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2 results on '"Mona Yarahmadi"'

1. Polymer-Infiltrated Ceramic Network Produced by Direct Ink Writing: The Effects of Manufacturing Design on Mechanical Properties

Author

Junhui Zhang, Paula Pou, Ludmila Hodásová, Mona Yarahmadi, Sergio Elizalde, Jose-Maria Cabrera, Luis Llanes, Elaine Armelin, and Gemma Fargas

Subjects
direct ink writing, yttria-stabilized zirconia, polymer-infiltrated ceramic network, manufacturing design, mechanical properties, Technology, Chemical technology, TP1-1185
Abstract

Polymer-infiltrated ceramic network (PICN) materials have gained considerable attention as tooth-restorative materials due to their mechanical compatibility with human teeth, especially with computer-aided design and computer-aided manufacturing (CAD/CAM) technologies. However, the designed geometry affects the mechanical properties of PICN materials. This study aims to study the relationship between manufacturing geometry and mechanical properties. In doing so, zirconia-based PICN materials with different geometries were fabricated using a direct ink-writing process, followed by copolymer infiltration. Comprehensive analyses of the microstructure and structural properties of zirconia scaffolds, as well as PICN materials, were performed. The mechanical properties were assessed through compression testing and digital image correlation analysis. The results revealed that the compression strength of PICN pieces was significantly higher than the respective zirconia scaffolds without polymer infiltration. In addition, two geometries (C-grid 0 and C-grid 45) have the highest mechanical performance.

Published
2024
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2. Robocasting of dense 8Y zirconia parts: Rheology, printing, and mechanical properties

Author

Junhui Zhang, Mona Yarahmadi, Laura Cabezas, Marc Serra, Sergio Elizalde, Jose Maria Cabrera, Luis Llanes, Gemma Fargas, Universitat Politècnica de Catalunya. Doctorat en Ciència i Enginyeria dels Materials, Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria de Materials, and Universitat Politècnica de Catalunya. CIEFMA-PROCOMAME - Disseny Microestructural i Fabricació Avançada de Materials

Subjects
Compression strength, Ceramic materials, Materials Chemistry, Ceramics and Composites, Filament orientation, Enginyeria dels materials [Àrees temàtiques de la UPC], Rheology, 8Y-ZrO2, Materials ceràmics, Robocasting
Abstract

Advanced ceramics with complex geometry have become indispensable in engineering applications. Due to limitations of traditional ceramic fabrication processes, additive manufacturing represents a revolution for shaping and consolidation because of its unique capabilities for increasing shape complexity and reducing waste material. Among the additive manufacturing techniques, robocasting is often considered to yield fine and dense ceramic structures with geometrically complex morphology and high strength. Within this context, it is the objective to attain dense 8 mol% yttria-stabilized zirconia (8Y-ZrO2) by evaluating the influence of solid loading and filament orientation on the physical and mechanical properties of sintered parts. In doing so, a printable ink was developed using an inverse-thermoresponsive hydrogel. Results revealed that ceramic charges of 67.5 and 70 wt% achieved the best balance regarding density, hardness, and compression strength. Furthermore, rectilinear geometry with a filament orientation at 45º displayed higher mechanical response than 0/90º and cylindrical ones.

Published
2023
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