Preparation Of Hydrophobic Surface Structure For Laser Melting Copper Nanoparticles

Surface functional structure manufacturing is to produce structures with different shapes,dimensions and functions on the surface of objects or structures.It can achieve surface modification while maintaining the characteristics of the matrix itself.Compared with traditional machining,it has unique characteristics,and has become the research focus of many disciplines at home and abroad in recent years.Hydrophobic surface functional structure is one of the most representative surface functional structures,which has been widely used in oil,medical and other fields.However,at present,the common machining methods of hydrophobic surface structure have some disadvantages,such as low flexibility,high pollution and narrow application range,which limit the application of manufacturing technology of hydrophobic surface structure.In this paper,a kind of selective laser melting technology is used to sinter copper nanoparticles onto the stainless steel substrate in the air environment to prepare the micro nano composite structure with hydrophobic function.In this paper,the principle of selective laser melting technology,process test and hydrophobic surface performance test are studied as follows:Based on the analysis of the interaction mechanism between laser and Cu nanoparticles,a simulation model of selective laser melting of Cu nanoparticles was established.The model was solved by level set method and interface tracking method to study the melting and solidification process between Cu nanoparticles.On this basis,the contour simulation model of selective laser melting forming based on stainless steel is established,the contour model of laser continuous machining is established,and the process of single laser scanning is tracked.It is observed that the simulation shape of vertical section is consistent with that of the actual processing.To study the interaction mechanism of the components in the dispersion of copper nanoparticles during the selective laser melting process,to determine the types of the components in the dispersion through the chemical reaction equation,to determine the proportion of the components through the processing test,and to configure a reasonable copper nanoparticles dispersion.The automatic refitting of selective laser melting test system can realize automatic coating dispersion and automatic heating process.The system is used to study the selective laser sintering of single and plane process,to establish the laser process parameter window,and to analyze and summarize the influence of laser power and scanning speed on the surface profile of experimental products.On the basis of the experiment of selective laser melting Cu nano dispersion,the grid like surface with micro nano composite structure was prepared on the stainless steel substrate.The influence of grid size and the time of surface energy reduction on the hydrophobic properties of the product was studied by static hydrophobic test.The maximum static contact angle of the grid surface is more than 150 °,which has reached the super hydrophobic level.In addition,the dynamic hydrophobicity of the grid structure is verified by the dynamic hydrophobicity test.