DAP-4@Al核壳结构制备及性能研究OA

In order to improve the issue of particles agglomeration of metal fuels within solid propellants,a core-shell structure is employed to create a micro-and nano-scale composite of oxidizer and fuel.DAP-4@Al core-shell composite materials were prepared using DAP-4 as the core oxidizer,EVA binder as the modifier,and nano-sized Al powder as the outer fuel.The effects of nano-Al content on the coating efficiency,thermal decomposition,and combustion performance of DAP-4@Al were investigated.The condensed combustion products were also collected for characterization.The results showed that when the mass fraction of nano-Al reached 20％,DAP-4 was completely encapsulated,forming a uniform and well-defined core-shell structure.Nano-Al powder exhibited a certain catalytic effect on the thermal decomposition reaction of DAP-4.The ignition and combustion tests demonstrated that the incorporation of nano-Al significantly enhanced the heat release and combustion in-tensity of DAP-4.When the mass fraction of nano-Al was 20％,the maximum flame temperature notably increased to 1 563 ℃.Additionally,the presence of Al particles effectively modulated the burning rate of DAP-4,indicating that the DAP-4@Al core-shell composite exhibits higher energy characteristics and better combustion performance,and enhances the disper-sion of fuel throughout the composite system and improves the combustion efficiency.