动态真空安定性试验(DVST)方法研究(Ⅱ):RDX的热分解

Dynamic Vacuum Stability Test(DVST) Method(Ⅱ):Thermal Decomposition of RDX

运用动态真空安定性试验(Dynamic Vacuum Stability Test,DVST)方法研究了RDX的热分解过程,对测试数据拟合求解得出RDX在非等温阶段的分解机理函数为Avrami-Erofeev方程(n=4),表观活化能为174.10kJ.mol-1,lnA为34.45;等温阶段的分解机理函数为Anti-Jander方程模型,即G(α)=(1-2/3α)-(1-α)2/3,反应速率常数k=1.63×10-5s-1。分解气相产物在标准状态下为0.10mL.g-1。实验不仅得到了与真空安定性试验(VST)方法相吻合的分解最终结果,还得到了合理有效的动力学参数,证明了DVST方法的科学性和可靠性。实验实时跟踪了RDX的分解过程,得到了分解过程中各物理量的变化信息,为RDX的安全储存、可靠使用提供更为有效的数据。

Dynamic Vacuum Stability Test（DVST） method was used to study the thermal decomposition process of RDX.Through fitting the data obtained from DVST,the decomposition reaction of RDX in the non-isothermal stage follows the Avrami-Erofeyev equation under the test conditions.The activation energy Ea is 174.10 kJ·mol-1,and lnA is 34.45.The decomposition reaction of RDX in the isothermal stage follows the Anti-Jander equation,and the constant of reaction rate is 1.63×10-5s-1.The final amount of evolving gases of the decomposition is 0.10 mL·g-1.The results indicate that the DVST can record and describe the whole process of the decomposition with the parameters of pressure and temperature of sample.The terminal results of DVST method is similar to that with VST,and logical kinetics parameters were obtained through the DVST method.These data can be used for characterizing thermal stability,compatibility,and storage life and decomposition mechanisms of RDX.