Gas generation behavior of thermal decomposition and combustion of ammonium dinitramide

摘要

Energetic materials are now evaluated not only with regard to their performance but also their current or potential environmental and health impacts. Hydrazine is widely used as a liquid propellant for the attitude control of rockets and space satellites, however, it is highly toxic and the handling of hydrazine is difficult and costly. Ammonium dinitramide (ADN) is one of the promising high energetic materials replacing hydrazine due to its high energy content and low toxicity [1,2]. We have studied about thermal decomposition behavior of ADN using various method [3-5]. In this study, to get better understanding of thermal decomposition and combustion mechanism of ADN, evolved gas analyzes were carried out. Thermal decomposition in condensed phase was investigated using simultaneous analysis of thermal behavior and evolved gas. The reaction proceeds via multiple stages and the main reaction was N_2O-generating reaction. The combustion behavior and evolved gas under various pressures were analyzed. Under low pressure, it is thought that the main reaction at low pressure was thermal decomposition since there was no frame and composition of evolved gas was similar as that from thermal decomposition in condensed phase. On the other hands, the frame was observed and the amount of N_2O in evolved gas was low. These results indicates that some of the gas evolved from condensed phase decomposition further reacted in the frame.