【摘要】 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。更多还原

【Abstract】 In order to reveal the physical essence of the spreading process of reactive wetting,a sort of model of energy to explain the driving force and wetting mechanism was presented.The reactive wetting of molten A1 and Cu Si on graphite was studied by a modified sessile drop method under a vacuum,in which the contact angles were measured by ADSA software.The thermodynamic and kinetic processes of the typical reactive wetting were focused on,the thermodynamic equations of energy relations were derived,the interfacial energy of graphite and solid-liquid interfacial energy versus time at the triple line were calculated,and the dynamics model of interface energy is established.The presented dynamics model is verified by means of experimental results,and it is shown that solid liquid interfacial energy decreases with time in exponential relationship.It provides a new method for reference to explain the process from the angle of energy.更多还原