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Enhancing the Combustion Performance of Metastable Al@AP/PVDF Nanocomposites by Doping with Graphene Oxide
Engineering ( IF 12.8 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.eng.2020.02.014
Shuwen Chen , De-Yun Tang , Xue-Xue Zhang , Jie-Yao Lyu , Wei He , Peijin Liu , Qi-Long Yan

Abstract A new group of energetic metastable intermixed composites (MICs) was designed and fabricated by means of the spray granulation technique. These MICs are composed of aluminum (Al) as the fuel, ammonium perchlorate (AP) and polyvinylidene fluoride (PVDF) as the co-oxidizer. The AP/PVDF ratio was optimized by taking the maximum energy release as the criteria. A minor content of graphene oxide (GO) was also doped in the MICs to act as both lubricant and catalyst. It was shown that Al@AP/PVDF with 0.2% GO has the greatest density (2.57 g·cm–3) and highest heat of reaction (5999.5 J·g–1). These values are much higher than those of Al@AP/PVDF (2.00 g·cm–3 and 5569.8 J·g–1). The inclusion of GO increases the solid-state reaction rate of Al@AP/PVDF and improves the thermal stability. The flame propagation rate was increased up to 4.71 m·s–1 by doping with 0.2% GO, and was about 10.7% higher than that of Al@AP/PVDF. Al@AP/PVDF-GO has a better interfacial contact and particle distribution, which results in an improved heat-transfer rate, freedom from the agglomeration of nano-Al particles, and an improved combustion reaction rate. This work demonstrates a new strategy to improve the energy release rate and combustion efficiency of Al-based MICs.

中文翻译:

通过掺杂氧化石墨烯提高亚稳态 Al@AP/PVDF 纳米复合材料的燃烧性能

摘要 采用喷雾造粒技术设计并制备了一组新型高能亚稳态混合复合材料(MICs)。这些 MIC 由作为燃料的铝 (Al)、作为助氧化剂的高氯酸铵 (AP) 和聚偏二氟乙烯 (PVDF) 组成。AP/PVDF 比值以最大能量释放为标准进行优化。MIC 中还掺杂了少量氧化石墨烯 (GO) 以充当润滑剂和催化剂。结果表明,含 0.2% GO 的 Al@AP/PVDF 具有最大的密度(2.57 g·cm-3)和最高的反应热(5999.5 J·g-1)。这些值远高于 Al@AP/PVDF(2.00 g·cm-3 和 5569.8 J·g-1)。GO的加入提高了Al@AP/PVDF的固态反应速率并提高了热稳定性。火焰传播速率增加到 4。通过掺杂 0.2% GO 得到 71 m·s–1,比 Al@AP/PVDF 高约 10.7%。Al@AP/PVDF-GO 具有更好的界面接触和颗粒分布,从而提高了传热速率,避免了纳米铝颗粒的团聚,并提高了燃烧反应速率。这项工作展示了一种提高铝基 MIC 的能量释放率和燃烧效率的新策略。
更新日期:2020-09-01
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