激光烧蚀下不同颗粒度Al-teflon的反应行为

为研究不同颗粒度对Al-teflon反应行为的影响,以颗粒度25μm、1μm和20～200 nm的Al粉和微米级Teflon粉混合制备的反应材料为研究对象,基于脉冲激光烧蚀实验,结合ICCD相机和光谱仪对反应过程中的自发光成像和发射光谱进行瞬态观测。研究结果表明,Al-teflon反应材料在激光烧蚀下的反应行为体现出典型的二次反应特征,具有持续燃烧特征和明显的后燃效应,也具有较长的能量释放时间;同时,其反应行为与Al粉颗粒度密切相关:初始阶段,反应随Al粉颗粒度的降低加剧,随着反应的进行,纳米级Al粉对应的反应材料后续反应能力逐渐下降,反应强度和反应时间都小于1μm铝粉对应的反应材料。

Reaction properties of Al-teflon with different particle sizes under laser ablation

In order to study reaction properties of Al-teflon with different particle sizes, we prepared Al-teflon reactive material powders by mixing Al powder with particle sizes of 25 μm, 1 μm, and 20-200 nm, where micron-sized teflon powder as raw materials. The laser ablation experiments of Al-teflon reactive material were performed by a pulsed laser system. The self-luminescence imaging and emission spectra in the reaction process were collected and analyzed by ICCD camera and spectrometer. The results show that the reaction properties of Al-teflon reactive material under laser ablation reflect the characteristics of typical secondary reactions, together with continuous combustion characteristics and obvious afterburning effects, and the total energy release time is long. At the same time, the reaction properties is closely related to the particle size of Al powder. As the particle size of Al powder decreases, the reaction becomes more violently in the initial reaction stage. As the reaction progresses, the subsequent reaction capability of the corresponding reactive material with nano-Al size powder gradually decreases, the reaction intensity and reaction time are not as good as the corresponding reaction materials of 1 μm size aluminum powder.