Mechanism of Molten-Salt-Controlled Thermite Reactions
Mechanism of Molten-Salt-Controlled Thermite Reactions
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DOI：
10.1021/ie2003544
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发表时间：
2011-10-05
影响因子：
4.2
通讯作者：
Kharatyan, Suren L.
中科院分区：
文献类型：
--
作者：
Manukyan, Khachatur V.;Kirakosyan, Khachatur G.;Kharatyan, Suren L.
研究了盐控MoO 3 + Mg + NaCl铝热反应的化学组成和相形成机理。结果表明，该体系的结构和相形成机理主要取决于初始混合物中的盐含量。在贫盐混合物中，产物颗粒的成核发生在熔融镁中，而在富盐条件下，产物主要在熔融氯化钠中形成。燃烧温度曲线和产物微观结构的分析以及反应混合物的热分析表明，氧化钼在该过程的早期阶段与盐反应。形成的中间体氯氧化钼和氯化钠然后与镁反应，产生Mo、MgO和NaCl相。燃烧过程的活化能（50 kJ/mol）的低值也表明，气体（液体）中间体在相形成机制中起着重要的作用。
The present work was undertaken to study the chemistry and phase formation mechanism in the salt-controlled MoO3 + Mg + NaCl thermite reaction. It was found that the structure and phase formation mechanism in the studied system primarily depend on the salt content in the initial mixtures. In salt-poor mixtures, nucleation of product particles takes place in the molten magnesium, whereas under salt-rich conditions, products are mainly formed in molten sodium chloride. Analyses of combustion temperature profiles and product microstructures and thermal analysis of reacting mixtures suggested that the molybdenum oxide reacts with the salt at early stages of the process. The formed intermediate molybdenum oxychloride and sodium molybdate then react with magnesium, yielding Mo, MgO, and NaCl phases. The low value of the activation energy (50 kJ/mol) of the combustion process also suggests that gaseous (liquid) intermediates play an important role in the phase formation mechanism.