Thermoanalytical Investigation on Pyrotechnic Mixtures Containing Mg-Al Alloy Powder and Barium Nitrate

Abstract

Abstract The thermal kinetics properties of pyrotechnic compositions consist of Ba(NO3)2+MgAl, Ba(NO3)2+MgAl+S, Ba(NO3)2+MgAl+KClO4 mixtures were investigated in this paper. Differential scanning calorimeter (DSC) had been employed to illustrate the reaction process of these pyrotechnic compositions. The apparent activation energy ( E ), frequency factor ( A ) and the critical ignition temperature of thermalexplosion were calculated by Kissinger approach, Ozawa approach and Satava-Setsak approach. The results show that adding of S and KClO4 both increase the value of E and A slightly. The critical ignition temperature of thermal explosion rises by adding of S or some KClO4. But with the increasing of KClO4 content, the critical ignition temperature of thermal explosion drops. Besides, the mixture consist of Ba(NO3)2+MgAl+S is considered unlikely to propagate detonation or deflagration, and the possibility of detonation or deflagration propagation is reduced to a certain degree when adding of KClO4 in Ba (NO3)2+MgAl mixture.