Microreactor Preparation of RDX/FOX‐7 Composite Explosives With Better Safety Performance and Performance Characterization

ABSTRACT Modifying the microforms of energetic materials can greatly improve their safety performance and energy release efficiency. This study spherical RDX/FOX‐7 composite crystals with high energy density and low sensitivity were created using an independently constructed modular microreaction system combined with solvent‐nonsolvent and crystallization technology. The effects of four distinct solution concentrations on the morphology and particle size distribution of RDX/FOX‐7 composite crystals were investigated, and the formation mechanism of the composite crystals was analyzed. Meanwhile, the crystal structure, molecular structure, and thermal properties of RDX/FOX‐7 composite crystals were characterized, and the mechanical sensitivity and combustion performance of the composite samples at the optimal concentration were tested. The results show that when the solution concentration is 0.35 g/mL, spherical‐like composite crystals with an average particle size of 1.83 µm and uniform particle size distribution can be obtained. The thermal performance analysis indicates that the average activation energy of thermal decomposition of the composite crystals at this concentration has increased to 232.31 kJ⋅mol −1 , which is 48.84 kJ⋅mol −1 higher than that of the raw RDX. The mechanical sensitivity test shows that the composite crystals' impact force and friction load are 17.5 J and 288 N, respectively, 94% and 125% higher than raw RDX. Meanwhile, the combustion performance test confirmed that the RDX/FOX‐7 composite crystals can release energy efficiently during combustion and have better stability. Its overall performance is better than that of the raw materials. This study provides important theoretical support for designing and preparing new energetic materials.