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Tuning the morphological, ignition and combustion properties of micron-Al/CuO thermites through different synthesis approaches

机译：通过不同的合成方法调整微米Al / CuO铝热剂的形貌，着火和燃烧特性

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摘要

Aluminum (Al)-based thermite, due to its high energy density and low cost, has found wide applications in aerospace propulsion, explosion, pyrotechnics, thermal batteries, and power generations. Though significant efforts have been devoted to improving the ignition and combustion performance of Al-based thermites by using nano-Al, micron-Al (m-Al) remains of practical importance over nano-Al due to its lower cost and smaller dead mass. For m-Al based thermite, the main approach to improve its ignition and combustion performance is to bring Al and metal oxide as close as possible to facilitate the oxidizer diffusion process. Herein, we demonstrated two simple synthesis methods,i.e., the precipitation (PC) method and displacement (DP) method, to prepare m-Al/CuO thermites with the intention to bring Al and CuO to shorter diffusion distance and achieve better dispersion. The PC-thermites have flocculent nanostructured CuO closely attached to the surface of m-Al, and the DP-thermites have a dense shell of CuO coated on the surface of m-Al. Both PC- and DP-thermites have reduced agglomeration and diffusion distance over the traditional mechanically mixed (MM)-thermites that have randomly distributed and agglomerated CuO and m-Al. Consequently, both PC- and DP-thermites exhibit shorter ignition delay time, lower reaction onset temperatures, higher heat release, larger pressure rise, and extended reactivity limits than MM-thermites. Particularly, PC-thermites, due to their flocculent structures, exhibit the shortest ignition delay time, lowest reaction onset temperature, and highest amount of heat release. Moreover, the superior ignition and combustion performance of PC- and DP-thermites is more pronounced under high heating rates over low heating rates. Similar PC and DP methods are applicable to prepare diverse thermites with reduced diffusion distance and improved dispersion to improve their ignition and combustion properties.
机译：铝（铝）基铝热剂由于其高能量密度和低成本而在航空航天推进，爆炸，烟火，热电池和发电领域得到了广泛的应用。尽管已经致力于通过使用纳米铝来改善铝基铝热剂的着火和燃烧性能的巨大努力，但是微米铝（m-Al）相对于纳米铝仍具有实际的重要性，因为它的成本较低且死质量较小。对于基于m-Al的铝热剂，改善其着火和燃烧性能的主要方法是使Al和金属氧化物尽可能接近，以促进氧化剂的扩散过程。本文中，我们展示了两种简单的合成方法，即沉淀法（PC）和置换法（DP），以制备m-Al / CuO铝热矿，目的是使Al和CuO的扩散距离更短并实现更好的分散。 PC-半导体具有絮凝的纳米结构CuO，紧密附着在m-Al的表面，而DP-半导体则具有致密的CuO壳，包覆在m-Al的表面。与传统的机械混合（MM）-导热膏相比，PC-和DP-导热膏都减少了附聚和扩散距离，传统的机械混合（MM）-导热膏具有随机分布和聚集的CuO和m-Al。因此，与MM导热膏相比，PC和DP导热膏都具有更短的点火延迟时间，更低的反应起始温度，更高的热释放，更大的压力上升以及更大的反应活性极限。特别是，PC-导热膏由于其絮状结构而具有最短的着火延迟时间，最低的反应起始温度和最高的放热量。此外，在高加热速率下，低加热速率下，PC-和DP-thermites优异的着火和燃烧性能更加显着。相似的PC和DP方法可用于制备扩散距离减小和分散性改善的多种铝盐，以改善其着火和燃烧性能。

著录项

  • 来源
    《Combustion and Flame》 |2018年第9期|303-310|共8页
  • 作者

    Sili Deng; Yue Jiang; Sidi Huang; Xinjian Shi; Jiheng Zhao; Xiaolin Zheng;

  • 作者单位

    Department of Mechanical Engineering, Stanford University,Department of Mechanical Engineering, Massachusetts Institute of Technology;

    Department of Materials Science and Engineering, Stanford University;

    Department of Mechanical Engineering, Stanford University;

    Department of Mechanical Engineering, Stanford University;

    Department of Mechanical Engineering, Stanford University;

    Department of Mechanical Engineering, Stanford University;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Energetic materials; Thermites; Synthesis; Ignition; Combustion;

    机译：含能材料;铝热剂;合成;着火;燃烧;

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