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Thermal decomposition of pyrotechnic mixtures containing either aluminum or magnesium powder as fuel

机译：含有铝或镁粉作为燃料的烟火混合物的热分解

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Thermal behavior of energetic materials is critical to safe production, storage, handling or even demilitarization. In this work, the thermal behavior of Al, Mg, CuO, KMnO_4 and also three mixtures containing Al + CuO, Mg + CuO and Mg + KMnO_4 were studied experimentally using differential scanning calorimetry and thermogravimetry. These mixtures are sometimes used as pyrotechnic mixtures in military industries. Also, the influence of different heating rates (5, 10, 15 and 20 ℃/min) on the DSC behavior of the mixtures was verified. The results showed that as the heating rate was increased, melting points and ignition temperatures of the mixtures were increased. On the other hand, TG-DSC analysis for Mg + KMnO_4 mixture indicates that this mixture melts at 283.0 ℃ and decomposed at 292.1 ℃. By replacing KMnO_4 with CuO as the oxidizer of the magnesium, these temperatures enhanced to 368.7 ℃ and 408.3 ℃, respectively. However, replacing Mg with Al in the Mg/CuO mixture decreases the melting and ignition temperatures of the mixture to 231.4 ℃ and 271.9 ℃, respectively. The activation energy for each pyrotechnic mixture was computed. Also, the values of △S~#, △H~# and △G~# of their reaction were calculated.
机译：高能材料的热行为对于安全生产，存储，处理甚至非军事化至关重要。在这项工作中，使用差示扫描量热法和热重分析法对Al，Mg，CuO，KMnO_4以及包含Al + CuO，Mg + CuO和Mg + KMnO_4的三种混合物的热行为进行了实验研究。这些混合物有时在军事工业中用作烟火混合物。此外，验证了不同加热速率（5、10、15和20℃/ min）对混合物DSC行为的影响。结果表明，随着加热速率的增加，混合物的熔点和着火温度均升高。另一方面，对Mg + KMnO_4混合物的TG-DSC分析表明，该混合物在283.0℃下熔融并在292.1℃下分解。通过用CuO代替KMnO_4作为镁的氧化剂，这些温度分别提高到368.7℃和408.3℃。然而，在Mg / CuO混合物中用Al代替Mg会使混合物的熔化和着火温度分别降低到231.4℃和271.9℃。计算每种烟火混合物的活化能。另外，计算它们的反应的△S〜＃，△H〜＃和△G〜＃的值。

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