具有永磁性能的SmCo2纳米晶合金化合物的制备与表征

梁海宁; 刘雪梅; 卢年端; 张久兴; 宋晓艳; 张哲旭

doi:10.3724/SP.J.1037.2010.00133

金属学报 >

2010 , Vol. 46 >Issue 8: 973 - 978

DOI: https://doi.org/10.3724/SP.J.1037.2010.00133

论文

具有永磁性能的SmCo₂纳米晶合金化合物的制备与表征

梁海宁 ,
刘雪梅 ,
卢年端 ,
张久兴 ,
宋晓艳 ,
张哲旭

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北京工业大学材料科学与工程学院, 北京 100124

梁海宁, 男, 1984年生, 硕士生

收稿日期: 2010-03-16

修回日期: 2010-04-29

网络出版日期: 2010-08-10

基金资助

国家自然科学基金项目50871001和教育部新世纪优秀人才项目NCET--06--0182资助

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PREPARATION AND CHARACTERIZATION OF SmCo₂NANOCRYSTALLINE ALLOY WITH PERMANENT MAGNETIC PROPERTIES

LIANG Hai-Ning ,
LIU Xue-Mei ,
LV Nian-Duan ,
ZHANG Jiu-Xin ,
SONG Xiao-Yan ,
ZHANG Zhe-Xu

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College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124

Received date: 2010-03-16

Revised date: 2010-04-29

Online published: 2010-08-10

Supported by

Supported by National Natural Science Foundation of China (No.50871001) and Program for New Century Excellent Talent from The Ministry of Education of China (No.NCET–06–0182)

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摘要

结合高能球磨和放电等离子烧结技术, 通过非晶合金粉末在烧结致密化的同时发生完全纳米晶化的机制, 制备出了致密的SmCo₂纳米晶合金块体材料,其平均晶粒尺寸约22 nm. 对SmCo₂纳米晶合金化合物的显微组织、晶体结构和相组成等的表征和分析表明, SmCo₂纳米晶合金在室温下不能以单相的形式存在, 发生分解形成SmCo₃, Sm₉Co₄和SmCo₂多相共存的合金体系; 而粗晶合金可以SmCo₂单相在室温下稳定存在.结合纳米晶热力学计算阐释了粗晶合金和纳米晶合金的相稳定性及其转变规律.对磁性能的测定表明, 与同种成分粗晶合金只有微弱的磁性能相比,SmCo₂纳米晶合金表现出明显的永磁特性, 且具有良好的综合磁性能.

关键词： Sm-Co合金; 纳米晶合金; 相稳定性; 显微结构; 磁性能

本文引用格式

梁海宁 , 刘雪梅 , 卢年端 , 张久兴 , 宋晓艳 , 张哲旭 . 具有永磁性能的SmCo₂纳米晶合金化合物的制备与表征[J]. 金属学报, 2010 , 46(8) : 973 -978 . DOI: 10.3724/SP.J.1037.2010.00133

Abstract

The nanocrystalline SmCo₂ bulk alloy with an average grain size of about 22 nm was prepared by combining high–energy ball milling and spark plasma sintering (SPS), in preparation the amorphous alloy powder obtained by milling was densified and crystallized during the SPS process. The microstructure, crystal structure and phase structure of such SmCo₂ were determined. These results show that the nanocrystalline SmCo₂ is not able to exist stably as a single phase at room emperature and decoposes into SmCo₃ and Sm₉Co₄ phases, different from the conventional coarse–grained SmCo₂ phase, which exiss stably at room temperature. Phase stability and transformation behavior have been explained by he nanocale thermodynamic simulation. Comparing with the coarse– grained SmCo₂ with very weak magnetic properties, the nnocrystalline SmCo₂ exhibits remarkable permanent magnetism and good overall magnetc properties.

Key words： Sm–Co alloy; nanocrystalline alloy; phase sability; microstructure; magnetic properties

参考文献

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