The thermal decomposition characteristic parameters of octogen( HMX) were obtained by differential scanning calorime-try( DSC). Onset decomposition temperature( To ), mass loss in stages( △ m% ), the maximum mass loss speed and corresponding temperature, final residual quantity, reaction depth, reaction rate and so on were obtained by thermogravimetry( TG). Thermal analysis data and Malek method were applied for the thermal decomposition research of HMX. The results show that HMX presents an endothermic peak at which β-HMX becomes to 5-HMX and an endothermic peak for melting in the first thermal process. Further, HMX presents a fierce exothermic peak and it's a complete thermal decomposition process. The most probable mechanism function, critical temperature of thermal explosion and self-accelerating decomposition temperature were f(α) = (1 -α)2, rb =279.9 ℃ and TSA0T =273.3 ℃, respectively.%利用差示扫描量热法( DSC),获得了单质炸药奥克托今(HMX)热分解的特征参数,利用热重法(TG)得到HMX热分解的起始分解温度、各阶段的失重量、最大失重速率及对应的温度、最终残渣量、反应深度、反应速率等参数.将DSC、TG数据与Malek法相结合对HMX的热安全性进行了研究.结果表明,HMX在加热过程中先出现晶型转变吸热峰和一个熔融吸热峰,继续加热,出现一个剧烈的分解放热峰,且分解完全.HMX的最可几机理函数,热爆炸临界温度和自加速分解温度分别为f(α)=(1-α)2,Tb =279.9℃和TSADT= 273.3℃.
展开▼
