Preparation of high performance translucent alumina based on vat photopolymerization additive manufacturing

This study fabricated translucent alumina ceramics with varying MgAl 2 O 4 doping concentrations using vat photopolymerization (VPP) additive manufacturing combined with vacuum sintering. The influence of MgAl 2 O 4 content on the microstructure, mechanical properties, and optical characteristics was comprehensively investigated. Results demonstrate that optimal MgAl 2 O 4 doping (0.2 wt%) significantly enhances material densification, achieving superior mechanical performance with a flexural strength of 510 ± 30 MPa and fracture toughness of 3.7 MPa m 1 / 2 after sintering at 1700 °C, alongside improved optical transmittance. Microstructural characterization demonstrates that the MgAl 2 O 4 sintering additive promotes densification and grain refinement through effective suppression of abnormal grain growth and pore formation.