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arXiv physics/0107026physics.chem-ph
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层状Ni-Al系燃烧动力学

Kinetics of Combustion in the Layered Ni-Al System

A. S. Shteinberg, V. A. Shcherbakov, Z. A. Munir

摘要:

本文对Ni-Al层状体系中的燃烧进行了理论分析和实验研究。燃烧波的温度和速度进行了测量和显微组织和成分的测定。后者是在完全燃烧的产物和淬火样品上用金相和电子探针分析制成的。根据化学动力学和热平衡方程计算了反应区温度与转化率的关系。发现该反应包括两个阶段:一个在液相中进行,另一个在固相中进行。前者决定燃烧速度,而后者决定绝热燃烧温度。在固体Ni在液态Al中溶解的假设下,计算了体相的放热速率和燃烧速度,实验结果与理论预测吻合较好。

英文摘要:

Theoretical analysis and experimental results on the combustion in the Ni-Al layered system are presented. Combustion wave temperature and velocity were measured and microstructural and compositional determinations were made. The latter were made on products of complete combustion and on quenched samples using metallographic and electron microprobe analyses. The dependence of temperature in the reaction zone on the degree of conversion was calculated from equations of chemical kinetics and heat balance. The reaction was found to involve two stages: one proceeding in the liquid phase and the other in the solid phase. The former determines the combustion velocity, while the latter determines the adiabatic combustion temperature. The rate of heat release in the bulk and the combustion velocity were calculated with the assumption that the reaction is controlled by the dissolution of solid Ni in liquid Al. The experimental results are in good agreement with theoretical predictions.

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