Magnetic hardening strategy for high-performance Sm(CoFeCuZr)z sintered permanent magnets prepared by dual-alloy process

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2026-03-01 Epub Date: 2026-04-24 DOI:10.1016/S1003-6326(25)67006-3

Jian-jun YANG , Dong-tao ZHANG , Yu-qing LI , Zan LONG , Cheng-zhen MENG , Wei-qiang LIU , Ming YUE

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引用次数: 0

Abstract

To improve the overall magnetic properties of Sm(CoFeCuZr)_z sintered magnets, a dual-alloy sintering process that involves mixing high-iron, low-copper powders with low-iron, high-copper powders was systematically investigated. The results demonstrate that this method significantly improves the Cu-lean phenomenon at the grain boundaries, achieves multiscale uniform microstructures, greatly enhances the pinning field strength, and ultimately produces a high-performance dual-alloy magnet with a maximum energy product ((BH)_max) exceeding 240 kJ/m³ and an intrinsic coercivity (H_cj) exceeding 2400 kA/m. In particular, when 35 wt.% of low-iron, high-copper alloy powder is incorporated, the dual-alloy magnet achieves a remanence of 1.13 T, H_cj of 2691.2 kA/m and (BH)_max of 248 kJ/m³. To evaluate the overall magnetic performance, the sum of H_cj (in kA/m) and (BH)_max (in kJ/m³) is used as a combined parameter, yielding a value of 2939.2. Compared with single-alloy magnets of the same composition, the dual-alloy sintering process yields magnets with a more uniform elemental distribution and superior magnetic properties.

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双合金法制备高性能Sm(CoFeCuZr)z烧结永磁体的磁硬化策略

为了提高Sm(CoFeCuZr)z烧结磁体的整体磁性能，系统研究了高铁、低铜粉末与低铁、高铜粉末混合的双合金烧结工艺。结果表明，该方法显著改善了晶界Cu-lean现象，实现了多尺度均匀组织，大大提高了钉钉磁场强度，最终生产出最大能积（BH）max超过240 kJ/m3，固有矫顽力（Hcj）超过2400 kA/m的高性能双合金磁体。特别是，当加入35 wt.%的低铁高铜合金粉末时，双合金磁铁的剩余量为1.13 T， Hcj为2691.2 kA/m, (BH)max为248 kJ/m3。为了评估整体的磁性能，Hcj（单位：kA/m）和（BH）max（单位：kJ/m3）的总和作为一个组合参数，得到2939.2的值。与相同成分的单合金磁体相比，双合金烧结工艺生产的磁体元素分布更均匀，磁性能更优越。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.