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

机译：探讨掺杂氢氯酸铵的Al / CuO纳米复合材料的反应机理

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摘要

The oxide shell of Al nanoparticles (Al NPs) prevents further reaction of Al/CuO nanothermites which reduces 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 using the electrospray method. The composites were characterized by differential scanning calorimetry/thermogravimetric, x-ray diffraction, scanning electron microscope and transmission electron microscopy. Meanwhile, the ignition temperature and the time-resolved analysis of the 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 are 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 the AP can destroy the oxidation layer of Al NPs. This result facilitates the further conduct of the thermite reaction. A mutually reinforcing relationship exists between the Al/CuO/NC composites and AP.
机译：Al纳米颗粒（Al NPS）的氧化物壳可防止Al / CuO纳米纳米的进一步反应，这降低了Al利用效率和纳米热质的性能。然而，通过加入高氯酸铵（AP），可以改善Al / CuO纳米热酯的性能。在这项工作中，为了确认和解释AP上AP上的增强机制，使用电喷雾方法制备Al / CuO / Nc和Al / CuO / NC / AP复合材料。通过差示扫描量热法/热重分析，X射线衍射，扫描电子显微镜和透射电子显微镜，表征复合材料。同时，使用T跳跃和飞行时间质谱法检测复合材料的快速热解化学的点火温度和时分分辨分析。结果表明，与反应后的Al / CuO / NC复合材料相比，Al / CuO / NC / AP复合材料的Al NP是中空的。 Al NPS和CuO NPS降低分解温度并促进AP的快速分解，AP的分解产物可以破坏Al NP的氧化层。该结果有助于进一步进行热反应。在Al / CuO / NC复合材料和AP之间存在相互增强的关系。

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