论文部分内容阅读
采用真空座滴法研究了高温下基体粗糙度对金属/金属非反应性润湿体系润湿性能的影响,所选材料体系为AgCu28/Cu。发现粗糙度可显著促进该润湿体系的润湿性能,随着粗糙度的增加,润湿角逐渐减小,最后趋近于一个最小值,而润湿半径随粗糙度线性增加。当金属液体在粗糙表面润湿时,其润湿模型可分为基体表面的粘性流动和微观V型槽内的毛细流动两部分,2种模式下的润湿动力学均符合幂指数规律。基体表面液滴的润湿驱动力符合杨氏方程,在微观V型槽流动时会存在一种额外的毛细管力,使体系最终润湿角变小,从而获得更好的润湿性。
The effects of substrate roughness at high temperature on the wettability of metal / metal non-reactive wetting system were studied by vacuum droplet method. The selected material system was AgCu28 / Cu. It is found that the roughness can significantly promote the wetting performance of the wetting system. As the roughness increases, the wetting angle gradually decreases and finally approaches a minimum value, while the wetting radius increases linearly with the roughness. When wetting the metal liquid on the rough surface, the wetting model can be divided into the viscous flow on the substrate surface and the capillary flow in the microscopic V-shaped groove. The wetting kinetics of the two modes all accord with the law of exponential. The wetting driving force of droplets on the surface of the substrate conforms to the Young’s equation, and an extra capillary force exists in the flow of the microscopic V-shaped groove, resulting in a smaller final wetting angle of the system to obtain better wettability.