Abstract
The rheology of a ceramic paste is known to be a key factor in the process of additive manufacturing of ceramic parts via extrusion freeforming. The rheological properties of ceramic pastes can be influenced by several formulation parameters. In this study, the mutual influence between formulation parameters, printing properties and mechanical properties of ceramic pastes (Al2O3) and the resulting green bodies are investigated. Special focus is set on elucidating the origins and causes of the altered paste properties to allow targeted material development of pastes for the use in extrusion freeforming. Glycerine and nanoparticulate boehmite needles are tested as additives and they successfully improve the printability in the extrusion freeforming process of the paste and compression strength of the green body. Considerable difference in the dependency of the mechanical properties on the formulation parameters was detected after a partial sintering of the green bodies at 1000 °C. Dewatering, shrinkage during drying and a running of the deposited lines could be reduced successfully by adjusting the formulation. The impact of the formulation parameters on the printing performance could be linked to the dependency of the volume flow rate on the ratio of pressure over viscosity.
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