No more 'core-shell' in binderjetting of bioceramics: Novel solution and experimental validation in microstructure and mechanical properties. Issue 3 (March 2023)

• Record Type: Journal Article
• Authors: Barui, Srimanta; Mishra, Deepa; Gowtham, N.H.; Basu, Bikramjit
• Is Part Of: Journal of the European Ceramic Society. Volume 43:Issue 3(2023)
• Page Start: 1178
• Page End: 1188
• Publication Date: 2023-03
• Subjects: 3D Binderjetting -- Bioceramics -- Computer-aided design -- Core-shell saturation -- Vertical slicing -- Weibull modulus; 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.2022.10.055
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: During binderjetting of bioceramics, many commercial 3D printers dispense binder in a default 'core-shell' manner. Using such a conventional approach, more binder is dispensed at the periphery (shell) and less binder at the 'core' of the structure. The inhomogeneous binding of the powder particles from the shell to the core significantly impacts the microstructure and biomechanical properties. To address this, we hypothesised 'segmentation' of a 3D printable design file by slicing and discretising with an array of thin solid "segments", separated with an infinitesimal gap in a periodic manner. In this novel approach, the printing software commands the printhead to print each of the "segments" individually. The inter-segment and intra-segment binder "bleeding" among the segments results in a printed part with a homogeneously bound cross-section, without any "core-shell" effect. This hypothesis was experimentally validated by better microstructure, improved density, and enhanced mechanical strength properties in binderjet printed 3 mol% yttria stabilised ZrO2 .