Fabrication of lightweight and ultrahigh strength close-cell ceramic foams through sacrificial template method

The effects of porosity in ceramic composites, including zirconia and alumina-reinforced material, on its properties was examined in this study. Using the sacrificial template approach, the content of phenolic microballoon was adjusted to make dense and porous Alumina toughened zirconia (ATZ) cerami...

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محفوظ في:
التفاصيل البيبلوغرافية
المؤلف الرئيسي: Tan, Alice Shi Yi
مؤلفون آخرون: Gan Chee Lip
التنسيق: Final Year Project
اللغة:English
منشور في: Nanyang Technological University 2022
الموضوعات:
الوصول للمادة أونلاين:https://hdl.handle.net/10356/156798
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المؤسسة: Nanyang Technological University
اللغة: English
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spelling sg-ntu-dr.10356-1567982022-04-23T13:19:40Z Fabrication of lightweight and ultrahigh strength close-cell ceramic foams through sacrificial template method Tan, Alice Shi Yi Gan Chee Lip School of Materials Science and Engineering CLGan@ntu.edu.sg Engineering::Materials::Ceramic materials The effects of porosity in ceramic composites, including zirconia and alumina-reinforced material, on its properties was examined in this study. Using the sacrificial template approach, the content of phenolic microballoon was adjusted to make dense and porous Alumina toughened zirconia (ATZ) ceramic. ATZ ceramics of 0, 30, 50, 70, 80, and 90 vol% porosities were produced and sintered for 2 hours at 1510°C. Archimedes principle, scanning electron microscopy, and X-ray diffraction were used to analyse the density and microstructure of the sintered alumina-zirconia ceramics. The flexural modulus, flexural strength, and dielectric characteristics were also characterized. According to the findings, when the porosity of the ceramic increases, its relative density decreases. After sintering, the microstructure revealed Al2O3 platelets ranging from 4 - 26 μm well scattered in the ZrO2 matrix, which had an average grain size of 0.57 μm. Tetragonal and monoclinic ZrO2 and α-Al2O3 were the crystalline phases found in the composites. The increase in porosity of the ATZ ceramic results in a significant drop in the sintered ceramics' flexural modulus (201 GPa to 0.16 GPa) and flexural strength (679 MPa to 0.86 MPa). The acquired results were confirmed and fitted with the Ashby-Gibson model. Because the Al2O3 reinforcement serves as a toughening agent in the ZrO2 matrix owing to crack deflection and changes in microstructural morphologies, ATZ ceramic has greater mechanical capabilities than standard zirconia ceramics. At 1000Hz, dense ATZ ceramic can have a relative dielectric constant of up to 34. Bachelor of Engineering (Materials Engineering) 2022-04-22T13:32:24Z 2022-04-22T13:32:24Z 2022 Final Year Project (FYP) Tan, A. S. Y. (2022). Fabrication of lightweight and ultrahigh strength close-cell ceramic foams through sacrificial template method. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/156798 https://hdl.handle.net/10356/156798 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::Materials::Ceramic materials
spellingShingle Engineering::Materials::Ceramic materials
Tan, Alice Shi Yi
Fabrication of lightweight and ultrahigh strength close-cell ceramic foams through sacrificial template method
description The effects of porosity in ceramic composites, including zirconia and alumina-reinforced material, on its properties was examined in this study. Using the sacrificial template approach, the content of phenolic microballoon was adjusted to make dense and porous Alumina toughened zirconia (ATZ) ceramic. ATZ ceramics of 0, 30, 50, 70, 80, and 90 vol% porosities were produced and sintered for 2 hours at 1510°C. Archimedes principle, scanning electron microscopy, and X-ray diffraction were used to analyse the density and microstructure of the sintered alumina-zirconia ceramics. The flexural modulus, flexural strength, and dielectric characteristics were also characterized. According to the findings, when the porosity of the ceramic increases, its relative density decreases. After sintering, the microstructure revealed Al2O3 platelets ranging from 4 - 26 μm well scattered in the ZrO2 matrix, which had an average grain size of 0.57 μm. Tetragonal and monoclinic ZrO2 and α-Al2O3 were the crystalline phases found in the composites. The increase in porosity of the ATZ ceramic results in a significant drop in the sintered ceramics' flexural modulus (201 GPa to 0.16 GPa) and flexural strength (679 MPa to 0.86 MPa). The acquired results were confirmed and fitted with the Ashby-Gibson model. Because the Al2O3 reinforcement serves as a toughening agent in the ZrO2 matrix owing to crack deflection and changes in microstructural morphologies, ATZ ceramic has greater mechanical capabilities than standard zirconia ceramics. At 1000Hz, dense ATZ ceramic can have a relative dielectric constant of up to 34.
author2 Gan Chee Lip
author_facet Gan Chee Lip
Tan, Alice Shi Yi
format Final Year Project
author Tan, Alice Shi Yi
author_sort Tan, Alice Shi Yi
title Fabrication of lightweight and ultrahigh strength close-cell ceramic foams through sacrificial template method
title_short Fabrication of lightweight and ultrahigh strength close-cell ceramic foams through sacrificial template method
title_full Fabrication of lightweight and ultrahigh strength close-cell ceramic foams through sacrificial template method
title_fullStr Fabrication of lightweight and ultrahigh strength close-cell ceramic foams through sacrificial template method
title_full_unstemmed Fabrication of lightweight and ultrahigh strength close-cell ceramic foams through sacrificial template method
title_sort fabrication of lightweight and ultrahigh strength close-cell ceramic foams through sacrificial template method
publisher Nanyang Technological University
publishDate 2022
url https://hdl.handle.net/10356/156798
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