Formation of Cu layer on Al nanoparticles during thermite reaction in Al/CuO nanoparticle composites: Investigation of off-stoichiometry ratio of Al and CuO nanoparticles for maximum pressure change

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We analyzed thermite reactions in composites comprised of Al and CuO nanoparticles (NPs) and investigated pressure change and pressurization rate as a function of composition. Although the stoichiometric ratio for the thermite reaction between Al and CuO is 2:3, our experiments show that the maximum pressurization rate occurs in Al-rich thermite composites. Transmission electron microscopy analysis of the reaction products revealed that a considerable number of Al NPs are coated with Cu layer. We attribute the formation of Cu layer on the surface of Al NPs during the reaction to the off-stoichiometry, since the Cu layer renders Al NPs relatively less reactive. Based on our analysis of the experimental data, we propose a mechanism in which gasified Cu grows into Cu layer, as the gas-phase Cu species travels from reaction sites to unreacted Al NP surface. Analysis on characteristic timescale of heat and mass transfer reveals that condensation of Cu on Al NPs occurs faster than the overall thermite reaction.
Publisher
ELSEVIER SCIENCE INC
Issue Date
2015-10
Language
English
Article Type
Article
Citation

COMBUSTION AND FLAME, v.162, no.10, pp.3823 - 3828

ISSN
0010-2180
DOI
10.1016/j.combustflame.2015.07.019
URI
http://hdl.handle.net/10203/203656
Appears in Collection
CBE-Journal Papers(저널논문)
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