Al粒径对富铝聚四氟乙烯基铝活性材料冲击反应性能的影响

doi:10.3969/j.issn.1000-1093.2022.01.006

摘要/Abstract

摘要： 为研究Al粒径对50%∶50%质量比的富铝聚四氟乙烯基铝(PTFE/Al)活性材料在中高应变率下的冲击反应行为的影响，采用模压烧结成型法制备了50 nm、10 μm、70 μm、200 μm 4种 Al粒径的PTFE/Al活性材料试件。基于分离式霍普金森压杆(SHPB)实验，利用高速摄像机拍摄不同应变率加载下PTFE/Al活性材料的冲击反应过程，分析Al粒径对PTFE/Al活性材料的冲击反应特性影响。实验结果表明:随着Al粒径从50 nm增加到10 μm，反应延迟时间增加可达40%，反应持续时间降低可达17%，同时PTFE/Al活性材料参与反应的量逐渐减少，反应激烈程度和能量释放不断降低，反应难以持续进行;当Al粒径增加到70 μm时，难以在SHPB加载下发生反应;加载应变率对PTFE/Al活性材料的反应性能也有较大的影响，PTFE/Al活性材料的反应延迟时间随着加载应变率的提高而降低;加载应变率和Al粒径对PTFE/Al活性材料的冲击反应扩散、反应速率、反应程度均有较大影响，可通过调节Al粒径来调节其冲击反应性能。

关键词: 聚四氟乙烯基铝活性材料, Al粒径, 分离式霍普金森压杆, 冲击反应

Abstract: The effect of Al particle size on the shock-induced reaction characteristics of PTFE/Al reactive material with a mass ratio of 50∶50 is investigated. 4 kinds of PTFE/Al reactive material specimens with different Al particle sizes were prepared by molding and sintering. The reactive material specimens were tested by using split-Hopkinson pressure bar (SHPB), and the shock-induced reaction processes of PTFE/Al reactive material at different strain rates were recorded with a high-speed camera. The results show that, as the Al particle size increases from 50 nm to 10 μm, the reaction delay rises up to 40% and the reaction duration decreases up to 17%, while the amount of reactive material participating in the reaction decreases, and the reaction intensity and energy release decrease. When the Al particle size increases to 70 μm, it is difficult to ignite under SHPB loading. The strain rate also greatly influences the reactive characteristics of reactive material,and the reaction delay of PTFE/Al reactive material decreases with the increase in the loading strain rate. The results show that Al particle size greatly influences the impact reaction diffusion, reaction speed, and extent of reaction of PTFE/Al reactive material, and its impact reaction property can be adjusted by adjusting Al particle size.

Key words: PTFE/Alreactivematerial, Alparticlesize, split-Hopkinsonpressurebar, shock-inducedreaction

中图分类号:

TJ410.4

胡榕，姜春兰，毛亮，祁宇轩，蔡尚晔，胡万翔. Al粒径对富铝聚四氟乙烯基铝活性材料冲击反应性能的影响[J]. 兵工学报, 2022, 43(1): 48-56.

HU Rong, JIANG Chunlan, MAO Liang, QI Yuxuan, CAI Shangye, HU Wanxiang. Effect of Al Particle Size on the Shock-induced Reaction Characteristics of Al-rich PTFE/Al Composites[J]. Acta Armamentarii, 2022, 43(1): 48-56.

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