Preparation And Study On Properties Of Nanometer HMX/RDX Based Plastic Bonded Explosives (PBXs)

As the main high explosives, HMX and RDX are widely used in the pressure packed PBX explosive. However, ordinary industrial-grade HMX and RDX have higher sensitivity, the PBXs composed of them are difficult to meet the development requirements of the high-energetic and insensitive ammunition. An amount of studies showed that after nanoparticalization, HMX and RDX’s impact and shock sensitivity-reduced obviously and they have a high detonation performance. This paper investigates the nanometer HMX/RDX as the main body of the PBX molding powder mixed explosives. On the premise of not reducing energy, I obtained two new low sensitivity mixed explosives, providing a new method for the development of the high energetic and insensitive ammunition. The main contents were as follows.Firstly, The nanometer HMX-based PBX was prepared using nanometer HMX as the body explosive and the solution-water slurry-distillation technique based on the JO-8 system.Through to the determination of particle size and particle size distribution, the optimum technological parameter were obtained as following:the ratio of water to material being 1:4, the stirring speed bing 600rpm/min, the reaction temperature being 80℃, the binder drop speed being 5mL/min and the concentration be ing 5%g/mL. The molding powder are uniform size, smooth surface and spherical particles. Component content analysis is performed by a solvent extraction method.Secondly,The nanometer RDX-based PBX was prepared using nanometer RDX as the body explosive and the solution-water slurry-distillation technique based on the JH-2 system.Through to the determination of particle size and particle size distribution, the optimum technological parameter were obtained as following:the ratio of water to material being 1:4, the stirring speed being 600rpm/min, the reaction temperature being 75℃, the binder drop speed being 5mL/min and the concentration being 5%g/mL. The molding powder are uniform size, smooth surface and spherical particles. Component content analysis is performed by a solvent extraction method.Thirdly, the study covers thermal decomposition characteristics, impact and shock sensitivity and compressive strength of nanometer HMX based PBX molding powder. Compared with micrometer HMX based PBX molding powder, the result shows that the activation energy of nanometer HMX based PBX molding powder increased 86.9kJ/mol, the impact and shock sensitivity decreased by 16.8%,24.4%, respectively. The compressive strength of nanometer HMX based PBX molding powder is 2.71 times lager than those of micrometer HMX based molding powder.Lastly, the study covers thermal decomposition characteristics, impact and shock sensitivity and compressive strength of nanometer RDX based PBX molding powder. Compared with micrometer RDX based PBX molding powder, the result shows that the activation energy of nanometer RDX based PBX molding powder increased 9.3kJ/mol, the impact and shock sensitivity decreased by 31.0%,14.6%, respectively. The compressive strength of nanometer HMX based PBX molding powder is increased by 89.42% than those of micrometer HMX based molding powder.