Study on the Influence of Inlaid Silver Wire on the Properties of Composite Solid Propellant
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摘要:为研究嵌银丝对复合固体推进剂燃烧性能和安全性能的影响，制备了嵌银丝推进剂方坯，分别对嵌银丝和未嵌银丝推进剂的静态燃速、热稳定性、机械感度和静电火花感度进行了测试及对比分析。结果表明：嵌银丝后复合固体推进剂的静态燃速提高近6倍；动态升温模式下，嵌银丝后推进剂的初始分解峰温提前约16 ℃，峰形更加尖锐、反应剧烈且对温度的敏感程度更高；绝热模式下，嵌银丝后推进剂分解的比反应热、最大温升速率分别提高4.6%和12.5%，且热分解表观活化能降低28.4%；嵌银丝后推进剂的5 s延滞爆发点温度降低13 ℃，摩擦感度提高300%，热感度、机械感度显著提高，但静电火花感度极大地降低。
Abstract:To study the effect of silver filaments on the properties of composite solid propellant, the silver filament-embeded propellant billet was prepared. The static burning rate, thermal stability, mechanical sensitivity and electrostatic spark sensitivity of sliver wire embedded and normal propellant were evaluated and compared. Results show that the static burning rate of propellant is increased nearly 6 times after the silver wire is embedded. Under the dynamic heating mode, the initial decomposition peak temperature of the silver filament-embedded propellant is advanced by about 16 ℃, the peak shape is more sharp, the reaction is more intense and more sensitive to the temperature. In adiabatic mode, the specific heat of decomposition and maximum temperature rise rate of the propellant is increased by 4.6% and 12.5%, while the apparent activation energy of thermal decomposition is decreased by 28.4%. After inlaying silver wire, the 5s delay explosion point temperature of propellant is decreased by 13 ℃, the friction sensitivity is increased by 300%, thermal sensitivity and mechanical sensitivity increase significantly, while the electrostatic spark sensitivity is lowered greatly.
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