Study on surface quality and mechanical properties of additive manufactured Al2O3 components by Lithography-based Ceramic Manufacturing

摘要

The Al2O3 ceramic components were fabricated precisely by a Lithography-based (Digital light processing, DLP) ceramic additive manufacturing technology.It was evaluated that the least surface roughness, warpage and flatness of the sintered Al2O3 was 0.68μm, 0.025mm and 0.017mm, respectively.And the flexural strength, the fracture toughness, the hardness and density of the sintered Al2O3 can reach to 507 ± 61MPa, 4.38 ± 0.36MPa·m1/2 and 10.80 ± 0.71GPa, 99.2％,respectively.Moreover, an anisotropic character of the ceramics surface quality was observed.The surface roughness of the horizontal surface was below 0.70μm, whereas it reached 1.23μm along the fabrication direction on the vertical surface.And the surface roughness, the warpage and flatness of sintered Al2O3 were apparently affected by the layer-by-layer manufacturing characters during DLP process.Furthermore, the corresponding microstructure of the additive manufactured Al2O3 parts were analyzed for the surface quality and mechanical performance.