| Sm2Fe17合金的热稳定性 |
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| 引用本文： | 邓庚凤, 孙光飞, 陈菊芳, 方克明. Sm2Fe17合金的热稳定性[J]. 工程科学学报, 2007, 29(4): 390-393. DOI: 10.13374/j.issn1001-053x.2007.04.018 |
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| 作者姓名： | 邓庚凤 孙光飞 陈菊芳 方克明 |
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| 作者单位： | 3.4. 北京科技大学材料科学与工程学院, 北京 100083 |
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| 摘 要： | 用热重/差热(TG/DTA)分析法研究了粒度及升温速度对Sm2Fe17合金热稳定性的影响,结合XRD物相分析结果说明Sm2Fe17合金氧化过程中发生的化学反应,用Kinssinger法计算了Sm2Fe17合金被氧化所需的表观活化能并推断了其反应机理.结果表明:Sm2Fe17合金粉的粒度越细,其热稳定性越差;升温速度越快,Sm2Fe17合金的氧化温度增高,放出的热量减小.Kinssinger法计算Sm2Fe17合金在低温氧化时的表观活化能为162kJ·mol-1,在高温氧化时为189.8kJ·mol-1.
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| 关 键 词： | 稀土永磁 热稳定性 活化能 热分析 X射线衍射分析 |
| 收稿时间： | 2006-01-29 |
| 修稿时间： | 2006-07-10 |
Thermal stability of Sm2Fe17 alloy |
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| DENG Gengfeng, SUN Guangfei, CHEN Jufang, FANG Keming. Thermal stability of Sm2Fe17 alloy[J]. Chinese Journal of Engineering, 2007, 29(4): 390-393. DOI: 10.13374/j.issn1001-053x.2007.04.018 |
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| Authors: | DENG Gengfeng SUN Guangfei CHEN Jufang FANG Keming |
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| Abstract: | The effects of particle size and heating rate on the thermal stability of Sm2Fe17 alloy were investigated by TG/DTA technique. Chemical reactions during the oxidation of Sm2Fe17 alloy were confirmed with XRD and TG/DTA results. The apparent activation energy of the oxidation of Sm2Fe17 alloy was calculated by the Kinssinger equation and the reaction mechanism was deduced. The results show that the thermal stability of Sm2Fe17 alloy decreases with the decrease in particle size; and the sooner the heating rate is, the higher temperature needs for Sm2Fe17 alloy being oxidized and the less thermal it gives out. Further studies indicate that the apparent activation energies of low-temperature oxidation and high-temperature oxidation of Sm2Fe17 alloy are 162 kJ·mol-1 and 189.8 kJ·mol-1, respectively. |
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| Keywords: | rare earth permanence magnet thermal stability activation energy thermal analysis X-ray diffraction analysis |
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