Combustion performance of nano Si powder with molecular perovskite energetic materials DAP-4 as oxidant.

Nano Silicon (Si) powder has become a new type of solid fuel in recent years because of its high energy density, large gas production, and low agglomeration behavior. Optimizing and improving its energy release performance is an important challenge. In this paper, DAP-4, an energetic molecular perovskite material with high energy and strong oxidation, was introduced as the oxidant to prepare DAP-4/Si composites, and its combustion properties were studied. The thermal decomposition, combustion performance, as well as their combustion product properties, were studied. The results showed the thermal decomposition properties of DAP-4/Si composites still keep stable (>370 °C), and the combustion properties of DAP-4/Si composites first increase with Si content and then reduced. It was confirmed that DAP-4/Si with the ratio of 6.5:3.5–6:4 had a better burning intensity than the other ratios. The combustion mechanism of DAP-4/Si composites was proposed based on the ignition and combustion characteristics of DAP-4/Si composites. This work may provide a further reference for the application of DAP-4 into solid propellant formulation. • (H 2 dabco)[NH 4 (ClO 4) 3 ] DAP-4/Si composites were prepared and characterized. • The combustion properties of DAP-4/Si composites were researched. • DAP-4/Si with the ratio of 6.5:3.5–6:4 had a better burning intensity than the other ratios. • The combustion mechanism of DAP-4/Si composites was proposed. [ABSTRACT FROM AUTHOR]