利用淬火实验并结合XRD、SEM研究了燃烧合成Ti3AlC2粉体的机理.实验结果表明,燃烧合成Ti3AlC2粉体的机理是溶解再析出机制.即先生成的TiC晶核重新溶解到Ti-Al熔体中,同时三元碳化物开始析出并发育成层状结构.反应可以分为三个阶段:A.预热阶段;B.初始反应阶段;C.溶解析出阶段.
The formation mechanism of Ti3AlC2 powders by the combustion synthesis was investigated by analyzing the microstructure and phase content of the quenched sample. The results show that the mechanism of the reaction is a solution- precipitation mechanism: at first previously formed TiC particles dissolve in the Ti-Al melt, followed by the precipitation of ternary phase Ti3AlC2 that will grow into a layered morphology. The model of combustion synthesis of Ti3AlC2 can be divided into four stages: unreacted stage, preheating and initial reacting stage, dissolution and precipitation stage, completely reacted stage.
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