Investigation on Oxygen-Equilibrium Effects of Laser Ignition of Energetic Materials

Abstract

An investigation on oxygen-equilibrium of laser ignition of energetic materials was carried out through experiments. The threshold energy of laser ignition of several systems such as Zr/KClO 4, Ti/KClO 4, and Mg/KClO 4 were measured with different system composition. The results show that the mass ratio of initial mixture powders has a significant effect on the threshold energy of ignition. The threshold energy presents a minimum with increasing mass ratio, which corresponds to an oxygen-rich system composition. That is, an oxygen-rich composition is favorable to laser ignition. The ignition requires lower threshold, or energetic materials have relatively higher laser sensitivity. Also the findings were theoretically analyzed.

Near-Infrared Light Triggered a High Temperature Utilizing Donor–Acceptor Cocrystals

“…Photoinduced heat emission has been widely used in many fields such as in the chemical industry as well as for applications in water treatment, as an energy resource, for photothermal therapy, in the mining industry, for imaging, and in some military equipment. − The photothermal effect can be used as an initiator in photothermal polymerization, photothermal expansion, photothermal desorption, photoisomerization, and phototriggered shape memory effect . Meanwhile, laser initiators have the advantages of remote and untethered control, but most currently used light-driven initiators have either relatively low energy conversion efficiency or complicated and expensive preparation technology.…”

“…Laser initiations have been investigated for decades. Oxidizing inorganic metal salts (OIMS), physical mixtures of reductant/OIMS, such as Ti/KClO 4 and B/KNO 3 , , are suitable for laser ignitors but exhibited very limited photon initiation capacity and poor photoresponsive ability in the NIR range. Traditional organic initiators such as 2-methyl-1,3,5-trinitrobenzene (also known as trinitrotoluene, C 7 H 5 N 3 O 6 , or TNT), cellulose nitrate, 1,3,5-trinitroperhydro-1,3,5-triazine (C 3 H 6 N 6 O 6 or RDX), pentaerythritol tetranitrate (C 5 H 8 N 4 O 12 or PETN), 1,3,5,7-tetranitro-1,3,5,7-tetrazocane (C 4 H 8 N 8 O 8 or HMX), etc .…”

Photo-responsive behaviors and structural evolution of carbon-nanotube-supported energetic materials under a photoflash

“…The present power density of the flash is around 1-5 W/cm 2 , one magnitude lower than that of laser. It is known that the composites of metals and oxidants have a remarkable photo-responsive behavior under high-power lasers or light-emitting diodes [12,13]. However, the composite showed no photo-response to a photoflash.…”