Fabrication of Three-dimensional Dense Alumina Ceramics by DLP Stereolithography

Abstract

Additive manufacturing is an innovative manufacturing technique for producing a three-dimensional complex shape. This study was examined the influence of sub-micron alumina slurry properties and modeling conditions on the fabrication of three-dimensional alumina bodies by using digital light projection stereolithography （DLP-SLA）. Relationship between cure depth and energy dose was amenable to the Beer-Lambert law. The cure depth was greatly affected by alumina slurry concentration. However, there was no significant difference between the cure depth at the slurry concentration 50～75mass％. The viscosity was adjusted to slurry concentration 65～75mass％ to be less than 3000mPa･s. Three-dimensional cube lattice alumina green bodies were modeled layer-by-layer under the condition of energy dose 8～30mJ/cm² and layer thickness 25～100μm. After debinding and sintering, dense alumina sintered bodies were obtained close to the design of CAD data.