| Influence of heat treatment on fracture and magnetic properties of radially oriented Sm2Co17 permanent magnets |
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| 作者姓名： | 田建军 曲选辉 张深根 陶斯武 杜学丽 |
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| 作者单位： | School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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| 基金项目： | 高等学校博士学科点专项科研项目;教育部跨世纪优秀人才培养计划 |
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| 摘 要： | The quenching, fracture and aging treatment of radially oriented Sm2Co17 ring magnets were investigated. The results indicate that the ring magnets have obvious anisotropy of thermal expansion, which easily leads to the splits of the magnets during quenching. The fracture is brittle cleavage fracture. The difference （Aa） of the expansion coefficient reaches the maximum value at 800-850 ℃. So, various quenching processes at different steps are adopted in order to reduce the splits. When the magnets are aged, 1：5 phase precipitates from the 2：17 matrix phase and forms a cellular microstructure with 2：17 phase. BHmax and JHc reach the maximum value 226 kJ/m^3 and 2 170 kA/m after being aged at 850 ℃ for 4 h and 8 h, respectively. The aging treatment at 850 ℃ has little influence on remanence（Br）, which can always keep a high value （≥1.0 T）. Through appropriate heat treatment, the ring magnets have uniform cellular microstructure and excellent magnetic properties： Br ≥ 1.0T, JHc ≥2 100 kA/m, BHmax ≥ 220 kJ/m^3.
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| 关 键 词： | 热处理 电磁铁 放射元素 金属断口 |
| 收稿时间： | 4 September 2006 |
| 修稿时间： | 2006-09-042007-03-13 |
Influence of heat treatment on fracture and magnetic properties of radially oriented Sm2Co17 permanent magnets |
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| TIAN Jian-jun,QU Xuan-hui,ZHANG Shen-gen,A. FARID,TAO Si-wu,DU Xue-li.Influence of heat treatment on fracture and magnetic properties of radially oriented Sm2Co17 permanent magnets[J].Transactions of Nonferrous Metals Society of China,2007,17(3):491-495. |
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| Authors: | TIAN Jian-jun QU Xuan-hui ZHANG Shen-gen A FARID TAO Si-wu DU Xue-li |
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| Affiliation: | School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | The quenching, fracture and aging treatment of radially oriented Sm2Co17 ring magnets were investigated. The results indicate that the ring magnets have obvious anisotropy of thermal expansion, which easily leads to the splits of the magnets during quenching. The fracture is brittle cleavage fracture. The difference (δa) of the expansion coefficient reaches the maximum value at 800–850 °C. So, various quenching processes at different steps are adopted in order to reduce the splits. When the magnets are aged. 1:5 phase precipitates from the 2:17 matrix phase and forms a cellular microstructure with 2:17 phase. BHmax and 3Hc reach the maximum value 226 kJ/m3 and 2170 kA/m after being aged at 850 °C for 4 h and 8 h, respectively. The aging treatment at 850 °C has little influence on remanence(Br), which can always keep a high value (≥1.0 T). Through appropriate heat treatment, the ring magnets have uniform cellular microstructure and excellent magnetic properties: Br1.0T, 3Hc≥2 100 kA/m, BHmax≥220 kJ/m3. |
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| Keywords: | Sm2Co17 permanent magnets radially oriented ring magnets heat treatment fracture magnetic properties |
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