Here we present analysis of a novel reactive material system that employs dinitrogen tetroxide (N₂O₄) as a liquid oxidizer with metal powder fuels. The oxidizer was added to micron scale aluminum and zirconium powders by a remote injection system. When ignited with a high voltage spark, the mixtures were observed to possess reactivity comparable to nanocomposite reactive materials, with open-tube flame expansion velocities from 500 to 1400 m/s depending on fuel/oxidizer ratio and tube diameter. Temperatures were observed to range from 3000 to 3500 K as measured with gray body fits to 16-channel time-resolved pyrometer and time-integrated spectrometer data. These values were significantly below calculated adiabatic flame temperatures, which we attribute to local deviations from stoichiometry and kinetic/energetic limitations similar to those observed in studies of particles burning in high pressures gaseous oxidizers. Al/N₂O₄ reactivity was found to be most likely limited by the vaporization of the metal from the particle surface and Zr/N₂O₄ was limited by slower burning and complex interactions involving the solubility of nitrogen and oxygen in the molten Zr. We also discuss the potential for these materials to be used to create an “on/off” reactive material, since N₂O₄ can be added remotely and driven to evaporate via vacuum or purge of inert gases to return it to a safe condition.

在这里，我们介绍了采用四氧化二氮（N ₂ O ₄）与金属粉末燃料一起用作液体氧化剂。通过远程注射系统将氧化剂添加到微米级的铝和锆粉中。当用高压火花点火时，观察到混合物具有与纳米复合反应材料相当的反应性，根据燃料/氧化剂比和管径，开管火焰膨胀速度为500至1400 m / s。观察到的温度范围为3000到3500 K，这是通过灰体拟合到16通道时间分辨高温计和时间积分光谱仪数据测得的。这些值大大低于计算的绝热火焰温度，我们将其归因于与化学计量学和动力学/能量极限的局部偏差，类似于在高压气态氧化剂中燃烧颗粒的研究中观察到的那些。铝/氮发现₂ O ₄反应性很可能受到金属从颗粒表面的汽化的限制，而Zr / N ₂ O ₄受较慢的燃烧和涉及氮和氧在熔融Zr中溶解度的复杂相互作用的限制。我们还将讨论将这些材料用于创建“开/关”反应性材料的潜力，因为可以远程添加N ₂ O ₄并通过真空或吹扫惰性气体驱动其蒸发以使其恢复安全状态。