硼和聚四氟乙烯的高能配方,用于改善点火和氧化热释放

Prawal P.K. Agarwal, Themis Matsoukas
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引用次数: 0

摘要

硼(B)是理想的高能应用,由于高重量和体积能量密度。然而,它们的使用受到限制,因为它们表面的天然氧化壳通过充当扩散屏障和自重来限制氧化和热释放,而在氧化过程中不有助于热释放。本文报道了一种简单有效的方法,将B与全氟添加剂共混,以获得热释放增强的材料。我们使用聚四氟乙烯(PTFE)作为与氧化层放热反应的氟源,并使用热化学分析确定聚四氟乙烯的最佳组成,以从B中提取协同氧化和氟化反应产生的高能量。由于与聚四氟乙烯共混,也观察到B的点火温度降低。在这项工作中,我们确定了具有较低点火温度和较高氧化热释放的B/PTFE共混物。这些影响是由于氟通过放热反应对天然表面氧化物的气化,通过消除氧化剂向B粒子核心扩散的动力学/热力学屏障,促进了暴露金属芯中的增强反应。该研究证明了高能B/PTFE共混物的优化配方。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Highly energetic formulations of boron and polytetrafluoroethylene for improved ignition and oxidative heat release

Highly energetic formulations of boron and polytetrafluoroethylene for improved ignition and oxidative heat release
Boron (B) is desirable for energetic applications due to high gravimetric and volumetric energy densities. However, their use is limited because the native oxide shells on their surfaces limit oxidation and heat release by acting as a diffusion barrier and dead weight that does not contribute to heat release during oxidation. This paper reports a facile and efficient method of blending B with perfluoro additives to obtain materials with augmented heat release. We use polytetrafluoroethylene (PTFE) as a fluorine source that reacts with the oxide layer exothermally and use thermochemical analysis to identify the optimum composition of PTFE to extract high energy from B as a result of synergistic oxidation and fluorination reactions. The reduction in ignition temperatures of B is also observed due to its blending with PTFE. In this work, we determined B/PTFE blends with lower ignition temperature and higher oxidative heat release. These effects are due to the gasification of native surface oxide by fluorine via exothermic reactions that facilitate the enhanced reactions in the exposed metal core by eliminating the kinetic/thermodynamic barrier in the diffusion of the oxidizer to the B particle core. The study demonstrates the optimized formulation of highly energetic blends of B/PTFE for energetic applications.
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