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为了揭示反应润湿扩散过程的物理本质,提出一种解释其驱动力和润湿机理的能量模型。在真空条件下采用通管滴落法,研究熔融的Al及Cu-Si合金在石墨基板上的反应润湿铺展过程,由轴对称形状分析软件(ADSA)测量摄入图像的接触角。研究典型反应润湿的热力学和动力学过程,推导能量关系的热力学方程,计算石墨表面能和三相线处固-液界面能相对于时间的变化值,并建立关于界面能的动力学模型。借助实验验证该模型的合理性,表明在反应过程中固液界面能随时间呈指数关系下降。从能量角度可为反应润湿过程提供一种新的解释方法。
In order to reveal the physical nature of the reactive wetting and diffusion process, an energy model explaining its driving force and wetting mechanism was proposed. Under vacuum condition, drip method was used to study the reactive wetting and spreading process of molten Al and Cu-Si alloy on graphite substrate. The contact angles of ingested images were measured by Axisymmetric Shape Analysis Software (ADSA). The thermodynamic and kinetic processes of typical reaction wetting are studied. The thermodynamic equations of energy relationship are deduced. The changes of the surface energy of graphite and the solid-liquid interface at time of three-phase line are calculated, and the kinetic model of interfacial energy is also established. The rationality of this model is validated experimentally, which shows that the solid-liquid interface can decrease exponentially with time in the reaction process. From the energy point of view, it can provide a new explanation for the reaction wetting process.