RDX/aluminum composites were prepared by the spray-drying method with F2602 as a binder. The morphology and covering effect of composites were characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The effect of the processing parameters on the morphology of the samples was investigated. The impact sensitivity and thermal decomposition behavior of RDX/aluminum composites were also measured and analyzed. Optimal morphology of samples was achieved when the inlet temperature, nitrogen flow rate, and suspension feed flow rates were 80°C, 473 L·h-1, and 4.5 mL·min-1, respectively. In addition, RDX/aluminum composites with the same content were prepared by a coverage-mixing method for comparative analysis. Experimental results showed that the thermal sensitivity and the impact sensitivity of RDX/aluminum composites prepared by the spray-drying method were significantly lower than those of RDX/aluminum composites prepared by the coverage-mixing method.
A cook‐off resistant high‐energy booster explosive based on hexanitrohexaazaisowurtzitane (CL‐20) and 1,1‐diamino‐2,2‐dinitroethylene (FOX‐7) was prepared by the solvent‐slurry process with ethylene‐vinyl acetate copolymer (EVA) and acrylate rubber (ACM) as binders. Small‐scale cook‐off test was used to select formulations that have cook‐off resistant ability and their performance were further compared. Scanning electron microscopy (SEM) was utilized to characterize the morphology and particle size of CL‐20, FOX‐7 and molding powders. The mechanical sensitivity, thermal decomposition performance, and detonation velocity of the CL‐20/FOX‐7 boosters were also measured and analyzed. The results showed that the mechanical sensitivity of CL‐20/FOX‐7 boosters was significantly lower than those of CL‐20 based PBX without FOX‐7. The maximum measured detonation velocity of the booster is 8576 m ⋅ s−1. These combined properties indicate that CL‐20/FOX‐7 booster can be used as an insensitive booster.
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.
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