Optimization of mechanical properties of robocast alumina parts through control of the paste rheology. Issue 7 (July 2023)

• Record Type: Journal Article
• Authors: Maillard, Mathilde; Chevalier, Jérôme; Gremillard, Laurent; Baeza, Guilhem P.; Courtial, Edwin-Joffrey; Marion, Sarah; Garnier, Vincent
• Is Part Of: Journal of the European Ceramic Society. Volume 43:Issue 7(2023)
• Page Start: 2805
• Page End: 2817
• Publication Date: 2023-07
• Subjects: Additive manufacturing -- Robocasting -- Rheology -- Strength -- Fracture; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2022.12.008
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Robocasting, or Direct Ink Writing, can be used to create dense mono- or multi-materials ceramic parts using micro-extrusion of ceramic pastes through needles, whose position is controlled in 3D. Rheological properties of the ceramic pastes, printing parameters and thermal post processes (drying, debinding and sintering) are key parameters to control the quality of the printed parts. In this work, the rheological properties (including yield stress, shear-thinning behavior, storage/loss moduli and recovery time) of alumina pastes were characterized. Correlations were established between on one side the rheological properties and the printing conditions and on the other side the extrudability, the shape fidelity and the mechanical performance of the final parts. This paper thus defines an extended definition of printability, which includes functional requirements of the final parts in addition to the more classical processability criteria.