineering, Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin, 541004, China
Shihui Li: School of Materials Science and Engineering, Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin, 541004, China
Qingrong Yao: School of Materials Science and Engineering, Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin, 541004, China; Corresponding author.
Weichao Huang: China Rare Metals and Rare Earth Jinyuan New Materials Co., Ltd., Hezhou, 542603, China
Jianqiu Deng: School of Materials Science and Engineering, Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin, 541004, China
Jiang Wang: School of Materials Science and Engineering, Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin, 541004, China
Guanghui Rao: School of Materials Science and Engineering, Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin, 541004, China
Huaiying Zhou: School of Materials Science and Engineering, Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin, 541004, China

Journal volume & issue: Vol. 15
pp. 4102 – 4108

Abstract

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We investigated the magnetic properties, corrosion resistance, and microstructure of Tb6Fe13Cu-added Nd–Fe–B sintered magnets through the magnetic measurement device, electrochemical method, and microstructure analysis. The results show that doping Tb6Fe13Cu can not only effectively improve the intrinsic coercivity but also significantly improve the corrosion resistance of the magnet. An intrinsic coercivity from 15.01 to 21.40 kOe is achieved in magnet by increasing the additive amounts of Tb6Fe13Cu to 3 wt%, while the remanence and the maximum energy product decreased slightly. It was also found that as the amount of addition increases, the corrosion potential of the magnet gradually becomes positive. Further investigations reveal that the remarkable enhancement in coercivity and corrosion resistance was owing to the formation of a Tb-rich (Nd, Pr, Tb)2Fe14B shell structure, the optimization in distribution/morphology of intergranular phases, and the more stable RE-rich phase.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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