Ag2O-石墨混合物非等温分解的动力学分析

摘要

The thermal decomposition kinetics of Ag2O-graphite mixture was systematically studied using a differential scanning calorimeter (DSC) in terms of model-fitting Malek approach, integral master plot method and model-free advanced isoconversional method of Vyazovkin. The results showed that the thermal decomposition occurred in two stages. The first step was the decomposition process of Ag2O to form porous silver particles as a complex process with the participation of at least two mechanisms, and the second step corresponded to the structural change from porous particles to silver bulk crystals as a single-step process.%根据模型拟合 Malek 法、积分主曲线法和无模型的先进等转化率法，采用差示扫描量热仪系统研究了Ag2O-石墨混合物热分解的动力学。结果表明，热分解包含两个阶段，在第一阶段，Ag2O分解形成多孔银颗粒，该过程复杂，至少存在两种机制；在第二阶段，多孔粒子发生结构变化而形成大块银晶体，此过程为单步过程。