No more ‘core-shell’ in binderjetting of bioceramics: Novel solution and experimental validation in microstructure and mechanical properties

Barui, S and Mishra, D and Gowtham, NH and Basu, B (2022) No more ‘core-shell’ in binderjetting of bioceramics: Novel solution and experimental validation in microstructure and mechanical properties. In: Journal of the European Ceramic Society, 43 (3). 1178 -1188.

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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. © 2022 Elsevier Ltd

Item Type:	Journal Article
Publication:	Journal of the European Ceramic Society
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd.
Keywords:	3D printers; Bioceramics; Density (specific gravity); Microstructure; Shells (structures); Yttria stabilized zirconia; Yttrium oxide, 3d binderjetting; Computer-aided design; Conventional approach; Core shell; Core-shell saturation; Experimental validations; Microstructures and mechanical properties; Novel solutions; Vertical slicing; Weibull modulus, Computer aided design
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Interdisciplinary Sciences > Centre for Biosystems Science and Engineering
Date Deposited:	05 Jan 2023 07:08
Last Modified:	05 Jan 2023 07:08
URI:	https://eprints.iisc.ac.in/id/eprint/78748

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