The Effect of CuO on the Thermal Behavior of the High-Energy Combustion Agent of the Al/MnO₂ System

Abstract

In this work, the effect of CuO addition into the high-energy combustion agent of Al/MnO 2 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. en, in order to find out the underlying reasons, CuO effects on the thermal behavior of Al/MnO 2 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 thermogravimetricdifferential 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/MnO 2 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.

Thermal Analysis and Pyrolytic Behavior of Bimetal and Double Oxidant Thermite Al/Mg/MoO3/CuO

“…Its average step‐up rate was 28.29 MPa/s, much higher than 6.84 MPa/s of Al/Fe 2 O 3 /CuO. Wang [28] studied the effect of CuO addition on the Al/MnO 2 thermite system and found that adding CuO would lead to a sharp increase in gas content in the whole reaction process, accompanied by rise in reaction pressure. Adding an appropriate amount of CuO was beneficial to the continuous progress of the reaction.…”