Linking Rheology and Printability for Dense and Strong Ceramics by Direct Ink Writing

Abstract Direct ink writing of dense and strong ceramic objects remains an important open challenge. We develop a universal dimensionless criterion for printing such objects. Boehmite, an Al2O3 precursor, was used to assess the rheological properties leading to dense structures in ceramics manufactu...

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Autores principales:	Amin M’Barki, Lydéric Bocquet, Adam Stevenson
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1414c185ba1e4b4889bca0832b8b65b4
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spelling	oai:doaj.org-article:1414c185ba1e4b4889bca0832b8b65b42021-12-02T15:05:40ZLinking Rheology and Printability for Dense and Strong Ceramics by Direct Ink Writing10.1038/s41598-017-06115-02045-2322https://doaj.org/article/1414c185ba1e4b4889bca0832b8b65b42017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06115-0https://doaj.org/toc/2045-2322Abstract Direct ink writing of dense and strong ceramic objects remains an important open challenge. We develop a universal dimensionless criterion for printing such objects. Boehmite, an Al2O3 precursor, was used to assess the rheological properties leading to dense structures in ceramics manufactured by direct ink writing. Boehmite suspensions undergo time dependent gelation, thus providing a rheological laboratory of flow behaviours that can be correlated with printability requirements. We measured the evolution of rheological properties over several days and quantified the deformation of simple printed shapes at different aging times. We then identified the relevant physical parameters leading to printable suspensions. We defined a dimensionless number, Ξ, based on measured rheological properties, that predicts deformation of the printed object and determines the printability criterion. An important difference with this criterion is that Ξ necessarily accounts for capillary forces and gravitational slumping. We show that boehmite inks reach a printed shape fidelity > 90% when Ξ > 1, and that Al2O3 bars printed under these conditions can be sintered to 97% density, without printing defects, and have flexural strengths (500–600 MPa) competitive with commercial aluminas. Using Ξ, researchers can rationally design inks for printing dense materials by tailoring their rheological properties such that Ξ ≈ 1.Amin M’BarkiLydéric BocquetAdam StevensonNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Amin M’Barki Lydéric Bocquet Adam Stevenson Linking Rheology and Printability for Dense and Strong Ceramics by Direct Ink Writing
description	Abstract Direct ink writing of dense and strong ceramic objects remains an important open challenge. We develop a universal dimensionless criterion for printing such objects. Boehmite, an Al2O3 precursor, was used to assess the rheological properties leading to dense structures in ceramics manufactured by direct ink writing. Boehmite suspensions undergo time dependent gelation, thus providing a rheological laboratory of flow behaviours that can be correlated with printability requirements. We measured the evolution of rheological properties over several days and quantified the deformation of simple printed shapes at different aging times. We then identified the relevant physical parameters leading to printable suspensions. We defined a dimensionless number, Ξ, based on measured rheological properties, that predicts deformation of the printed object and determines the printability criterion. An important difference with this criterion is that Ξ necessarily accounts for capillary forces and gravitational slumping. We show that boehmite inks reach a printed shape fidelity > 90% when Ξ > 1, and that Al2O3 bars printed under these conditions can be sintered to 97% density, without printing defects, and have flexural strengths (500–600 MPa) competitive with commercial aluminas. Using Ξ, researchers can rationally design inks for printing dense materials by tailoring their rheological properties such that Ξ ≈ 1.
format	article
author	Amin M’Barki Lydéric Bocquet Adam Stevenson
author_facet	Amin M’Barki Lydéric Bocquet Adam Stevenson
author_sort	Amin M’Barki
title	Linking Rheology and Printability for Dense and Strong Ceramics by Direct Ink Writing
title_short	Linking Rheology and Printability for Dense and Strong Ceramics by Direct Ink Writing
title_full	Linking Rheology and Printability for Dense and Strong Ceramics by Direct Ink Writing
title_fullStr	Linking Rheology and Printability for Dense and Strong Ceramics by Direct Ink Writing
title_full_unstemmed	Linking Rheology and Printability for Dense and Strong Ceramics by Direct Ink Writing
title_sort	linking rheology and printability for dense and strong ceramics by direct ink writing
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/1414c185ba1e4b4889bca0832b8b65b4
work_keys_str_mv	AT aminmbarki linkingrheologyandprintabilityfordenseandstrongceramicsbydirectinkwriting AT lydericbocquet linkingrheologyandprintabilityfordenseandstrongceramicsbydirectinkwriting AT adamstevenson linkingrheologyandprintabilityfordenseandstrongceramicsbydirectinkwriting
_version_	1718388749991149568

Linking Rheology and Printability for Dense and Strong Ceramics by Direct Ink Writing

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