Impact of debinding atmosphere and sintering additives on the fabrication of alumina ceramics via vat photopolymerization

Author(s)

Alves, P. L. A. ; Camargo, I. L. ; Verza, J. R. ; Luz, A. P.

• Document type: Journal article
• Source: CERAMICS INTERNATIONAL; v. 51, n. 7, p. 10-pg., 2025-02-28.

Abstract

Vat photopolymerization of ceramic suspensions has received considerable attention due to its high precision and exceptional resolution, enabling the fabrication of intricate ceramic components. However, the polymer-based network formed during the printing process must be heated gradually to ensure the efficient release of gases generated from the decomposition of organic compounds, thereby preventing the formation of cracks in the ceramic structure. An alternative strategy to achieve ceramics with optimal properties is the incorporation of sintering additives into the compositions, which reduces the sintering temperature while enhancing densification of the parts during thermal treatments. This study examines the influence of debinding atmosphere (air or N2) and sintering additives (TiO2 and Nb2O5) on the fabrication of alumina ceramics using digital light processing, employing a commercially available, cost-effective, bottom-up LCD printer. Optimized debinding in an inert (N2) atmosphere produced crack-free components with improved densification after sintering at 1400 degrees C and 1600 degrees C. Both additives were effective in altering the sintering behavior of alumina, increasing diffusion rates and promoting the formation of intergranular phases. As a result, specimens with a relative density of approximately 97.5 % were achieved. (AU)

• FAPESP's process: 23/08728-5 - Evaluation of the effect of mineralizing additives on the production of dense ceramic parts via additive manufacturing
• Grantee: Pedro Lucas Albuquerque Alves
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 24/04483-0 - Additive manufacturing of ceramic parts via FFF technique: optimizing fabrication parameters and debinding procedures
• Grantee: Ana Paula da Luz
• Support Opportunities: Regular Research Grants