Study on phase composition and grain boundary structure of sintered Nd-Fe-Co-B magnet

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-04-29 DOI:10.1016/j.matchar.2025.115103

Jiateng Zhang , Mingge Zhou , Dongli Li , Fanggui Wang , Hongsheng Chen , Yanqiu Xiong , Jiyuan Xu , Shengzhi Dong , Wei Li

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引用次数: 0

Abstract

In response to the progressively demanding operational conditions imposed on permanent magnet materials, the advancement of sintered Nd-Fe-Co-B permanent magnets exhibiting high temperature stability holds great importance. The magnetic properties and temperature stability of sintered Nd-Fe-Co-B magnets have been widely recognized. However, their internal structure is complex and has phases that reduce coercivity. There is still little research on their phase composition and microstructure. This study involved the fabrication of magnet powder with Co contents of 0.5 wt% and 16 wt%, which were subsequently employed in the production of magnets through the application of powder metallurgy techniques. Both the magnet powder and the magnets were characterized, and it was found that the RE(Fe,Co)₂ phase and RE₂(Fe,Co)₁₇ phase already existed in the magnet powder. The phenomenon of Co element migrating from grain boundaries to the 2–14-1 phase was discovered. In addition, crystalline Co-rich thin-layer grain boundary phases were also discovered in the magnets. Ultimately, this study provides a reference for understanding the phase transition and properties in sintered Nd-Fe-Co-B magnets.

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烧结Nd-Fe-Co-B磁体的相组成及晶界结构研究

为了应对日益苛刻的操作条件对永磁体材料的要求，具有高温稳定性的烧结Nd-Fe-Co-B永磁体的发展具有重要意义。Nd-Fe-Co-B烧结磁体的磁性能和温度稳定性得到了广泛的认可。但其内部结构复杂，存在降低矫顽力的相。对其相组成和微观结构的研究还很少。本研究涉及Co含量为0.5 wt%和16 wt%的磁铁粉末的制造，随后通过应用粉末冶金技术用于磁铁的生产。对磁体粉末和磁体进行了表征，发现磁体粉末中已经存在RE(Fe,Co)2相和RE2(Fe,Co)17相。发现了Co元素从晶界向2-14-1相迁移的现象。此外，在磁体中还发现了结晶的富钴薄层晶界相。最终，本研究为了解Nd-Fe-Co-B烧结磁体的相变和性能提供了参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.