Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (11): 1753-1759.doi: 10.3866/PKU.WHXB20071119

• ARTICLE • Previous Articles     Next Articles

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

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