多尺度界面可调型 Al-RDX 含能复合物的制备及其热分解特性

Based on the integrated design concept of oxidant/metal fuel (Al) in propellants and the surface modification of aluminum particles, the multi-scale interface-tunable semi-embedded Al/RDX and fully-embedded Al@RDX composites were prepared by resonant acoustic mixing and spray drying. The morphology, true density and heat of combustion of the composites were characterized by scanning electron microscopy (SEM) and other techniques, and the thermal decomposition process and its gas products were studied by simultaneous thermal analyzer (DSC-TG-FT-IR). The results showed that compared with the mechanical mixture, the true density of the composites remained basically unchanged, but the heat of combustion of these two composites was higher, which were 17.31 kJ/g and 18.82 kJ/g. The DSC results showed that the heat of thermal decomposition of RDX can be increased by these two ways. Although the embedding of aluminum particles does not change the types of gas-phase products of RDX decomposition, it is more conducive to generate more HCHO. After the embedding of aluminum particles, the first decomposition stage of RDX changed from the random nucleation model (A2) to the random chain scission model (L2), while the second decomposition stage of the fully-embedded Al@RDX composites was transformed into the autocatalytic model (AC).