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| Home > Publications database > Rheological Behaviour of Drying Screen Printing Inks and their Final Properties |
| Home > Publications database > Rheological Behaviour of Drying Screen Printing Inks and their Final Properties |
| Conference Presentation (After Call) | FZJ-2018-00381 |
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2017
Abstract: Tailoring the final properties of screen printing films remains a mainly empirical task until today. For applications like solid oxide fuel cells and gas separation membranes, the packing density and the layer roughness after drying ceramic inks are of particular interest. The rheological ink properties, surface roughness, drying stresses from deflection measurements, the precise packing density and the mechanical properties of dried films were measured as a function of grain size of the starting zirconia powders, the solid content, the chain length of ethyl cellulose as binder and its concentration, and different dispersants and their concentration. It was found that compressive binder forces and lubrication effects dominated the packing of the particles. However, no general correlation between the individual rheological properties of the as prepared inks and the final properties of the dried films could be observed. Therefore, the viscosity and the drying stresses were measured additionally during the drying process by a Piezo Rotational Axial Vibrator and an optical stress measurement setup. A model that describes the drying behaviour was proposed which takes into account the tensile packing forces dominated by the grafting binder molecules and the internal friction between the particles. It was found to be in good agreement with the experimental data.
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