Probing the reaction mechanism of Al/CuO nanocomposites doped with ammonium perchlorate

The oxide shell of Al nanoparticles (Al NPs) prevented further reaction of Al/CuO nanothermites to reduce the Al utilization efficiency and the performance of the nanothermites. However, the performance of Al/CuO nanothermites can be improved by adding Ammonium Perchlorate (AP). In this work, in order to confirm and explain the enhancement mechanism of AP on Al/CuO nanothermites, Al/CuO/NC and Al/CuO/NC/AP composites were prepared by electrospray method. The composites were characterized by DSC/TG, XRD, SEM and TEM. Meanwhile, the ignition temperature and the time-resolved analysis of rapid pyrolysis chemistry of the composites were tested using T-jump and time-of-flight mass spectrometry, respectively. The results show that Al NPs of Al/CuO/NC/AP composite is hollow compared to Al/CuO/NC composite after reaction. Al NPs and CuO NPs reduce the decomposition temperature and facilitate the rapid decomposition of the AP, and the decomposition products of AP can destroy the oxidation layer of Al NPs. This result facilitates the further conduct of the thermite reaction. The relationship between Al/CuO/NC composites and AP is interaction.