A review on the rheological behavior and formulations of ceramic suspensions for vat photopolymerization

Vat photopolymerization is an additive manufacturing process that produces high-performance ceramic parts. A critical step in the process is the preparation of a suspension that meets the requirements of high ceramic loading and proper rheological behavior, since an increase in solid loading might c...

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Bibliographic Details
Published in:Ceramics international Vol. 47; no. 9; pp. 11906 - 11921
Main Authors: Camargo, Italo Leite de, Morais, Mateus Mota, Fortulan, Carlos Alberto, Branciforti, Marcia Cristina
Format: Journal Article
Language:English
Published: Elsevier Ltd 01.05.2021
Subjects:
3D printing
Additive manufacturing
Ceramics
Digital light processing
DLP
Rheology
Stereolithography
Viscosity
Viscosity
Digital light processing
Rheology
DLP
Additive manufacturing
Ceramics
Stereolithography
3D printing
ISSN:0272-8842, 1873-3956
Online Access:Get full text
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Summary:Vat photopolymerization is an additive manufacturing process that produces high-performance ceramic parts. A critical step in the process is the preparation of a suspension that meets the requirements of high ceramic loading and proper rheological behavior, since an increase in solid loading might compromise the suspension rheology, resulting in non-uniform layer recoating. This review examines the rheological behavior of ceramic suspensions for vat photopolymerization, discussing the influence of the suspension formulation (solid loading, ceramic particle size and size distribution, monomers, diluents, and dispersants) on rheological aspects such as viscosity, shear-thinning/thickening behavior, critical shear rate, yield stress, and thixotropy. It provides a summary of the best formulations, which achieved low viscosity (<3 Pa.s) and high solid loading (>40 vol%), and reports the main trends and challenges of ceramic vat photopolymerization, suggesting general guidelines for the preparation of highly loaded photocurable ceramic suspensions with low viscosity.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2021.01.031