Study on the process of Al2O3 ceramics prepared by PVA hydrogel direct writing 3D printing
Using PVA hydrogel developed by hot dissolve quick freezing technology as binder,the stable Al2O3 ceramic slurry with certain theological properties was prepared,and the Al2O3 ceramic parts with complex shape were formed by self-designed pneumatic extrusion direct writing 3D printer.The theological behavior and extrudable printing conditions of Al2O3 ceramic slurry were studied.The results show that using PVA hydrogel as binder can prepare stable Al2O3 ceramic slurry that can be extruded at a uniform speed.The solid volume frac-tion suitable for direct writing 3D printing is 55％-65％.Increasing the solid volume fraction is conducive to 3D printing of slurry,reducing the drying sintering shrinkage of green body,and inhibiting sintering deformation.The bonding degree between green body layers and the flexural strength of sintered parts will be reduced with too high solid volume fraction.The optimal solid volume fraction obtained through experiments is 60％,and 3D printing of various shapes of ceramic parts has been achieved through process optimization.
direct 3D printingrheological propertynetwork ceramicsaluminaPVA hydrogel
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