The Ignition and Combustion Performance of Nanothermite Al/Bi2O3 with Energetic Perovskite DAP‐4 as High‐Energy Additives

Abstract Aluminium/bismuth trioxide (Al/Bi 2 O 3 ), as a class of important and interesting nanothermite, had received much attention in the field of energetic materials. However, enhancing the ignition and combustion performance of Al/Bi 2 O 3 is still a great challenge. In this work, energetic perovskite DAP‐4 was used to design and fabricate the ternary composites Al/Bi 2 O 3 /DAP‐4 with the different contents of DAP‐4 additives. The micromorphology and structure of composites Al/Bi 2 O 3 /DAP‐4 were characterized by scanning electron microscope (SEM) and X‐ray diffraction (XRD). The ignition and combustion performances of composites Al/Bi 2 O 3 /DAP‐4 were studied by electric heating ignition apparatus. The results showed that energetic perovskite DAP‐4 was introduced to reduce the ignition energy of Al/Bi 2 O 3 and promote the combustion reaction of Al metal particles. With 10wt% DAP‐4 added, Al/Bi 2 O 3 /DAP‐4 sample showed a more durable combustion process for ∼270 ms. And with the contents of DAP‐4 increased, the combustion time shortened and the burning intensity had improved. The intensity of flame combustion reaches the maximum when 30wt% DAP‐4 is added. The main thermal decomposition gas products of Al/Bi 2 O 3 /DAP‐4 composite are CO 2 , HCl, H 2 O, and so on. A synergistic catalysis ignition and combustion reaction mechanism of Al/Bi 2 O 3 with DAP‐4 as additives was proposed. DAP‐4 ignited by lower ignition energy could trigger nanothermite Al/Bi 2 O 3 . Bi 2 O 3 particles can reduce the thermal decomposition temperature of DAP‐4, which accelerated the combustion reaction of nanothermite Al/Bi 2 O 3 with DAP‐4 as additives. This work offered a new idea for design and application of nanothermite with high‐performance catalysis additives.