Drying Behaviour of Al2O3 Inks Containing Carboxymethylcellulose (CMC) for Use in Colloidal Processing

One of the most important steps in extrusion processing ceramic inks is initial drying parts. This study aimed to investigate behaviour an Al2O3-based ink optimised be processed by methods, e.g., direct writing. Carboxymethylcellulose (CMC) was singly added a suspension deionised water and Al2O3 (50:50 wt.%) perform as dispersing plasticising agent. To assess moisture loss function time, were extruded into two types polymeric moulds: one with completely closed profile producing cylindrical samples (disks) open bars. After injection inks, moulds exposed different controlled temperatures (20 40 °C) for up 180 h; warpage periodically measured, exponential mathematical expressions (moisture × time) obtained. The Al2O3-bars dried 24 h at 20 °C presented longitudinal warpages 4.5% 9%, respectively, while disks 3.5% 7% these same °C, respectively). sintered 1610 4 characterised scanning electron microscopy (SEM), relative density (Archimedes principle), X-ray diffraction (XRD), presenting 92.3 ± 0.5%, α-Al2O3 crystalline phase grain equiaxed morphology varying between 1 5 μm.