Strategy of magnetic hardening region regulation enables a record enhanced energy product and high coercivity in Nd-Fe-B magnets

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2024-10-19 DOI:10.1007/s12598-024-03011-1

Zhi Jia, Yu-Hao Li, Xin-Tong Yang, Shuai Cao, Guang-Fei Ding, Shuai Guo, Xiao-Dong Fan, Yu-Heng Xie, Zhi-Wei Xiong, Ren-Jie Chen, A-Ru Yan

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引用次数: 0

Abstract

By developing high comprehensive performance ((BH)_max + H_cj), Nd-Fe-B magnets can operate stably in high-temperature applications, greatly expanding the application scenarios of them. Unfortunately, there is a constraint relationship between coercivity (H_cj) and maximum magnetic energy product ((BH)_max), and an increase in H_cj always accompanies a decrease in (BH)_max. Here, the excellent comprehensive magnetic performance of up to 86.54, namely (BH)_max of 42.33 MGOe and H_cj of 44.21 kOe, is unprecedented in the sintered Nd-Fe-B magnets. This magnet is obtained by designing a unique grain structure through micrometallurgical reactions to prepare a matrix with excellent comprehensive performance, and then by stepwise diffusion, the (BH)_max and H_cj of the magnet are simultaneously enhanced. The magnet prepared in this way has a “double-shell core” structure and Tb segregation distribution inside the core. The working temperature of the magnet in this work reached 280 °C, providing a new approach for the development of high-performance Nd-Fe-B magnets.

Graphical abstract

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.