| 2Al/Fe_2O_3铝热剂的点火温度 |
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| 引用本文： | 张松林,武斌,秦志桂,张庆明. 2Al/Fe_2O_3铝热剂的点火温度[J]. 含能材料, 2010, 18(2): 162-166. DOI: 10.3969/j.issn.1006-9941.2010.02.009 |
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| 作者姓名： | 张松林 武斌 秦志桂 张庆明 |
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| 作者单位： | 北京理工大学宇航科学技术学院,北京,100081;西北核技术研究所,陕西,西安,710024;西北核技术研究所,陕西,西安,710024;北京理工大学宇航科学技术学院,北京,100081 |
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| 摘 要： | 为确定2Al/Fe2O3铝热剂的点火温度,对铝粉重量、电阻和形貌随温度变化的特性进行了实验观测,用均匀体系热爆炸理论计算了铝热剂球的临界点火温度并通过实验检验。结果表明,对于粒径约30μm的铝热剂,温度超过铝的熔点(933K)时铝粉氧化膜胀裂,流出的铝液铺展到邻近的氧化铁粉表面;点火温度约1600K,低于氧化铁分解点(1730K),点火前化学反应为液-固相型;点火温度与铝热剂球的体积无明显关系,均匀体系热爆炸理论不适用。
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| 关 键 词： | 应用化学 铝粉 氧化铁粉 铝热剂 氧化膜失效 点火温度 |
| 收稿时间： | 2009-05-25 |
| 修稿时间： | 2009-10-21 |
Ignition Temperature of 2Al/Fe2O3 Thermite |
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| ZHANG Song-lin,WU Bin,QIN Zhi-gui and ZHANG Qing-ming. Ignition Temperature of 2Al/Fe2O3 Thermite[J]. Chinese Journal of Energetic Materials, 2010, 18(2): 162-166. DOI: 10.3969/j.issn.1006-9941.2010.02.009 |
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| Authors: | ZHANG Song-lin WU Bin QIN Zhi-gui ZHANG Qing-ming |
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| Abstract: | Ignition temperature of 2Al/Fe2O3 thermite was studied by analysis and experiments. Failure temperature of aluminum particle oxide film was analyzed according to the weight,resistance and appearance of aluminum powder undergoing different temperatures. Critical ignition temperatures of thermite spheres with different radii were calculated by Frank-Kamenetskii theory and measured by a high-temperature muffle furnace. Results show that the protective film fails almost completely at the melting point of aluminum,and ignition occurs at temperature of about 1600 K, and the independent of the volume of thermite sphere and ignition temperature is not correctly calculated by the Frank-Kamenetskii theory of homogeneous combustible system. |
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| Keywords: | applied chemistry aluminum powder ferric oxide powder thermite failure of oxide film ignition temperature |
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