Abstract
In order to improve the detonation performance of hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) explosive, addictives with high heat values were used, and magnesium hydride (MgH2) is one of the candidates. However, it is important to see whether MgH2is a safe addictive. In this paper, the thermal and kinetic properties of RDX and mixture of RDX/MgH2were investigated by differential scanning calorimeter (DSC) and accelerating rate calorimeter (ARC), respectively. The apparent activation energy (E) and frequency factor (A) of thermal explosion were calculated based on the data of DSC experiments using the Kissinger and Ozawa approaches. The results show that the addition of MgH2decreases bothEandAof RDX, which means that the mixture of RDX/MgH2has a lower thermal stability than RDX, and the calculation results obtained from the ARC experiments data support this too. Besides, the most probable mechanism functions about the decomposition of RDX and RDX/MgH2were given in this paper which confirmed the change of the decomposition mechanism.
Highlights
Metal hydrides belong to the hydrogen storage material, which have been widely applied for energy storage carriers in recent years
In middle of 1960s, the former Soviet Union conducted the research on the application of metal hydrides for energetic materials
From the above-mentioned researches, it can be found that metal hydrides have great potential as additive components for energetic materials
Summary
Metal hydrides belong to the hydrogen storage material, which have been widely applied for energy storage carriers in recent years. Selezenev et al [4] considered the influence of aluminum, magnesium and their hydride powders on the detonation characteristics of the compositions based on ammonium nitrate, hexahydro1,3,5-trinitro-1,3,5-triazine (RDX), and cyclotetramethylenetetranitramine (HMX). It concluded that the detonation velocity in the compositions with hydride powders were higher than in the composition with metal powders. MgH2 was applied as a pyrotechnic composition which provides improved ignition rates and increased burning time without reduction in luminous intensity [5]. From the above-mentioned researches, it can be found that metal hydrides have great potential as additive components for energetic materials. The hazard characterizations of the mixtures were analyzed in order to ensure the safe application of MgH2 in RDX
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