RDX-AP体系热分解研究及相容性初探

Preliminary Studies on the Thermal Decomposition and the Compatibility of RDX-AP Mixtures

采用差热分析(DTA)法研究了RDX中加入AP后形成RDX-AP混合体系的热分解特性,求算出该体系的热分解动力学参数,并对其相容性进行了初步探讨。结果表明:在RDX中加入AP后体系的分解活化能增大,体系的安定性提高。当AP含量在8%以上,可以使体系的分解峰顶温度较RDX降低约30C;通过比较RDX-AP体系在不同温度下的分解速率常数可知,在高温时AP使RDX分解速率常数增大,而常温下分解速率常数减小。提出分解速率常数可以作为此类以分解为特征的烟火药剂相容性快速评估的依据。

The thermal decomposition characteristics of RDX-AP mixtures were studied by differential thermal analysis (DTA). The kinetic parameters of thermal decomposition were calculated with Kissinger method, and the compatibility of the mixtures was discussed. The experimental results showed that the activation energy of the decomposition reaction of RDX-AP mixture increased as AP was added into RDX. This means an increase in the thermal stability of the mixtures. The summit temperature of decomposition peak of RDX was lowered about 30C when the content of AP was equal to or greater than 8%. Compared with the decomposition rate constants of RDX at different temperature, it showed that AP made the decomposition rate of RDX-AP mixture increase obviously at high temperature, and lower the value at normal temperature. The decomposition rate constants of pyrotechnic agents with characteristics of decomposition can be taken as criteria for evaluating the compatibility rapidly.