The preparation and properties of AP-based nano-limit growth energetic materials

AP-based nano-limit growth energetic materials(NLGEM) were prepared by using SiO₂ gel as nano-limit growth skeleton materials and using sol-gel method combining solution crystallization to make AP recrystallized in the nanopores of SiO₂ gel skeleton to form AP/SiO₂ NLGEM. The chemical and physical structure and properties of AP/SiO₂ NLGEM were studied in detail. AP with nanoscale particles size range from 69nm to108nm was recrystallized in the pore of SiO₂ gel skeleton and the particle size of AP increased with the amount of AP in NLGEM increasing. Moreover, the preparation method didn't change the crystal form of AP and bring impurities to NLGEM. The decomposition of AP/SiO₂ NLGEM was a one-step process, which was indicated its decomposition was more concentrate than pure AP and AP/SiO₂ simple physical mixture (AP/SiO₂ SPM), whose decomposition was a two-step process. At the time, the decomposition heat of AP/SiO₂ NLGEM was higher than that of pure AP and AP/SiO₂ SPM. The sensitivity of AP/SiO₂ NLGEM was lower than those of the pure energetic components and physical mixtures according to the impact sensitivity test.