Abstract
To achieve a uniform distribution of the components and a better performance of aluminized composite explosives, Viton (dipolymers of hexafluoropropylene and vinylidene fluoride) @ FOX-7 (1,1-diamino-2,2-dinitroethylene) @Al microspheres and FOX-7/Viton@Al were synthesized by spray-drying strategy contrastively. Viton@FOX-7@Al owned porous and loose morphology and good sphericity with a retained crystal phase of FOX-7 and aluminum. The 23.56% fluorine content on Viton@FOX-7@Al surface indicated that Viton was completely coated on the surface of the particles. Nanosized aluminum (nAl) in Viton@FOX-7@Al had a certain catalytic activity on the thermal decomposition process of FOX-7 resulting in a depressed exothermic peak temperature and reduced apparent activation energy relative to nAl in FOX-7/Viton@Al. Because of the specific structure and the synergies between each individual component, Viton@FOX-7@Al showed reduced impact sensitivity and friction sensitivity than those of FOX-7/Viton@Al. In brief, Viton@FOX-7@Al with multilevel coating structure possessed comparatively low thermal decomposition energy requirement and improved safety performance.
Highlights
IntroductionPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
Aluminum powder is used as a fuel additive to increase the energy of the air blast wave, the bubble energy in underwater explosions, and the duration of combustion action in aluminized composite explosives [4,5,6]
FOX-7/Viton@Al and Viton@FOX-7@Al with different structures were successfully synthesized by the spray-drying method
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Aluminized composite explosives are usually composed of heterogeneous components, including explosive crystals as high-energy components, polymers as binders and aluminum powder as the main metal fuel. Due to the high energy output and explosion heat, aluminized composite explosives are widely used in advanced weapon systems. Aluminum powder is used as a fuel additive to increase the energy of the air blast wave, the bubble energy in underwater explosions, and the duration of combustion action in aluminized composite explosives [4,5,6]. Compared to micrometer-sized particles, nano-sized aluminum (nAl) particles own high special surface areas and enhanced contact areas with explosives, so as to achieve more complete and faster oxidation [4,7]
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