Study On The Safety Performances Of Thermobaric Explosive

To improve safety performances of TBXs,2,6-diamino-3,5-dinitropyridine-l-oxide (ANPyO) and 2,6-diamino-3,5-dinitropyrazine-l-oxide(LLM-105) as novel insensitive high explosives were chosen in this paper. And the cocrystal of components was also studied to reduce the sensitivity. The safety performances of TBXs were discussed by experimental tests and theoretical analysis. We anticipate the research described herein can contribute to the further development of TBXs.(1) The thermal decomposition characteristics of single and binary system were tested by DSC. Besides, the non-isothermal kinetic parameters such as the apparent activation energy (Ea) and pre-exponential factor (A) were calculated by Kissinger’s and Ozawa-Doyle’s methods. The results showed that ANPyO and LLM-105 had good thermal stability and exerted great effects on thermal safety of composite explosives.(2) The compatibility of energetic materials was studied by vacuum stability (VST) and DSC methods. It was showed that components had good compatibility except the binary system of ANPyO/HMX, which was slightly sensitive.(3) The mechanical sensitivity as well as formability of thermobaric explosives were studied and compared in details. The results indicated the TBXs respectively adopted 1.0 wt% ANPyO and LLM-105 had the better mechanical sensitivity. The safety of TBXs was improved with the increasing content of insensitive high explosive. The series formulations of ANPyO had the poor formability, which had been optimized through binder system. The formulations of LLM-105 had good formability.(4) In order to investigate the effects of process methods, the mechanical mixing and solvent/nonsolvent(S/NS) methods were designed. The results showed that the appearance of cocrystal of CL-20/ANPyO had been greatly improved. XRD patterns showed cocrystal of CL-20/ANPyO produced the new diffraction peak and the thermal decomposition performance also changed to a certain extent. Compared to mechanical mixing method, cocrystallization can reduce sensitivity more effectively. The formula containing a certain amount of cocrystal also had great safety.