The combustion reactivity of core-shell Al/Fluoropolymers and application in RDX-based explosives

IF 5.9 Q1 ENGINEERING, MULTIDISCIPLINARY

Defence Technology(防务技术) Pub Date : 2025-09-01 DOI:10.1016/j.dt.2025.04.016

Ting Liu , Jian Wang , Jie Chen , Cui Nie , Yaofeng Mao , Fude Nie , Ruolei Zhong , Wei Cao , Jun Wang

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引用次数: 0

Abstract

Aluminum (Al) powder is widely applied in thermobaric explosives due to its high energy density and favorable reaction kinetics. However, the inert oxide layer (Al₂O₃) on Al particles limits combustion reactivity and energy efficiency. Fluoride-based surface modification has been developed as an effective approach to address this issue. Here, four classical fluoropolymers (F11, F14, PVDF, PTFE) are employed as coatings to prepare core-shell Al/Fluoropolymer. The combustion experimental results demonstrate that the core-shell Al/PTFE exhibits the highest flame propagation rate (52.88 mm·ms⁻¹) and pressure output (109.02 kPa) performance. Consequently, core-shell Al/PTFE is selected as a high-energy fuel to prepare RDX/Al/PTFE microspheres via the emulsion and solvent evaporation method, which can enhance the energy performance of RDX. The effects of the core-shell Al/PTFE ratio and RDX content on the combustion heat and pressure output are systematically investigated. The peak pressure reaches a maximum of 187.8 kPa when the mass ratio of RDX, Al, and PTFE is 60: 25: 10. Additionally, RDX/Al/PTFE microspheres exhibit significantly higher laser-induced air shock velocities, detonation heat, and detonation pressure than those of pure RDX and RDX/Al. The mechanism underlying the enhanced reactivity and energetic performance is attributed to the ability of PTFE to etch the inert Al₂O₃ shell on the surface of Al particles, thereby improving post-combustion reactions and significantly increasing the overall energy output of RDX explosives. This work offers a novel design strategy for high-energy structural thermobaric explosives for the practical applications.

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核壳铝/氟聚合物的燃烧反应性及其在rdx基炸药中的应用

铝粉因其高能量密度和良好的反应动力学，在热压炸药中得到了广泛的应用。然而，铝颗粒上的惰性氧化层（Al2O3）限制了燃烧反应性和能量效率。氟化物基表面改性是解决这一问题的有效方法。本文采用四种经典含氟聚合物（F11, F14， PVDF， PTFE）作为涂层制备核壳铝/含氟聚合物。燃烧实验结果表明，芯壳Al/PTFE具有最高的火焰传播速率（52.88 mm·ms−1）和压力输出（109.02 kPa）性能。因此，选择核壳Al/PTFE作为高能燃料，通过乳液和溶剂蒸发法制备RDX/Al/PTFE微球，提高了RDX的能量性能。系统地研究了芯壳Al/PTFE比和RDX含量对燃烧热和压力输出的影响。当RDX、Al、PTFE的质量比为60:25:10时，压力峰值可达187.8 kPa。此外，RDX/Al/PTFE微球比纯RDX和RDX/Al微球表现出更高的激光诱导空气激波速度、爆轰热和爆轰压力。反应性和能量性能增强的机制是由于PTFE能够在Al颗粒表面蚀刻惰性Al2O3外壳，从而改善燃烧后反应，显著提高RDX炸药的总能量输出。本工作为高能结构热压炸药的实际应用提供了一种新的设计策略。

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.