Experimental Researches on Thermal Decomposition of Explosive Charge Used in Certain Warhead

摘要

By experimental method of accelerated aging, mass loss of explosive samples used in certain warhead was measured respectively under four different levels of storage temperature and corresponding thermal decomposition mechanism was analyzed. With the experimental data, thermal decomposition activation energy (Ea) and pre-exponentlal factor (A) were calculated based on Arrhenius rate equation to provide reference for safe use and life evaluation of the explosive charge. The results showed that thermal stability of the explosive charge was poor. 123 resin contained in the charge experienced rapid decomposition when heated at all f6ur levels of temperature, which contributed to main weight loss of the samples in initial accelerated decomposition stage and further resulted in accelerated decomposition of RDX. In delay decomposition stage, thermal decomposition process had typical characteristics of zero-order reactions, so with experimental data Ea and A were calculated based on Arrhenios model. The calculated value of Ea was 93.43 KJ/mol, which was much less than one of pure RDX, this could further prove that rapid thermal decomposition of 123 resin in the samples could bring catalytic effect on thermal decomposition of RDX.