Fabrication of alternating layers of multimaterial ceramics with bioinspired microstructures

Ceramics are known for their high strength, stiffness, and hardness. However, they usually show poor toughness, which limits their use in applications that need to withstand damage. Previous studies have shown that bioinspired designs, such as the nacre-inspired layered arrangement of hard and soft...

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Main Author: Chang, Gwendolyn Yu Qian
Other Authors: Hortense Le Ferrand
Format: Final Year Project
Language:English
Published: Nanyang Technological University 2024
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Online Access:https://hdl.handle.net/10356/181575
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spelling sg-ntu-dr.10356-1815752024-12-14T16:45:59Z Fabrication of alternating layers of multimaterial ceramics with bioinspired microstructures Chang, Gwendolyn Yu Qian Hortense Le Ferrand School of Materials Science and Engineering Rohit Pratyush Behera Hortense@ntu.edu.sg, rohit.pb@ntu.edu.sg Engineering Ceramics are known for their high strength, stiffness, and hardness. However, they usually show poor toughness, which limits their use in applications that need to withstand damage. Previous studies have shown that bioinspired designs, such as the nacre-inspired layered arrangement of hard and soft layers (inspired by nacre in abalone shell), can help mitigate poor toughness. In particular, a layered arrangement to combine alumina and zirconia as hard and soft layer, respectively, could be interesting for structural, transport, energy absorption, biomedical applications, etc. However, the precise microstructural control and the interpenetrating distribution of alumina and zirconia is challenging. Therefore, in this study, precise composition and microstructural control are carried out to create nacre-inspired alumina-zirconia composites. To do so, first, commercially available plate-shaped microparticles (microplatelets) of alumina are magnetized with superparamagnetic iron-oxide nanoparticles (SPIONs). A slurry is then prepared consisting of alumina nanoparticles (np), zirconia nanoparticles, and magnetized alumina microplatelets in varying ratios to control the composition precisely. Thereafter, the magnetically assisted slip casting (MASC) process is applied using a rotating magnetic field to orient the magnetized alumina microplatelets in the in-plane direction with the nanoparticles of alumina and zirconia trapped in between in a layer-by-layer fashion until complete drying to control the microstructure precisely. Next, sintering is conducted to densify the samples using a templated grain growth (TGG) process, where the nanoparticles of alumina are consumed into the platelets to promote anisotropic grain growth while the zirconia particles remain in between the grown microplatelets. The microstructural, physical and mechanical property measurements indicate an optimum composition for a precise microstructural arrangement with high density that also provides high strength and toughness. Bachelor's degree 2024-12-10T05:39:43Z 2024-12-10T05:39:43Z 2024 Final Year Project (FYP) Chang, G. Y. Q. (2024). Fabrication of alternating layers of multimaterial ceramics with bioinspired microstructures. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/181575 https://hdl.handle.net/10356/181575 en application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering
spellingShingle Engineering
Chang, Gwendolyn Yu Qian
Fabrication of alternating layers of multimaterial ceramics with bioinspired microstructures
description Ceramics are known for their high strength, stiffness, and hardness. However, they usually show poor toughness, which limits their use in applications that need to withstand damage. Previous studies have shown that bioinspired designs, such as the nacre-inspired layered arrangement of hard and soft layers (inspired by nacre in abalone shell), can help mitigate poor toughness. In particular, a layered arrangement to combine alumina and zirconia as hard and soft layer, respectively, could be interesting for structural, transport, energy absorption, biomedical applications, etc. However, the precise microstructural control and the interpenetrating distribution of alumina and zirconia is challenging. Therefore, in this study, precise composition and microstructural control are carried out to create nacre-inspired alumina-zirconia composites. To do so, first, commercially available plate-shaped microparticles (microplatelets) of alumina are magnetized with superparamagnetic iron-oxide nanoparticles (SPIONs). A slurry is then prepared consisting of alumina nanoparticles (np), zirconia nanoparticles, and magnetized alumina microplatelets in varying ratios to control the composition precisely. Thereafter, the magnetically assisted slip casting (MASC) process is applied using a rotating magnetic field to orient the magnetized alumina microplatelets in the in-plane direction with the nanoparticles of alumina and zirconia trapped in between in a layer-by-layer fashion until complete drying to control the microstructure precisely. Next, sintering is conducted to densify the samples using a templated grain growth (TGG) process, where the nanoparticles of alumina are consumed into the platelets to promote anisotropic grain growth while the zirconia particles remain in between the grown microplatelets. The microstructural, physical and mechanical property measurements indicate an optimum composition for a precise microstructural arrangement with high density that also provides high strength and toughness.
author2 Hortense Le Ferrand
author_facet Hortense Le Ferrand
Chang, Gwendolyn Yu Qian
format Final Year Project
author Chang, Gwendolyn Yu Qian
author_sort Chang, Gwendolyn Yu Qian
title Fabrication of alternating layers of multimaterial ceramics with bioinspired microstructures
title_short Fabrication of alternating layers of multimaterial ceramics with bioinspired microstructures
title_full Fabrication of alternating layers of multimaterial ceramics with bioinspired microstructures
title_fullStr Fabrication of alternating layers of multimaterial ceramics with bioinspired microstructures
title_full_unstemmed Fabrication of alternating layers of multimaterial ceramics with bioinspired microstructures
title_sort fabrication of alternating layers of multimaterial ceramics with bioinspired microstructures
publisher Nanyang Technological University
publishDate 2024
url https://hdl.handle.net/10356/181575
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