【作者】 李健；

【导师】 刘小君；

【作者基本信息】 合肥工业大学 ， 机械工程（专业学位）， 2017， 硕士

【摘要】 润湿现象会受到固体材料化学组成、表面微观结构和工况条件等的影响。当固体表面附着颗粒时对其界面润湿特性产生的作用效应受到了学者们的广泛关注。本文主要探究了颗粒与光滑原始表面和微织构表面润湿特性的关联性以及三维形貌参数对附着颗粒的微织构表面润湿性能的影响规律。本文选用45钢并通过激光打标技术制备出了包括光滑原始表面在内的7组具有不同微观结构的表面,通过改变附着表面颗粒的粒度、质量、颗粒数目、液滴体积等在7组表面上进行润湿试验,分别探究了颗粒对光滑原始表面和微织构表面润湿特性的影响规律。采用Talysulf CCI Lite非接触式三维光学轮廓仪对不同微织构表面进行了测量,并选用了适宜的ISO25178系列三维形貌表征参数进行了表征,并且探究了部分三维形貌参数与附着颗粒的微织构表面润湿特性的关联性。本研究的结果表明:固体表面附着颗粒时,润湿过程中的界面接触角具有一定的时间依赖性,即表现出一种先迅速减小后趋于稳定的变化趋势;附着颗粒的光滑原始表面的固液平衡接触角的变化趋势则是随着颗粒粒度的增大而减小,随着颗粒质量的增大而减小,随着下落液滴体积的增大而增大;同时在润湿过程中发现了颗粒捕捉现象,包括颗粒吸附现象和颗粒团聚现象;附着颗粒的微织构表面的润湿规律则表现出了接触角随着附着颗粒数目的增加而先增大后减小,随着润湿液滴体积的增大而增大的趋势。此外,附着颗粒的微织构表面的润湿特性受到了表面微凹坑形状和方向的影响,并与三维形貌表征参数中的S_ku、S_sk、S_tr、S_al、S_dq、S_dr、S_da、S_dv等之间表现出了极强的规律性。更多还原

【Abstract】 Wetting phenomenon will be affected by chemical composition of solid materials,microstructure of surface and working condition.What is being widely concerned is that when there are particles on the solid,the interfacial wetting characteristics will be affected.In this paper,we made a thorough inquiry about the relevance of wettability between particles and smooth original surface and between particles and micro texture surface,also includes the effect law between three-dimensional topography parameters and the micro texture surfaces.We chose 45 steel and prepared 7 group different micro-texture surfaces including smooth original surface.We carried out the wetting experences on the 7 group surfaces by changing size,quality and number of particles and droplet volume.We measured different micro texture surfaces by non-contact 3D Optical Profiler Talysulf CCI Lite and characterized these surfaces by ISO25178.And we explored the wetting relevance between some three-dimensional topography parameters and micro-texture surfaces adhered by particles.In the paper,we can concluded that when the solid surface were adhered by particles,the interfacial contact angle had a certain amount of time dependence,which showed a changing trend that diminished quickly before becoming a stable condition.There was a changing trend about the solid-liquid equilibrium contact angle of the smooth original surface that would decrease with increasing of particle size,and decrease with increasing of particle quality,and increase with increasing of droplet volume.At the same time,we discovered capture phenomenon of the particles in the wetting process,which included the phenomenon of particle birdnesting and the phenomenon of particle adsorption.On the micro-texture surfaces,there was a wetting law that the contact angle would decrease before increasing with increasing of particle number,and increase with increasing of droplet volume.In addition,the wetting property of micro-texture surfaces adhered by particles were effected by shapes and directions of surface micro-pits,what’s more,there was a strong regularity between the wetting property of micro-texture surfaces adhered by particles and some three-dimensional topography parameters such as S_ku,S_sk,S_tr,S_al,S_dq,S_dr,S_da,S_dv and so on.更多还原