Abstract
In this work, the effect of CuO addition into the high-energy combustion agent of Al/MnO2 system was studied. First, the combustion experiments of five samples with different contents had been carried out, in which CuO was found capable of influencing the flame ejection to a great extent. Then, in order to find out the underlying reasons, CuO effects on the thermal behavior of Al/MnO2 system were analyzed via theoretical calculations of Gibbs free energy and enthalpy changes. In addition, field emission scanning electron microscopy (FE-SEM) that could characterize the mixture morphology and thermogravimetric-differential scanning calorimetry (TG-DSC) that could indentify the exothermic and endothermic reactions and measure mass change were carried out. Finally, on the basis of all experimental findings, it was suggested that addition of CuO into Al/MnO2 system could result in dramatic increase of gas content throughout the reaction and the consequent high pressure. Also, speed of flame injection and heat released in the high-temperature area would thus be conducive to the continuous exothermic behavior of the reaction.
Highlights
Along with the rapid development of material science in recent years, much more attention has been paid to the research of micro- and nanoscale super thermites because the micro- and nanoscale energetic materials exhibit significantly increased overall performance, especially in the aspect of safety, compared with traditional energetic materials [10]
Kim et al [12] investigated the thermite reactions between Al/CuO nanowires and nanopowders through field emission scanning electron microscopy (FE-SEM) and energy dispersive spectroscopy (EDS), which suggested that the heat flow and energy release were examined as well
HSC Chemistry 6.0 contains many functions and submodules, and here we chose to use its “reaction calculation” module to simulate the parameters of the relevant thermochemical reactions, and we got the Gibbs selfenergy and chemical reaction enthalpy values from 0 to 1500°C. en, the Arrhenius formula and Eyring equation can be found on the right. e burning rate and heat release of the flame type high-energy combustion agent were evaluated. e software interface of HSC Chemistry could be found as Figure 4 and the values of Gibbs free energy and enthalpy changes of five samples could be found in Tables 2 and 3
Summary
Along with the rapid development of material science in recent years, much more attention has been paid to the research of micro- and nanoscale super thermites because the micro- and nanoscale energetic materials exhibit significantly increased overall performance, especially in the aspect of safety, compared with traditional energetic materials [10]. E software interface of HSC Chemistry could be found as Figure 4 and the values of Gibbs free energy and enthalpy changes of five samples could be found in Tables 2 and 3. Samples with greater content of CuO exhibited smaller absolute value of Gibbs free energy at a certain temperature, lower k values could be obtained from the Eyring equation.
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