Insights into combustion mechanisms of variable aluminum-based iron oxide/-hydroxide nanothermites

被引：17

作者：

Huebner, Jakob ^{[1
,2
,3
]}

Klaumuenzer, Martin ^{[1
]}

Comet, Marc ^{[1
]}

Martin, Cedric ^{[1
]}

Vidal, Loic ^{[4
]}

Schaefer, Michael ^{[1
]}

Kryschi, Carola ^{[2
,3
]}

Spitzer, Denis ^{[1
]}

机构：

[1] French German Res Inst St Louis, UNISTRA UMR 3208, CNRS, Nanomat Syst Sollicitat Extremes NS3E,ISL, 5 Rue Gen Cassagnou,BP 70034, F-68301 St Louis, France

[2] Friedrich Alexander Univ Erlangen Nuremberg, Inst Phys Chem 1, Dept Chem & Pharm, Egerlandstr 3, D-91058 Erlangen, Germany

[3] Friedrich Alexander Univ Erlangen Nuremberg, ICMM, Egerlandstr 3, D-91058 Erlangen, Germany

[4] Univ Haute Alsace, Inst Mat Sci, Rue Jean Starcky 15, F-68057 Mulhouse, France

来源：

COMBUSTION AND FLAME | 2017年 / 184卷

关键词：

Al-nanoparticles; Iron oxide/-hydroxide nanoscaled matrix; Coprecipitation; Nanothermite; Surface activation; Thermite reactivity; ENERGETIC MATERIALS; THERMITE REACTIONS; NANOPARTICLES; OXIDATION; TEMPERATURE; COMPOSITES; MAGNETITE; MAGHEMITE; NANO; INTERMEDIATE;

D O I：

10.1016/j.combustflame.2017.06.006

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Aluminum/iron oxide/-hydroxide nanothermite compounds were prepared and investigated in detail. The fast and facile synthesis was undertaken via a coprecipitation route of iron precursor species (sulfate, chloride) in presence of aluminum nanoparticles with an average diameter of 100 nm, terminated by an amorphous Al2O3 passivation layer. The only difference during synthesis is temperature, leading to a non-magnetic (at 20 degrees C) and magnetic (at 50 degrees C) nanothermite. HR-TEM and XRPD analysis reveal a predominantly amorphous iron oxide/-hydroxide nanoscaled matrix surrounding the aluminum nanoparticles. Moreover, aluminum nanoparticles and nanoscaled iron oxide/-hydroxide build up a hierarchical Al/Al2O3/FexOyHz, core/shell/shell structure in the case of the magnetic nanothermite. The non-magnetic nanothermite system lacks this significant structure. Finally, as-synthesized systems highly differ in reactivity, which is explained by their individual structural discrepancies. Values of flame propagation velocities and distinct threshold values of sensitivity to electrostatic discharge align with comparable reported aluminum/iron oxide aero- and xerogels in the literature. (C) 2017 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

引用

页码：186 / 194

页数：9

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