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Thermodynamics and performance of Al/CuO nanothermite with different storage time
Authors:Cheng-ai Wang  Jian-bing Xu  Yun Shen  Yue-ting Wang  Teng-long Yang  Ze-hua Zhang  Fu-wei Li  Rui-qi Shen  Ying-hua Ye
Affiliation:School of Chemical Engineering,Nanjing University of Science&Technology,Nanjing,210094,People's Republic of China;Micro-Nano Energetic Devices Key Laboratory of MIIT,Nanjing,210094,People's Republic of China
Abstract:The storage stability of energetic materials is important for its application. Here, the storage stability of Al/CuO nanothermite, which was prepared by electrospray method and stored with different storage time, was systematically researched. The activation energy of Al/CuO nanothermite was calculated by differential scanning calorimetry (DSC). The ignition temperature and the curve pressure history of Al/CuO nanothermite was measured using ignition temperature measuring device and constant-volume pressurization tests, respectively. Further, the thermites were characterized by X-ray Diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and Transmission electron microscopy (TEM). The results show that the morphology of the thermites did not change significantly. The activation energy was decreased from 254.1 kJ/mol to 181.8 kJ/mol after storage for 13 months. When stored for 0, 7 and 13 months, the peak pressures of Al/CuO nanothermite were 685.8 kPa, 626.3 kPa and 625.5 kPa, respectively. In addition to the ignition temperature, it was 775 ℃, 739 ℃ and 754 ℃, respectively. This result indicated that the ignition and combustion properties of Al/CuO nano-thermite are obviously reduced when stored for a long time, at room temperature.
Keywords:Al/CuO  Nanothermites  Stroage stability  Thermodynamics
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