The Influence of AP Addition on the Combustion Characteristics of TKX-50 with Concentrated Ignition

In order to study the influence of ammonium perchlorate (AP) addition on the combustion reaction process of dihydroxylammonium 5,5’-bistetrazole-1,1’- diolate (TKX-50), a concentrated ignition system was used to evaluate the ignition and combustion characteristics of the samples. The self-luminescence characteristics and the OH concentration distribution in the flame of TKX-50 and TKX-50/AP composites were captured by a high-speed camera and a planar laser induced fluorescence system (PLIF), respectively. The combustion products were then analyzed by a scanning electron microscope (SEM) and a X-ray energy dispersive spectrometer (EDS). The results show that the reaction of TKX-50 undergoes three stages with concentrated ignition, and a bright yellow color appears in the flame due to the formation of NH₂α during the combustion process. When the materials of AP is added, there are pre-ignition occurred for twice. The ignition delay time increases, and the reaction in the pyrolysis phase is more intense. Besides, the burning rate is faster and the flame brightness is significantly weakened due to the decrease of NH₂α. During the combustion process, the high-concentration OH signal of the two samples distribute on the two wings of the flames, and the peak signals are similar under the 10 Hz laser excitation. For the samples before and after the combustion reaction, the morphology is quite different, and the specific residue composition needs be further analyzed.