爆炸冲击下氟壳铝释能特性试验研究

To study the ignition and energy release characteristics of this material under explosive shock, relevant experiments were conducted. First, based on TG-DSC experiments, the Fluorine Shell Aluminum was slowly heated in air, revealing that the main exothermic process occurs when the fluoropolymer shell breaks down and the active nano-aluminum reacts with oxygen in the air. Laser ignition test results and literature analysis showed that at normal temperature and pressure, the ignition delay of Fluorine Shell Aluminum is 60.49% of that of Al/PTFE, and its burning rate is 289.71% of Al/PTFE. Then, Al/PTFE and Fluorine Shell Aluminum were pressed into reactive material pellets, and explosive shock ignition tests were conducted using a detonator and JHL-2 explosives on both materials. The tests reveal that under detonator-induced shock, Fluorine Shell Aluminum had a better self-sustaining reaction capability than Al/PTFE, with a reaction rate 1.38 times that of Al/PTFE. Under explosive shock, both Fluorine Shell Aluminum and Al/PTFE increased the fireball area by 28.17% and 31.62%, respectively. The time to reach the maximum fireball area for Fluorine Shell Aluminum was 31.21% faster than for Al/PTFE. Additionally, when JHL-2 initiated Fluorine Shell Aluminum compared to detonator-initiated JHL-2, the free-field overpressure impulse at 2 m, 3 m, and 4 m from the explosion center increased, with the maximum increase being 124.6%. The rate of decline in free-field overpressure impulse slowed with the propagation distance of the shockwave, with the maximum attenuation rate reduced by 12.18%. Finally, the overall reaction process of Fluorine Shell Aluminum under explosive shock was summarized in three stages: a partial reaction occurs during the initial detonation phase; the unreacted Fluorine Shell Aluminum fragments into dispersed particles; and these particles exit the explosion’s vacuum zone, come into contact with air, ignite, and proceed to complete deflagration. The energy release from Fluorine Shell Aluminum is predominantly concentrated in the third stage. The energy-enhancing effects of Fluorine Shell Aluminum under explosive shock are mainly reflected in the increased thermal damage capability of the explosion and the enhanced shockwave impulse, as well as the delayed attenuation of the shockwave.