SHAN Congming;LIU Jie;ZHU Shunguan;ZHANG Lin
Thermal behaviors of red phosphorus (RP) and its mixtures with oxidants, such as KNO3, Ba(NO3)2, MnO2, Fe2O3, and KMnO4, were studied experimentally using differential thermal analysis (DTA) and thermogravimetry (TG) methods in air atmosphere. Oxidation temperature of RP and decomposition temperatures of oxidants mentioned above were obtained. For the KNO3+RP+Teflon, Ba(NO3)2+RP+Teflon, MnO2+RP+Teflon, Fe2O3+RP+Teflon, and KMnO4+RP+Teflon pyrotechnic systems, chemical reaction happen within the range of 399.5-469.8 ℃, 445.7-471.6 ℃, 409.8-479.3 ℃, 419.8-466.5 ℃ and 396.2-467.4 ℃, respectively. Self-accelerating decomposition temperature (Te0), critical ignition temperature (Tb), apparent activation energy (E),△S#, △H#, and △G# of the pyrotechnic mixtures were measured according to DTA-TG experiments. Furthermore, friction sensitivity and property of hygroscopicity of pyrotechnic mixtures were examined. Based on these data, appropriate oxidants in red phosphorus smoke agent,which are Ba(NO3)2, MnO2 and Fe2O3,can be selected.