Reaction Mechanism of Combustion Synthesis of TiAl Intermetallic Compound
Reaction Mechanism of Combustion Synthesis of TiAl Intermetallic Compound
复制标题
燃烧合成TiAl金属间化合物的反应机理
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
R. Watanabe
中科院分区：
文献类型：
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作者：
A. Hibino;R. Watanabe
通过对Ti和Al混合粉末压坯中反应过程的观察和反应动力学的模型计算，分析了燃烧合成TiAl金属间化合物的反应机理。将Ti和Al粉末的预混料在电炉中真空加热，使其发生自持反应。测量了反应的温升，观察了反应过程中的显微组织演变，并对产物进行了X射线物相分析。观察到，在A1熔点处，Al熔体包围了Ti颗粒，反应开始并向Ti颗粒中心进行。采用考虑微观结构变化的球壳模型对合成反应进行了分析。分析表明，反应随反应时间的延长而加速，这与观察到的自维持反应一致。Al在TiAI中的扩散以及TiAl和Ti之间的界面反应的相对贡献也根据Ti的粒径进行了量化。
The reaction mechanism of combustion synthesis of a TiAl intermetallic compound was analyzed by the observation of the reaction process in Ti and Al mixed powder compacts and by a model calculation of the reaction kinetics． A premix of Ti and Al powders was vacuum−heated in an electric furnace to cause self− sustaining reaction． The measurement of the rise in the temperature， the observation of microstructural evolution involved in the reaction process and X−ray phase analysis of the product were performed． It was observ6d that at the melting point of A1， Al melt surrounded Ti particles and the reaction started and pro− ceeded towards the center of the Ti particle． The synthesis reaction has been analyzed using a spherical shell model which takes into account the microstructural change． The analysis has shown that the reaction is accelerated with reaction time， which is in accordance with the observed self−sustaining reaction． The relative contribution of the diffusion of Al in TiAI and the interface reaction between TiAl and Ti has also been quantified in dependence on the Ti particle size．