激光烧蚀下不同颗粒度Al-teflon的反应行为
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摘要
为研究不同颗粒度对Al-teflon反应行为的影响,以颗粒度25μm、1μm和20～200 nm的Al粉和微米级Teflon粉混合制备的反应材料为研究对象,基于脉冲激光烧蚀实验,结合ICCD相机和光谱仪对反应过程中的自发光成像和发射光谱进行瞬态观测。研究结果表明,Al-teflon反应材料在激光烧蚀下的反应行为体现出典型的二次反应特征,具有持续燃烧特征和明显的后燃效应,也具有较长的能量释放时间;同时,其反应行为与Al粉颗粒度密切相关:初始阶段,反应随Al粉颗粒度的降低加剧,随着反应的进行,纳米级Al粉对应的反应材料后续反应能力逐渐下降,反应强度和反应时间都小于1μm铝粉对应的反应材料。
In order to study reaction properties of Al-teflon with different particle sizes, we prepared Alteflon reactive material powders by mixing Al powder with particle sizes of 25 μm, 1 μm, and 20-200 nm,where micron-sized teflon powder as raw materials. The laser ablation experiments of Al-teflon reactive material were performed by a pulsed laser system. The self-luminescence imaging and emission spectra in the reaction process were collected and analyzed by ICCD camera and spectrometer. The results show that the reaction properties of Al-teflon reactive material under laser ablation reflect the characteristics of typical secondary reactions, together with continuous combustion characteristics and obvious afterburning effects,and the total energy release time is long. At the same time, the reaction properties is closely related to the particle size of Al powder. As the particle size of Al powder decreases, the reaction becomes more violently in the initial reaction stage. As the reaction progresses, the subsequent reaction capability of the corresponding reactive material with nano-Al size powder gradually decreases, the reaction intensity and reaction time are not as good as the corresponding reaction materials of 1 μm size aluminum powder.
In order to study reaction properties of Al-teflon with different particle sizes, we prepared Alteflon reactive material powders by mixing Al powder with particle sizes of 25 μm, 1 μm, and 20-200 nm,where micron-sized teflon powder as raw materials. The laser ablation experiments of Al-teflon reactive material were performed by a pulsed laser system. The self-luminescence imaging and emission spectra in the reaction process were collected and analyzed by ICCD camera and spectrometer. The results show that the reaction properties of Al-teflon reactive material under laser ablation reflect the characteristics of typical secondary reactions, together with continuous combustion characteristics and obvious afterburning effects,and the total energy release time is long. At the same time, the reaction properties is closely related to the particle size of Al powder. As the particle size of Al powder decreases, the reaction becomes more violently in the initial reaction stage. As the reaction progresses, the subsequent reaction capability of the corresponding reactive material with nano-Al size powder gradually decreases, the reaction intensity and reaction time are not as good as the corresponding reaction materials of 1 μm size aluminum powder.
引文
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[2]VASANT J S.Process for making polytetrafluoroethylene-aluminum composite and product made:6547993[P].US,2003-4-15.
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[4]赵鹏铎,卢芳云,李俊玲,等.活性材料PTFE/Al动态压缩性能[J].含能材料,2009,17(4):459-462.DOI:10.3969/j.issn.1006-9941.2009.04.020.ZHAO Pengduo,LU Fangyun,LI Junling,et al.The dynamic compressive properties of PTFE/Al reactive materials[J]. Chinese Journal of Energetic Materials,2009,17(4):459-462.DOI:10.3969/j.issn.1006-9941.2009.04.020.
[5]徐松林,阳世清,张玮,等.PTFE/Al含能复合物的本构关系[J].爆炸与冲击,2010,30(4):439-444.DOI:10.11883/1001-1455(2010)04-0439-06.XU Songlin,YANG Shiqing,ZHANG Wei,et al.A constitutive relation for a pressed PTFE/Al energetic composite material[J].Explosion and Shock Waves,2010,30(4):439-444.DOI:10.11883/1001-1455(2010)04-0439-06.
[6]AMES R G.Vented chamber calorimetry for impact-initiated energetic materials[C]//The 43rd AIAA Aerospace Sciences Meeting and Exhibit.Reno,Nevada,United States,2005:275-279.DOI:10.2514/6.2005-279.
[7]AMES R G.Energy release characteristics of impact-initiated energetic materials[C]//Proceedings of Materials Research Society Symposium.Boston,Massachusetts,United States,2005:0896-H03-08.1-10.DOI:10.1557/PROC-0896-H03-08
[8]刘艳君,肖贵林,陈军,等.活性药形罩毁伤性能仿真及实验研究[J].火工品,2017(3):18-21.DOI:10.3969/j.issn.1003-1480.2017.03.005.LIU Yanjun,XIAO Guilin,CHEN Jun,et al.Simulation and experimental study on the damage performance of reactive liner[J].Initiation&Pyrotechnics,2017(3):18-21.DOI:10.3969/j.issn.1003-1480.2017.03.005.
[9]肖艳文,徐峰悦,郑元枫,等.活性材料弹丸碰撞油箱引燃效应实验研究[J].北京理工大学学报,2017,37(6):557-561.DOI:10.15918/j.tbit1001-0645.2017.06.002.XIAO Yanwen,XU Fengyue,ZHENG Yuanfeng,et al.Experimental study on ignition effects of fuel-filled tank impacted by reactive material projectile[J].Transactions of Beijing Institute of Technology,2017,37(6):557-561.DOI:10.15918/j.tbit1001-0645.2017.06.002.
[10]ZHENG X X,ALEXANDER D C,WILLIAM L S,et al.Shock initiation of nano-al+teflon:time-resolved emission studies[J].Journal of Physical Chemistry:C,2013,117:4866-4875.DOI:10.1021/jp312637g.
[11]李金河,訾攀登,张旭,等.用组合式电磁粒子速度计研究一种活性材料的反应特性[J].高压物理学报,2017,31(3):309-314.DOI:10.11858/gywlxb.2017.03.013.LI Jinhe,ZI Pandeng,ZHANG Xu,et al.Reaction characteristics of reactive material investigated by embedded electromagnetic velocity gauges[J].Chinese Journal of High Pressure Physics,2017,31(3):309-314.DOI:10.11858/gywlxb.2017.03.013.