Сombustion of Micro- and Nanothermites under Elevating Pressure

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• 作者：K. Monogarov^a ; ^{a7777@center.chph.ras.ru" class="auth_mail" title="E-mail the corresponding author} ; Alla Pivkina^a ; ^b ; N. Muravyev^a ; D. Meerov^a ; D. Dilhan^c
• 关键词：Nanothermite ; thermite ; heating ; burning ; combustion
• 刊名：Physics Procedia
• 出版年：2015
• 出版时间：2015
• 年：2015
• 卷：72
• 期：Complete
• 页码：362-365
• 全文大小：209 K

文摘

Non-equilibrium process of combustion-wave propagation of thermite compositions (Mg/Fe2O3) inside the sealed steel tube have been investigated to study the burning rate at elevating pressure. Under confinement the hot gas-phase products, formed during thermite combustion result in considerable overpressure inside the tube that reverses the gas flow and leads to pressure-driven preheating effect of the burned-gas permeation. Convective origin of this preheating effect is discussed. The pressure-time dependency is obtained experimentally. The composition was pressed inside the steel tube in pellets; the size of each part was measured to obtain burning rate – pressure dependency. Both micro- and nanosized components were used to prepare thermite compositions under study. The significant difference in burning parameters of micron- and nanosized thermites is observed and analyzed. Based on obtained results, the combustion mechanism of thermites with the micro- and nanosized components is discussed.