| 核-壳结构Cu/Al微纳米复合材料与WO3的热反应性能 |
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| 引用本文： | 王毅,姜炜,程志鹏,张先锋,安崇伟,宋小兰,李凤生.核-壳结构Cu/Al微纳米复合材料与WO3的热反应性能[J].物理化学学报,2007,23(11):1753-1759. |
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| 作者姓名： | 王毅 姜炜 程志鹏 张先锋 安崇伟 宋小兰 李凤生 |
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| 作者单位： | National Special Superfine Powder Engineering Research Center, Nanjing University of Science & Technology, Nanjing 210094, P. R. China; College of Mechanical Engineering, Nanjing University of Science & Technology, Nanjing 210094, P. R. China |
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| 基金项目： | 国家自然科学基金;解放军总装备部预研项目 |
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| 摘 要： | 采用置换法通过对溶液浓度的控制实现了纳米Cu颗粒在微米Al粉表面定量、快速地化学沉积, 制备出核-壳结构的Cu/Al微纳米复合粒子, 并用SEM、EDS和XRD技术进行表征. 在此基础上, 利用DSC 分析了Cu/Al-WO3的热反应性能, 对比了Al-WO3与Cu/Al-WO3在不同化学配比下的热反应历程, 同时分别提出了其相应的反应机理. 实验结果表明, Cu/Al微纳米复合材料与WO3的热反应活性明显高于传统微米级Al粉, 并且在还原剂Cu/Al轻微过量时该热反应达到最佳效果. 通过对Al粉表面改性, 热反应的活化能降低了68.185 kJ·mol-1.
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| 关 键 词： | 纳米铜 Al 粉 WO3 微纳米复合材料 铝热反应 动力学 |
| 收稿时间： | 2007-03-18 |
| 修稿时间： | 2007-03-18 |
Thermal Performance Investigation of Core-Shell Cu/Al Micron-Nano Composites with WO3 |
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| WANG Yi,JIANG Wei,CHENG Zhi-Peng,ZHANG Xian-Feng,AN Chong-Wei,SONG Xiao-Lan,LI Feng-Sheng.Thermal Performance Investigation of Core-Shell Cu/Al Micron-Nano Composites with WO3[J].Acta Physico-Chimica Sinica,2007,23(11):1753-1759. |
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| Authors: | WANG Yi JIANG Wei CHENG Zhi-Peng ZHANG Xian-Feng AN Chong-Wei SONG Xiao-Lan LI Feng-Sheng |
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| Institution: | National Special Superfine Powder Engineering Research Center, Nanjing University of Science & Technology, Nanjing 210094, P. R. China; College of Mechanical Engineering, Nanjing University of Science & Technology, Nanjing 210094, P. R. China |
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| Abstract: | A kind of core-shell Cu/Al powder has been prepared via a facile displacement method,in which the micron-sized Al cores were coated in Cu shells.SEM,EDS and XRD were employed to characterize the samples.The thermal performance of micron-sized AI particles and Cu/Al micron-nano composites with WO_3 were investigated by differential scanning calorimetry (DSC) as a function of the equivalence ratio.Mechanisms of thermite reactions have been proposed.Results indicated that the reactivity of Cu/Al micron-nano composites with WO_3 was significantly higher than that of micron-sized Al particles,but depending strongly on equivalence ratio.The optimum equivalence was reached when the composites were fuel slightly rich.The activation energy of Cu/AI-WO3 was decreased by 68.185 kJ.mo1~(-1) compared with that of Al-WO_3. |
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| Keywords: | WO3 |
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