| 放电等离子烧结NdFeB磁体的氧化和腐蚀行为 |
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| 引用本文： | 岳明,刘卫强,王公平,张久兴,李涛.放电等离子烧结NdFeB磁体的氧化和腐蚀行为[J].材料研究学报,2004,18(2):167-170. |
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| 作者姓名： | 岳明 刘卫强 王公平 张久兴 李涛 |
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| 作者单位： | 1. 北京工业大学
2. 北京科技大学 |
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| 基金项目： | 国家自然科学基金
,
北京市教委科技发展计划项目
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北京市科技新星计划项目 |
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| 摘 要： | 采用放电等离子烧结技术制备了新型NdFeB磁体,研究了NdFeB磁体在湿热环境下的氧化行为和在电解质溶液中的电化学特性.在扫描电子显微镜下分析了磁体的显微组织结构和成分.结果表明,与传统烧结NdFeB磁体相比,新型磁体的显微组织特征为:主相Nd2Fe14B晶粒细小、均匀,富钕相在主相晶粒边界上分布较少,主要集中在三角晶界处.这种组织结构有效抑制了磁体沿富钕相发生的晶间腐蚀的过程,使磁体具有良好的耐腐蚀性能.
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| 关 键 词： | 材料失效与保护 耐腐蚀性 放电等离子烧结 NdFeB磁体 放电等离子烧结 磁体 氧化 腐蚀行为 spark plasma sintering NdFeB Magnet corrosion 耐腐蚀性能 过程 晶间腐蚀 发生 显微组织结构 晶界 分布 晶粒边界 富钕相 均匀 晶粒细 显微组织特征 传统烧结 |
| 文章编号： | 1005-3093(2004)02-0167-04 |
| 收稿时间： | 2004-05-21 |
| 修稿时间： | 2003年6月9日 |
Oxidation and corrosion behaviors of NdFeB Magnet prepared by spark plasma sintering |
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| YUE Ming,LIU Weiqiang,WANG GongPing,ZHANG Jiuxing,LI Tao Beijing University of Technology,Beijing University of Science and Technology Beijing.Oxidation and corrosion behaviors of NdFeB Magnet prepared by spark plasma sintering[J].Chinese Journal of Materials Research,2004,18(2):167-170. |
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| Authors: | YUE Ming LIU Weiqiang WANG GongPing ZHANG Jiuxing LI Tao Beijing University of Technology Beijing University of Science and Technology Beijing |
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| Affiliation: | YUE Ming,LIU Weiqiang,WANG GongPing,ZHANG Jiuxing,LI Tao Beijing University of Technology,Beijing 100022 University of Science and Technology Beijing,100083 |
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| Abstract: | Anisotropic NdFeB magnet was prepared by spark plasma sintering(SPS)technique.
Magnet with same composition was produced using conventional sintering method for comparison. The
electrochemical properties in electrolytes and reaction kinetics in oxidizing environments of the magnets
were studied. The microstructure and compositions of the magnets were observed with scanning
electron microscope and energy dispersive X-ray detector. Compared with conventional sintered NdFeB
maggnet,the SPS processed magnet has an original microstructure,i.6.the grain size of the Nd_2Fe_(14)B
main phase is fine and uniform,and the fine Nd-rich phase does not form along the grain boundaries
of main phase,but agglomerates into the triple junctions.Therefore,the pathways for corrosion
propagation are restricted and the inter-granular corrosion process is suppressed effectively. As a result.
the SPS NdFeB magnet possesses an excellent corrosion resistance. |
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| Keywords: | materials failure and protection corrosion resistance spark plasma sintering(SPS) NdFeB magnet |
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