Thermal Performance of Cu/Al Micron-Nanometer Composites with Tungsten Trioxide
A kind of core-shell Cu/Al micron-nanometer composite has been prepared by displacement method, in which the micron sized aluminum powders are coated in the nano sized Cu shells. Morphologies of the samples were examined by SEM. The thermal performance of Cu/Al-WO3 and Al-WO3 mixtures are investigated with DSC as a function of the equivalence ratio of aluminum to WO3 and heating rates in the air. Several parameters have been used to characterize the performance of thermite reaction, including the maximum reaction rate, onset and peak temperatures, and heat released. Results indicate that the reactivity of Cu/Al-WO3 is significantly higher than that of Al-WO3, but depending strongly on equivalence ratio and heating rates. It reached the optimum equivalence when the composite is fuel slightly rich. And lower heating rate will be deleterious to the progresses of reactions. Meanwhile, mechanisms of reaction processes have been proposed.
energetic materials micron-nanometer composites Al powders WO3 thermite reaction
JIANG Wei WANG Yi LI Fengsheng
National Special Superfine Powder Engineering Research Center of China, Nanjing University of Scicence and Technology, Nanjing 210094, Jiangsu, China
国际会议
西安
英文
213-216
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）