Abstract
The preparation of high solids loading Al 2 O 3 paste is of great significance for improving the properties of ceramics formed by UV-curing. However, the solid contents of alumina slurry used by digital light processing (DLP) and traditional alumina paste for stereolithography (SLA) are both less than 80 wt%. With increase in solid content, the viscosity of paste increases sharply, and rheological property deteriorates. In this study, ceramic paste containing 85 wt% (62 vol%) Al 2 O 3 was prepared for SLA-3D printing of ceramics, and more than 85 wt% solid content was achieved by dispersant and other additives. Effects of different dispersants on rheological and curing properties of Al 2 O 3 ceramic paste were studied. At room temperature, the viscosity of 85 wt% Al 2 O 3 ceramic paste was 51733 mPa s at shear rate of 30 s −1 . A novel method was proposed to control curing deformation of parts during printing. As-manufactured ceramic did not show any cracks by naked eye and exhibited excellent mechanical properties, with three-point bending strength of 540 MPa, fracture toughness of 4.19 MPa m 1/2 , Vickers hardness of 16 GPa, surface roughness of 0.463 μm, and density of 3.86 g/cm 3 .
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