摘要
为研究温度冲击、温度循环等温度交变环境对激光火工品发火时间的影响规律及作用机理,采用掺杂炭黑的高氯酸·四氨·双(5-硝基四唑)合钴(BNCP)为始发药剂及光纤窗口结构的激光火工品为实验样机,对经历47 h和94 h温度交变实验后的掺杂BNCP始发药剂性能、激光火工品结构变化、药剂和光纤约束情况进行了研究。结果表明,温度交变前激光火工品发火时间具有小于0.2 ms的高瞬发性,经历47 h温度交变后,发火时间会延迟至0.5 ms以上;随着温度交变时间的增长,达到94 h后个别产品发火延迟时间超过1 ms,甚至出现瞎火情况。掺杂BNCP始发药经历47 h的温度交变环境后出现碎晶,堆积密度从0.43 g·cm^(-3)降低到0.32 g·cm^(-3),但碎晶现象不影响药剂的热分解性能及激光火工品的发火性能。温度交变环境下,火工品壳体结构与药剂膨胀系数的差异导致光纤和药剂间出现点火间隙,点火间隙同时影响激光光斑强度与热点的扩散效应,进而影响发火。通过增强药剂和光纤之间的约束可有效减少温度交变情况下点火间隙的产生,提高激光火工品的环境适应能力。
In order to explore the influence of temperature impact and cycling on ignition time of laser pyrotechnics,the laser initiators with carbon doped tetraammine bis(5-nitrotetrazolato)cobalt(Ⅲ)perchlorate(BNCP)as primary explosive and fiberwindow structure were employed to study performance of BNCP,structure change of laser initiators and structural constraint between fiber and explosive under different temperature alternating experiments(47 h and 94 h).The experiment results show that the ignition time can reach less than 0.2 ms indicating a great ignition performance before temperature alternating experiment.However,the ignition time delayed more than 0.5 ms after 47 h temperature alternating experiment and some initiators delayed more than 1 ms even misfired after 94 h temperature alternating experiment.The crystal grains of BNCP broke up and the bulk density decreased from 0.43 g·cm^(-3) to 0.32 g·cm^(-3) after alternating temperature experiment.However,the change of bulk density has no influence on thermal decomposition and ignition performance.The difference of expansion coefficient between ceramic fiber optic components and igniter shell leads to a gap between fiber and doped BNCP during alternating temperature experiment.The gap has a great influence on both laser spot intensity and hot spot diffusion.With structural constraints of fiber and explosive increasing,the ignition gap can decrease effectively during alternating temperature environment and the environment adaptability of laser initiators can be improved.
作者
先明春
佟乐乐
矫金福
谢浚尧
张月萍
孟燕刚
陈勇
周彬
沈瑞琪
XIAN Ming-chun;TONG Le-le;JIAO Jin-fu;XIE Jun-yao;ZHANG Yue-ping;MENG Yan-gang;CHEN Yong;ZHOU Bin;SHEN Rui-qi(School of Chemistry and Chemical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China.;Sichuan Aerospace Chuannan Initiating Explosive Technology Limited,Luzhou 646000,China)
出处
《含能材料》
EI
CAS
CSCD
北大核心
2023年第3期243-250,共8页
Chinese Journal of Energetic Materials
基金
装备预研航天科技联合基金项目(6141B06210501)。
关键词
激光火工品
BNCP
温度交变
点火间隙、点火延迟、环境适应性
laser ignited initiators
BNCP
alternating temperature
ignition gap
ignition delay
environmental adaptability
