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在氩气气氛下,将Ag2O与石墨通过机械活化或热还原反应生成Ag,对其等温还原过程的动力学进行研究。结果表明,采用Johnson-Mehl-Avrami模型能合理地解释Ag2O与石墨经机械活化和热还原合成Ag的过程。采用相同的模型来研究机械活化和热还原反应合成Ag的动力学时,机械活化还原过程中的Avrami指数比热还原的要高;热还原和机械活化过程中的晶核长大机制分别是扩散控制和界面控制。
In argon atmosphere, Ag2O and graphite were reacted by mechanical activation or thermal reduction to form Ag, and the kinetics of isothermal reduction was studied. The results show that the Johnson-Mehl-Avrami model can reasonably explain the synthesis of Ag by mechanical activation and thermal reduction of Ag2O and graphite. Using the same model to study the kinetics of Ag synthesis by mechanical and thermal reduction reactions, the Avrami index during mechanical activation reduction is higher than that of thermal reduction. The nucleation mechanism during thermal reduction and mechanical activation is diffusion control And interface control.