【作者】 沈美；

【导师】 沈瑞琪； 叶迎华；

【作者基本信息】 南京理工大学 ， 军事化学与烟火技术， 2004， 硕士

【摘要】 本论文研究了激光与B／KNO₃相互作用过程中的烧蚀和等离子体现象，提出了激光与含能材料作用机理不仅是热传导的过程，而且是一个经历烧蚀以及等离子体化的过程，初步建立了考虑烧蚀因素的激光与含能材料作用的数学模型。 实验中通过扫描电镜观察药剂表面的烧蚀情况；通过平行电极板法研究等离子体现象；根据飞行质谱仪谱图分析产生的离子的成分；在B／KNO₃药剂表面加塑料薄膜以及在药剂中加入酚醛树脂进行激光点火性能的对比，根据感度和点火延滞期随激光能量密度的变化来反映激光产生的烧蚀及等离子体的强弱。 实验结果表明：（1）B／KNO₃的点火延滞期随激光能量的增加先增大后减小，并且存在一个最佳能量密度；（2）激光与B／KNO₃作用过程中存在烧蚀和等离子体现象；（3）酚醛树脂在B／KNO₃中起粘结作用，阻止因烧蚀和溅射导致物质和能量从作用药剂表面流入环境，提高了B／KNO₃的点火感度，降低了点火延滞期；（4）薄膜阻止了烧蚀物质量溅射和能量的流失，提高了激光能量的利用率；（5）飞行质谱仪谱图中离子间的复合现象证明了气相化学反应的存在。更多还原

【Abstract】 The phenomena of ablation and plasma in the process of laser ignition of B/KNO3 is studied in this paper. It is found that the interaction between laser and energetic materials is not only a process of heat transmission, but also a process of ablation and plasma. The mathematics model of interaction mechanism considering ablation is established in this paper too.The phenomenon of ablation is observed by EMS at ablated spots. The phenomenon of plasma is detected by a pair of parallel electrodes and the category of ions were detected by TOFMS. Phenol resin is added into the composite and a shirt of PVC was covered on the surface of the composite separately. The change of delay time of ignition shows influence of phenol resin and membrane of PVC.The studied results show that :(1) There is a best delay time of ignition. (2) The phenomenon of ablation and plasma are found in the interaction process between laser and energetic materials. (3) Phenol resin and Membrane of PVC can both prevent the energy and the mass transferring to environment and reduce the effect of ablation. (4) There is ion interaction in the gas phase.更多还原