直写打印参数及烧结条件对打印纳米银浆的影响OA

This study investigates the effects of extrusion pressure,needle inner diameter,sintering temperature,and sintering time on the sintering behavior of silver wires during the direct ink writing(DIW)process of nano silver paste.The relationship between these parameters and normalized mass,normalized resistance,cross-sectional area and resistivity of the sintered silver wires was analyzed.The results indicate that higher extrusion pressures and larger needle inner diameters lead to an increased presence of residual additives in the sintered silver wires;however,the larger cross-sectional area results in lower resistance for silver wires of the same length.Conversely,lower extrusion pressures and smaller needle inner diameters facilitate faster removal of solvents and additives,thus shortening the sintering time.Therefore,to achieve low resistance,a combination of higher extrusion pressure and larger needle inner diameter is recommended;for rapid sintering,a combination of lower extrusion pressure and smaller needle inner diameter is more suitable.At sintering temperatures of 120 and 140 °C,the normalized mass and normalized resistance stabilize after approximately 30 minutes,whereas at 160 and 180 °C,stabilization is achieved in only 10 minutes.In practical applications,depending on the substrate's thermal resistance,once may choose between lower temperatures with longer sintering times or higher temperatures with shorter sintering times to attain effective sintering.