Novel design of self-compensated thermally stable Ce magnets without critical elements

Feng Xia; Qisong Sun; Minggang Zhu; Yu Wang; Yikun Fang; Wei Li

Materials & Design (Apr 2022)

Novel design of self-compensated thermally stable Ce magnets without critical elements

Feng Xia,
Qisong Sun,
Minggang Zhu,
Yu Wang,
Yikun Fang,
Wei Li

Affiliations

Feng Xia: Division of Functional Materials, Central Iron & Steel Research Institute, Beijing 100081, China; Baotou Jinshan Magnetic Material Co., Ltd., Baotou 014030, China
Qisong Sun: Division of Functional Materials, Central Iron & Steel Research Institute, Beijing 100081, China; School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
Minggang Zhu: Division of Functional Materials, Central Iron & Steel Research Institute, Beijing 100081, China; School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China; Corresponding author at: Division of Functional Materials, Central Iron & Steel Research Institute, Beijing 100081, China.
Yu Wang: Division of Functional Materials, Central Iron & Steel Research Institute, Beijing 100081, China
Yikun Fang: Division of Functional Materials, Central Iron & Steel Research Institute, Beijing 100081, China
Wei Li: Division of Functional Materials, Central Iron & Steel Research Institute, Beijing 100081, China

Journal volume & issue: Vol. 216
p. 110590

Abstract

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A novel design concept was proposed for optimizing the grain boundaries from the theoretical aspect, which could play the self-compensation effect on the thermal stability of the coercivity. The Pr-Nd-Al Ce magnet without critical elements was investigated that experimentally verified the self-compensation effect of grain boundaries structure on the thermal stability of the coercivity. As a result, the Pr-Nd-Al Ce magnet with 3 wt% (Pr0.25Nd0.75)80Al20 as the additive inside the grain boundaries had better thermal stability than that of Nd-Fe-B magnet. The coercivity temperature coefficient β of Pr-Nd-Al Ce magnet was improved by 5.7%, and the irreversible loss of magnetic flux hirr was enhanced by 58% at the temperature of 100 ℃ compared with the Nd-Fe-B magnet. The improvement of thermal stability was attributed to the special sandwich-like structure consisting of two amorphous nonmagnetic phases sandwiching a layer of Re6(Fe, TM)11Al3 tetragonal phase, that compensated the coercivity of Ce magnets without critical elements.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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