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.
Original language | English |
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Pages (from-to) | 411-422 |
Number of pages | 12 |
Journal | Journal of the European Ceramic Society |
Volume | 41 |
Issue number | 16 |
DOIs | |
Publication status | Published - Dec 2021 |
Keywords
- Ceramic shell
- Investment casting
- Modulus of rupture
- Permeability
- Porosity
- Pre-wetting
- Primary facecoat