| Flash ignition refers to the rapid ignition and combustion of target materials irradiated by using the low energy density light radiation of ordinary flash,such as mobile phone or camera flash.Compared with the traditional ignition system,flash ignition has the advantages of fast and convenient,high efficiency and flexibility,distributed multi-point ignition,and stable ignition under severe extreme conditions.It is of great significance for the development of fast ignition/micro-ignition devices in the field of national security.The core scientific problem is how to enhance the absorption of incident light energy greatly and realize flash ignition at lower energy through the design and preparation of material system.In this paper,the experimental and on-line test system of energetic composites flash ignition and combustion is designed and built independently,and the complete ignition and combustion image time-resolved observation system and ignition energy test system are established.Flash ignition experiments of C/Al nanocomposite energetic materials were carried out.The ignition process was analyzed by high-speed photography,ignition energy testing,TG-DSC,XRD,SEM,etc.The combustion law and characteristics of energetic materials with different material components and different composite methods were studied.According to the change of microstructure of energetic materials before and after flash ignition,the mechanism of flash ignition is explored.Firstly,Al/CNTs nanocomposites were prepared by mechanical mixing method.The ignition and combustion patterns of the nanocomposites were systematically studied.The results show that with the increase of CNTs content,the minimum ignition energy of Al/CNTs composites first decreases and then increases,and the minimum ignition energy of Al/CNTs-5 is 0.374 J/cm2.The main combustion products of Al/CNTs composites are Al2O3,Al4C3 and Fe2O3.Thermal analysis（DSC）results show that the total heat release of Al/CNTs composites increases with the increase of CNTs content.Secondly,the two-dimensional ignition film material of graphene oxide film loaded with aluminum nanoparticles（Al/GO）was prepared by vacuum filtration method,and the ignition and combustion patterns of the material were systematically studied.The results show that the combustion rate of Al/GO composite film is faster than that of pure GO,the reaction is more intense,and the combustion duration is shortened to 47.3ms.Finally,the Al/GO film loaded nano aluminum and copper oxide particles（Al/Cu O/GO）nanocomposite energetic materials were prepared by direct coating method,and the ignition and combustion patterns of the energetic system were studied.The results show that nano thermite Al/Cu O can promote the combustion of the whole material system,and the combustion of Al/Cu O/GO composite energetic film is more severe than that of Al/GO composite film under the same flash ignition conditions. |
