论文部分内容阅读
本文从燃烧温度（Tc）、反应速度（ΔT／t）、产物相组成几个方面研究了CaF2在MgO-Al2O3-Al体系燃烧过程中的作用。研究结果表明：CaF2具有破坏氧化膜、活化反应的作用。Tc和ΔT／t均随着CaF2的增加而升高，当减小Al粉粒度时，CaF2的作用更为显著。热力学计算证明，在1200℃时，CaF2与Al2O3反应生成低熔点中间相（3CaO·Al2O3），促进了Al2O3膜与周的分离，加快了铝的氧化，提高了反应体系的燃烧温度。
In this paper, the effect of CaF2 on the combustion process of MgO-Al2O3-Al system was studied from the aspects of combustion temperature (Tc), reaction rate (ΔT / t) and product phase composition. The results show that CaF2 has the effect of destroying the oxide film and activating the reaction. Both Tc and ΔT / t increased with the increase of CaF2. The effect of CaF2 was more obvious when the particle size of Al was decreased. Thermodynamic calculations show that at 1200 ℃, CaF2 reacts with Al2O3 to form low melting point mesophase (3CaO · Al2O3), which promotes the separation of Al2O3 film from the surroundings, accelerates the oxidation of aluminum and increases the combustion temperature of the reaction system.