物理化学学报 >> 2007, Vol. 23 >> Issue (11): 1753-1759.doi: 10.3866/PKU.WHXB20071119

研究论文 上一篇    下一篇

核-壳结构Cu/Al微纳米复合材料与WO3的热反应性能

王毅; 姜炜; 程志鹏; 张先锋; 安崇伟; 宋小兰; 李凤生   

  1. 南京理工大学国家特种超细粉体工程技术研究中心, 南京 210094; 南京理工大学机械工程学院, 南京 210094
  • 收稿日期:2007-03-18 修回日期:2007-05-28 发布日期:2007-11-01
  • 通讯作者: 李凤生 E-mail:wangyi528528@yahoo.com.cn

Thermal Performance Investigation of Core-Shell Cu/Al Micron-Nano Composites with WO3

WANG Yi; JIANG Wei; CHENG Zhi-Peng; ZHANG Xian-Feng; AN Chong-Wei; SONG Xiao-Lan; LI Feng-Sheng   

  1. 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
  • Received:2007-03-18 Revised:2007-05-28 Published:2007-11-01
  • Contact: LI Feng-Sheng E-mail:wangyi528528@yahoo.com.cn

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.

关键词: 纳米铜, Al 粉, WO3, 微纳米复合材料, 铝热反应, 动力学

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 Al particles and Cu/Al micron-nano composites with WO3 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 WO3 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/Al-WO3 was decreased by 68.185 kJ·mol-1 compared with that of Al-WO3.

Key words: Nano Cu, Al powders, WO3, Micron-nano composites, Thermite reaction, Kinetics

MSC2000: 

  • O644