In Situ Generation of Ni Nanoparticles on Al Powder Surface via F‐Ion‐Mediated Oxide Layer Disruption: Enhanced the Energy Release of Oxidizer/Al Composite Energetic Microunits

原位 材料科学 复合数 图层(电子) 纳米颗粒 氧化物 离子 化学工程 纳米技术 复合材料 冶金 化学 有机化学 工程类
作者
Yong Kou,Ronghuan Yang,Qiangqiang Lu,Hongyu Yang,Jiahao Yu,Jun Di,Guigao Liu,Fengqi Zhao,Lei Xiao,Wei Jiang,Xiaolong Fu,Gazi Hao
出处
期刊:Small [Wiley]
卷期号:21 (32): e2504218-e2504218 被引量:4
标识
DOI:10.1002/smll.202504218
摘要

Abstract Designing stable and efficient catalysts is always an immeasurable challenge. It is difficult to achieve efficient dispersion and effective catalysis of catalysts by traditional mixing method. In this study, fuel–catalyst composites with high performance are prepared and aluminum fluoride (AlF 3 ) encapsulation of nickel (Ni) nanoparticles is also achieved, and it leads to a significant increase in the peak heat flow and heat release during the thermal oxidation process. The loading of Ni nanoparticles on the surface of aluminum (Al) powders improves their dispersion and thus enhances the thermal decomposition rate of the ammonium perchlorate (AP), and reduces its thermal decomposition temperature by 92.14 °C. Meanwhile, the Ni nanoparticles can act as oxygen transport channels to promote rapid oxygen translocation and rapid oxidation of reactive Al powders through the self‐cycling aluminothermic reaction. Furthermore, it also enhances the combustion efficiency of the energetic microunits, resulting in an increase in the combustion flame area, flame brightness, and flame growth rate, while the combustion duration is significantly shortened. In conclusion, the new method proposed in this study is able to significantly improve the performance of the oxidant/fuel composite energetic microunits, which is expected to contribute to their widespread application in propellants.
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