Al粒径对富铝聚四氟乙烯基铝活性材料冲击反应性能的影响

The effect of Al particle size on the shock-induced reaction characteristics of PTFE/Al reactive material with a mass ratio of 50:50 is investigated. 4 kinds of PTFE/Al reactive material specimens with different Al particle sizes were prepared by molding and sintering. The reactive material specimens were tested by using split-Hopkinson pressure bar (SHPB), and the shock-induced reaction processes of PTFE/Al reactive material at different strain rates were recorded with a high-speed camera. The results show that, as the Al particle size increases from 50 nm to 10 μm, the reaction delay rises up to 40% and the reaction duration decreases up to 17%, while the amount of reactive material participating in the reaction decreases, and the reaction intensity and energy release decrease. When the Al particle size increases to 70 μm, it is difficult to ignite under SHPB loading. The strain rate also greatly influences the reactive characteristics of reactive material, and the reaction delay of PTFE/Al reactive material decreases with the increase in the loading strain rate. The results show that Al particle size greatly influences the impact reaction diffusion, reaction speed, and extent of reaction of PTFE/Al reactive material, and its impact reaction property can be adjusted by adjusting Al particle size.