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Enhancing permeability and porosity of ceramic shells for investment casting through pre-wetting
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Abstract
In this study, a method known as pre-wetting is applied between the multilayer ceramic investment casting shells to enhance porosity and permeability while sustaining flexural strength. Pre-wetting consists predominately of an aqueous silica binder that improves inter-coat bonding in complex areas. Porosity is developed where the pre-wetting is applied due to the evaporation of the aqueous phase. Results indicate that as porosity increases, both green and fired flexural strength reduce on average by 8.7 15.6 % and 18.7 28.5 %, respectively, whereas hot strength is increased by 20 25 %. Permeability increased by a factor of two when pre-wetting was applied between intermediate coatings and displayed a stepwise increase in intrusion volume in the high-pressure regime through mercury intrusion porosimetry. X-ray microtomography coupled with pore network modelling provided a validation of the increase in the permeability constant. Gas adsorption methods revealed the presence of micropores through the alpha-s method when bilayers of pre-wetting solution were applied.
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Description
peer-reviewed
The full text of this article will not be available in ULIR until the embargo expires on the 10/09/2023
Publisher
Elsevier
Citation
Journal of the European Ceramic Society;41 (6), pp. 411-422
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Funding Information
Enterprise Ireland (EI), Science Foundation Ireland (SFI), European Regional Development Fund (ERDF), European Union (EU)