[1]李雨,俞能君,刘冰,等.Cr掺杂对Sm2Co17型烧结永磁体抗弯强度、微结构的影响[J].中国材料进展,2025,44(11):1045-1053.[doi:10.7502/j.issn.1674-3962.202406013]
　LI Yu,YU Nengjun,LIU Bingyu,et al.The Influence of Cr Doping on the Flexural Strength and Microstructure of Sm2Co17 Type Sintered Permanent Magnet[J].MATERIALS CHINA,2025,44(11):1045-1053.[doi:10.7502/j.issn.1674-3962.202406013]
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Cr掺杂对Sm2Co17型烧结永磁体抗弯强度、微结构的影响()

中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
44
期数:
2025年11
页码:
1045-1053
栏目:
出版日期:
2025-11-28

文章信息/Info

Title:
The Influence of Cr Doping on the Flexural Strength and Microstructure of Sm2Co17 Type Sintered Permanent Magnet
文章编号:
1674-3962(2025)11-1045-09
作者:
李雨;  俞能君; 刘冰; 刘恋; 张林; 葛洪良
1中国计量大学 材料与化学学院，浙江 杭州 310018 2绵阳量大技术创新服务有限公司，四川 绵阳 621000
Author(s):
LI Yu; YU Nengjun;  LIU Bingyu;  LIU lian;  ZHANG Lin;  GE Hongliang
1.College of Materials and Chemistry, China Jiliang University, Hangzhou 310018, China 2.Mianyang Liangda Technology Innovation Service Co., Ltd,Mianyang 621000, China
关键词:
Sm2Co17型烧结永磁体; Cr掺杂; 高抗弯强度; 显微组织; 元素分布
Keywords:
Sm2Co17 type sintered permanent magnets; Cr doping; high flexural strength; microstructure; element distribution
分类号:
TM273
DOI:
10.7502/j.issn.1674-3962.202406013
文献标志码:
A
摘要:
Sm2Co17型烧结永磁体具有优异的磁性能、热稳定性和耐蚀性，但由于其主相2∶17R相晶体结构滑移系少、对称性差等导致永磁体表现出较低的抗弯强度。研究了Cr元素添加对Sm(Co0.68Fe0.22Cu0.06Zr0.04)7.5烧结磁体微观结构和抗弯强度的影响。研究发现，适量Cr添加可以有效提高Sm2Co17型烧结永磁体的抗弯强度，当添加量为2%（质量分数）时，磁体的抗弯强度为180.12 MPa，较未添加Cr的磁体提升了约47.75%。微结构和元素分布研究发现Cr元素在磁体中均匀分布，对磁体的相组成和断裂机理基本没有影响，但添加了Cr元素的磁体在晶界处形成了细小而不规则的晶粒，这种细小晶粒中的胞状组织尺寸明显小于未添加Cr的磁体，形成了类似细晶强化的效果，提高了磁体的抗弯强度。本研究提出了通过添加Cr元素诱导Sm2Co17型烧结永磁体内部形成细小不规则晶粒及细小不规则晶粒内部的细小胞状组织以提升磁体抗弯强度的新方法，有助于优化钐钴磁体的性能。
Abstract:
The Sm2Co17 type sintered permanent magnets possess excellent magnetic properties, thermal stability and corrosion resistance. However, due to the primary 2∶17R phase crystal structure having few slip systems and poor symmetry, these permanent magnets exhibit relatively low flexural strength. This study investigated the effects of Cr element addition on the microstructure and flexural strength of Sm(Co0.68Fe0.22Cu0.06Zr0.04)7.5 sintered magnets. The research found that an appropriate amount of Cr addition can effectively enhance the flexural strength of the Sm2Co17 type sintered permanent magnets. When the Cr addition was 2wt%, the flexural strength of the magnet reached 180.12 MPa, which was about 47.75% higher than that of the magnet without Cr addition. Microstructure and elemental distribution analysis revealed that the Cr element is uniformly distributed within the magnet, having no significant impact on the phase composition and fracture mechanism of the magnet. However, the magnets with Cr addition formed fine irregular grains at the grain boundaries, and the size of the cellular structures within these fine grains was significantly smaller than that of the magnet without Cr addition. This resulted in a fine-grain strengthening effect, improving the flexural strength of the magnets. This study proposed a new method to enhance the flexural strength of Sm2Co17 type sintered magnets by inducing the formation of fine irregular grains and their internal fine cellular structures through the addition of Cr element, which helped optimize the performance of samariumcobalt magnets.

备注/Memo

备注/Memo:
收稿日期：2024-06-11修回日期：2024-08-30 基金项目：国家重点研发计划青年科学家项目（2021YFB3501600）;国家自然科学基金面上项目（52371201）;中国科协青年人才托举工程项目（2022QNRC001）;浙江省重点研发计划项目（2024C01189） 第一作者：李雨，男，2000年生，硕士研究生 通讯作者：俞能君，男，1990年生，副研究员，硕士生导师， Email:nengjunyu@cjlu.edu.cn
更新日期/Last Update: 2025-10-30