Shock-induced chemical reaction characteristics of PTFE-Al-Bi2O3 reactive materials

IF 5 Q1 ENGINEERING, MULTIDISCIPLINARY

Defence Technology(防务技术) Pub Date : 2024-06-01 DOI:10.1016/j.dt.2024.01.008

Chunlan Jiang, Rong Hu, Jingbo Zhang, Zaicheng Wang, Liang Mao

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引用次数: 0

Abstract

A ternary system of PTFE/Al/Bi₂O₃ is constructed by incorporating PTFE-based reactive material and thermite for enhancing the energy release of the PTFE-based reactive material. The effects of Bi₂O₃ in the PTFE/Al/Bi₂O₃ on both mechanical properties and the energy release were investigated through various tests such as thermogravimetry-differential scanning calorimetry, adiabatic oxygen bomb test and split Hopkinson pressure bar test. The microstructure observed through scanning electron microscope and X-ray diffraction results are used to analyze the ignition and reaction mechanism of PTFE/Al/Bi₂O₃. The results indicate that the PTFE/Al/Bi₂O₃ are capable of triggering the exothermic reaction of molten PTFE/Bi₂O₃ and Al/Bi₂O₃ over the PTFE/Al reactive materials, thereby promoting reactions. The excessive aluminum in the ternary system is beneficial for increasing energy release. The ignition of shock-induced chemical reactions in PTFE/Al/Bi₂O₃ is closely related to the material fracture. The dominant mechanism for hot-spot generation under Split Hopkinson Pressure Bar test is the frictional temperature rise at the microcrack after failure.

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PTFE-Al-Bi2O3 反应材料的冲击诱导化学反应特性

为了增强聚四氟乙烯基反应材料的能量释放，将聚四氟乙烯基反应材料和热敏剂结合在一起，构建了聚四氟乙烯/Al/Bi2O3 三元体系。通过热重-差示扫描量热法、绝热氧弹试验和分裂霍普金森压力棒试验等各种试验，研究了 PTFE/Al/Bi2O3 中的 Bi2O3 对机械性能和能量释放的影响。通过扫描电子显微镜观察到的微观结构和 X 射线衍射结果来分析 PTFE/Al/Bi2O3 的点燃和反应机理。结果表明，与 PTFE/Al 反应材料相比，PTFE/Al/Bi2O3 能够引发熔融 PTFE/Bi2O3 和 Al/Bi2O3 的放热反应，从而促进反应的进行。三元体系中过多的铝有利于增加能量释放。PTFE/Al/Bi2O3 中冲击诱导化学反应的点燃与材料断裂密切相关。在分体式霍普金森压力棒试验中，产生热点的主要机制是失效后微裂缝处的摩擦温升。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Defence Technology(防务技术) Mechanical Engineering, Control and Systems Engineering, Industrial and Manufacturing Engineering

CiteScore

8.70

自引率

0.00%

发文量

728

审稿时长

25 days

期刊介绍： Defence Technology, a peer reviewed journal, is published monthly and aims to become the best international academic exchange platform for the research related to defence technology. It publishes original research papers having direct bearing on defence, with a balanced coverage on analytical, experimental, numerical simulation and applied investigations. It covers various disciplines of science, technology and engineering.