Design And Experimental Study Of Aerosol Jet Printing System With Double-sheath Structure

Aerosol jet printing technology has broad prospects in the field of electronic manufacturing by virtue of its advantages such as high resolution.However,there are still problems such as overspray and satellite droplets.In this paper,the structure design of aerosol printing head is used to reduce overspray and satellite droplet area.Aerosol jet printing head with double sheath gas structure was designed.On this basis,aerosol jet printing system was constructed,the main process parameters affecting focus and spraying were simulated.The influence of main process parameters on focus and jet was simulated.The influence of main process parameters on the quality of printing was studied experimentally.The experimental study on the fabrication of supercapacitor electrode by aerosol jet printing was carried out.The main research contents of this paper are as follows:（1）The aerosol printing head and aerosol printing system with double-sheath structure were designed and constructed.Aerosol jet printing head with double-sheath structure and aerosol generating device based on piezoelectric ceramic atomizing sheet were designed.On this basis,the aerosol printing system consists of four modules:aerosol generating module,printing module,temperature control module and motion control module.（2）The computational fluid dynamics analysis of the internal flow field of the aerosol printing head with double-sheath structure was carried out.The three-dimensional internal flow channel model of aerosol printing head was established.ANSYS Fluent was used to analyze the internal flow field of the aerosol printing head by computational fluid dynamics.（3）The experimental study on the main factors affecting the quality of aerosol jet printing was carried out.Based on the established aerosol printing system,an experimental study on the printing lines of Ti₃C₂T_X ink was carried out.The controlled variable method was used to carry out experimental research on the main factors that affect the morphology of printing lines,such as the carrier gas flow rate,the primary focusing ratio and the secondary focusing ratio.The research results show that the line width and line height are directly proportional to the carrier gas flow,the line width is inversely proportional to the primary and secondary focusing ratios,and the line height is directly proportional to the primary and secondary focusing ratios.The better process parameters was obtained through experimental research,and lines were printed on the PET substrate.When the number of layers of the printed lines is 10,the minimum resistance value of 2.7Ωis obtained.（4）The fabrication and performance analysis of Ti₃C₂T_X supercapacitor electrodes based on aerosol jet printing were carried out.The constructed aerosol jet printing system was used to print Ti₃C₂T_X ink on foam nickel to fabricate supercapacitor electrodes.Two supercapacitor electrode with 150 layers of printed layers were assembled into one plane symmetrical supercapacitor.The structure and electrochemical performance of the supercapacitor electrode had been analyzed,and it was concluded that the mass specific capacity of one single electrode is proportional to the number of printed layers and inversely proportional to the scanning rate.According to calculation,the maximum mass specific capacity under the CV curve can reach35.6 F/g,the maximum mass specific capacity under the GCD curve can reach 21.2 F/g,and the minimum ESR can reach 0.697Ω.According to analysis,the assembled supercapacitor reaches the maximum energy density of 3.1Wh/kg when the power density is 2.5W/kg.