Effect of different proportions of Mg(BH4)2/Al on thermal decomposition of RDX

In order to study the effect of aluminum powder and Mg(BH4)(2) on the thermal safety of energetic materials, the mixtures that RDX mixed with different proportions of Al/Mg(BH4)(2) were produced by using the molding powder method. The thermal decomposition curves of mixed explosives were obtained by differential scanning calorimetry (DSC) and adiabatic accelerated calorimetry (ARC), the kinetic parameters were calculated, and the risk of the thermal runaway was evaluated. The following main conclusions were drawn. Under the premise of a certain RDX quality, the decomposition heat of adding the same mass of Al is 1.15 times that of adding the same mass of Mg(BH4)(2). Adding Mg(BH4)(2) alone will reduce the thermal stability of RDX, while adding Al/Mg(BH4)(2) mixture will improve the thermal stability of RDX. The mass ratio of Al/Mg(BH4)(2) is less than 2:1, which can improve the performance of mixed explosives to a certain extent, and the mixed explosive as a whole achieve better thermal safety. This study provides important information for improving the safety of storage, transportation, and use of RDX-based mixed explosives.

Automated summary

By studying the thermal decomposition curves and kinetic parameters of mixed explosives, it was found that adding aluminum powder/Mg(BH4)2 mixture below a 2:1 mass ratio can improve the thermal stability of the explosive, thus enhancing its thermal safety.