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Abstract
The influences of combinative effect of temperature and humidity on the thermal stabilities of three pyrotechnic compositions are investigated in the study. The thermal behavior for each pyrotechnic is analyzed by SETARAM thermal analyzer. Activation energy is determined by Kissinger method and critical temperature of thermal explosion (Tb) of pyrotechnic compositions is also calculated. The results of thermal analysis revealed that relative humidity could decrease the thermal stability of pyrotechnic mixtures. The critical temperature of thermal explosion (Tb) of each pyrotechnics decreased as the relative humidity increasing. Based on the value of Tb, the thermal stabilities of the pyrotechnic mixtures are in the order of Sr(NO3)2/Mg4Al3/PVC/PF > Sr(NO3)2/SrCO3/KClO4/Mg4Al3/PVC/PF > Sr(NO3)2/KClO4/Mg4Al3/PVC/PF. The thermal stability of Sr(NO3)2/Mg4Al3/PVC/PF show the best thermal stability than other two mixtures whether it is in the condition of humidity or not.
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