纳米铝粉掺杂太安炸药的激光烧蚀特性  

Laser Ablation Characteristics of PETN Explosive Doped With Nano⁃aluminum Powder

作　　者：吉祥波[1] 唐舵 覃文志[1] 高原[1] 朴俊宇 JI Xiang-bo;TANG Duo;QIN Wen-zhi;GAO Yuan;PIAO Jun-yu(Institute of Chemical Materials,China Academy of Engineering Physic(s CAEP),Mianyang 621999,China)

机构地区：[1]中国工程物理研究院化工材料研究所,四川绵阳621999

出　　处：《含能材料》2023年第6期598-605,共8页Chinese Journal of Energetic Materials

基　　金：国家自然科学基金(12072329)。

摘　　要：为探索低含量纳米铝粉掺杂炸药的脉冲激光作用过程,采用阴影测量系统研究了单脉冲激光烧蚀1%纳米铝粉掺杂太安(PETN)炸药的等离子体膨胀和冲击波特性,并利用激光诱导击穿光谱监测激光烧蚀过程中的特征光谱。结果表明:当脉冲激光辐照到纳米铝粉掺杂PETN炸药表面时,炸药表面形成高温等离子体,等离子体膨胀后压缩周围空气形成冲击波。冲击波在50 ns时传播速度为12500 m·s^(-1),随着时间的增加,等离子继续膨胀,冲击波向前推进速度降低。800 ns时,冲击波内部出现大量的喷溅物。Al原子和AlO气相分子的特征谱线都是在1μs的强度最大,到10μs时消失,表明脉冲激光烧蚀下,纳米铝粉与炸药的作用时间小于10μs。20 mJ激光能量下未检测到C原子和CN的光谱线。当激光能量增加到30 mJ时,纳米铝粉掺杂PETN炸药的光谱中出现C原子和CN的光谱线,表明纳米铝粉掺杂PETN炸药分解所需的激光能量应不少于30 mJ。In order to investigate the pulse laser action process of the explosives doped with nano‑aluminum powder,the plasma expansion and shock wave characteristics of single‑pulse laser ablation of the PETN explosives doped with 1%nano‑aluminum powder were studied by shadow measurement system,while the characteristic spectra of the explosives after laser ablation were investigated by laser induced breakdown spectroscopy(LIBS).The results showed that when laser pulses irradiate the surface of PETN explosive doped with nano‑aluminum powder,high temperature and high density plasma was formed,which expanded continuously and compressed the surrounding air to form shock wave.At 50 ns,the velocity of shock wave was 12500 m•s^(‑1).With the increase of time,the plasma continued to expand,the shock wave advanced forward and the velocity decreased.At 800 ns,a large number of ejection materials were observed in the shock wave.The maximum strength of the spectral lines of Al atom and AlO gas phase molecule were achieved at 1μs,and disappeared at 10μs,indicating that the interaction time between nano‑aluminum powder and explosive was less than 10μs.The spectral lines of C atom and CN were not detected at 20 mJ laser energy.When the laser energy increased to 30 mJ,the spectral lines of C atom and CN group were observed in the spectrum of PETN explosive doped with nano‑aluminum powder,and the spectral intensity increased with the increase of laser energy.Moreover,the laser energy required for the decomposition of the PETN explosives doped with nano‑aluminum powder should not be less than 30 mJ.

关 键 词：激光起爆 太安炸药 等离子体 激光诱导击穿光谱 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术] O433[机械工程—光学工程]