Abstract:According to parameters of micro-scale surface texture,the contact angle calculation formula of two wetting models were compared and analyzed.Four kinds of texture morphologies were processed on the surfaces of stainless steels by femtosecond laser system,then TiAlN coatings were deposited by PVD on the textured surfaces,and “Texture +TiAlN coating” surfaces were obtained.The contact angles of the solid surface before and after TiAlN coating deposition and texture processing were measured.The contact angle calculation model which was suitable for micro-scale was determined,and the mechanism affecting the wettability of micro-scale texture surface under different measurement conditions was analyzed and discussed.The results show that the deposited TiAlN coating has a very limited influence on the surface wettability,while the surface texture morphology parameters have a certain influence on the wettability.On the micro-scale,Wenzels calculation formula is more applicable to predict the contact angle,and the calculation result is closer to the actual measured value.The direction of a single texture and the arrangement of multiple textures have a great influence on the surface wettability.The larger the projection length of the texture,the smaller the contact angle,and the worse the wettability.
