The Study Of Al₂O₃ Ceramic 3D-printing Technology Based On Injection Molding

This paper combines 3D-Printing technology and injection molding for the rapid prototyping of Al₂O₃ green body,that is,the low viscosity,high solid loading and uniform thermoplastic Al₂O₃ ceramic suspension was prepared by the injection molding,and Al₂O₃ was fabricated by FDM 3D printing.The formulation of organic carrier in suspension was optimized in the experiment.The Al₂O₃ suspension?56 vol%?was made using paraffin wax with low viscosity and EVA hot-melt adhesive with good flexibility as organic binder,Solsperse 17000?0.7 wt%?as dispersant,stearic acid?2 wt%?as surfactant.Using the suspension as raw material for 3D printing of Al₂O₃ green body,and controlling the temperature from 95?to 115?,the printing of Al₂O₃ green body can be completed successfully between the temperature of95?¹15?.The ability of bond between the adjacent of Al₂O₃ layers become better with the temperature increasing.The occurrence of raw materials loss reported by others did not occur during the printing in this work,and the procedure of 3D printing was very smooth.The flexural strength of Al₂O₃ green body is 73.33 MPa,which was higher than green bodies prepared by other organic carrier reported by others.The green body was debinded by two-step debinding?first solvent and then thermal debinding?.The microstructure of the green body debinded was characterized by SEM,and there were no defects such as cracks.Al₂O₃ceramic with a density of 3.92 g/cm³ was obtained by pressureless sintering at 1600°C.