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Al/Teflon反应材料的冲击压缩特性与点火行为
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TQ560.7

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Impact Compression Characteristics and Ignition Behavior of Al/Teflon Reactive Materials
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    摘要:

    为探究Al/Teflon反应材料的力学特性和撞击点火行为,加压烧结Al/Teflon反应材料试件并进行霍普金森压杆实验(SHPB),通过分析动态压缩过程中材料压缩-强化-卸载各阶段特性,获得在不同加载速度下的应力、应变时程曲线;并且,通过SHPB实验系统对Al/Teflon反应材料进行高速度加载研究材料的点火行为。结果表明:Al/Teflon材料具有应变率强化效应;点火反应普遍发生在2~3次冲击过程中,且材料的反应过程均处于μs级;火焰演化面积随时间呈先增长后下降的趋势,点火延迟时间随加载速度增加逐渐减小,发生反应的临界应力随加载速度的增加而增大。

    Abstract:

    In order to study the thermal decomposition of nano ammonium perchlorate (AP), the AP samples with nanometer structure were prepared by rapid freeze-drying method. The morphology, structure and thermal decomposition property of the samples were characterized and analyzed, the apparent activation energy of samples were also calculated by Kissinger formula, then the effect of nano structure on the thermal decomposition of AP was discussed. The results show that the nanostructured AP obtained by rapid freeze-drying has nanoscale network framework and good crystal stability. The peak thermal decomposition temperature of nanometer AP is 424.2℃, which is 4.4℃ lower than that of raw material AP. Compared with the raw material, the apparent activation energy of nanometer AP is 167.8kJ/mol, which is decreased by 114.8kJ/mol. The study indicate that the nanometer AP samples prepared by rapid freeze-drying have more surface active atoms and groups, the samples are easy to be activated, which promote the thermal decomposition of AP.

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  • 在线发布日期: 2021-12-15
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