Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite: the effects on microstructure and properties

This paper focuses on the development of a zirconia-toughened alumina ZTA-TiO2-Cr2O3 ceramic composite by means of microwave sintering at 2.45 GHz within the range 1200 °C–1400 °C, with a dwell time of 5–20 min. It is aimed at attaining improved microstructure and properties at a lower sintering tem...

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Main Authors:	Manshor, Hanisah, Abdullah, Ezzat Chan, Ahmad Azhar, Ahmad Zahirani, Yeo, Wee Sing, Ahmad, Zainal Arifin
Format:	Article
Language:	English English English
Published:	Elsevier 2017
Subjects:	QC Physics
Online Access:	http://irep.iium.edu.my/59420/ http://irep.iium.edu.my/59420/ http://irep.iium.edu.my/59420/ http://irep.iium.edu.my/59420/1/59420_Microwave%20sintering%20of%20zirconia-toughened.pdf http://irep.iium.edu.my/59420/2/59420_Microwave%20sintering%20of%20zirconia-toughened_SCOPUS.pdf http://irep.iium.edu.my/59420/7/59420_Microwave%20sintering%20of%20zirconia-toughened_WOS.pdf

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recordtype	eprints
spelling	iium-594202017-11-17T02:42:40Z http://irep.iium.edu.my/59420/ Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite: the effects on microstructure and properties Manshor, Hanisah Abdullah, Ezzat Chan Ahmad Azhar, Ahmad Zahirani Yeo, Wee Sing Ahmad, Zainal Arifin QC Physics This paper focuses on the development of a zirconia-toughened alumina ZTA-TiO2-Cr2O3 ceramic composite by means of microwave sintering at 2.45 GHz within the range 1200 °C–1400 °C, with a dwell time of 5–20 min. It is aimed at attaining improved microstructure and properties at a lower sintering temperature and shorter soaking time, compared to using a conventional heating method. Consequently, the effects of sintering temperature and soaking time on densification, properties and microstructural behaviour of the composite, are investigated. XRD analysis reveals that the microwave-sintered samples possess a higher crystallinity at a higher sintering temperature. Microstructural analysis confirms the uniform distribution of particles and controlled grain growth; with the lowest AGI value being 1.28 grains/μm. The sample that is microwave-sintered at 1350 °C with 10 min of soaking time achieves a high density (95.74% of the theoretical density), elevated hardness (1803.4 HV), and excellent fracture toughness (9.61 MPa m1/2), and intergranular cracks. This proves that the microwave sintering technique enhances densification, microstructural evolution and the properties of the ceramic composite at a lower temperature and shorter soaking time, compared to conventional heating. Overall, the improved mechanical properties of the microwave-sintered ceramics, compared to conventionally-sintered ceramics, are attributed to the enhanced densification and finer and more homogeneous microstructure that is achieved through the use of a microwave sintering method. The results reveal that microwave sintering is effective in improving the microstructure and density of materials, and will be useful for enhancing the mechanical properties of ZTA-TiO2-Cr2O3 ceramic composites. Elsevier 2017-10-25 Article PeerReviewed application/pdf en http://irep.iium.edu.my/59420/1/59420_Microwave%20sintering%20of%20zirconia-toughened.pdf application/pdf en http://irep.iium.edu.my/59420/2/59420_Microwave%20sintering%20of%20zirconia-toughened_SCOPUS.pdf application/pdf en http://irep.iium.edu.my/59420/7/59420_Microwave%20sintering%20of%20zirconia-toughened_WOS.pdf Manshor, Hanisah and Abdullah, Ezzat Chan and Ahmad Azhar, Ahmad Zahirani and Yeo, Wee Sing and Ahmad, Zainal Arifin (2017) Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite: the effects on microstructure and properties. Journal of Alloys and Compounds, 722. pp. 458-466. ISSN 0925-8388 http://www.sciencedirect.com/science/article/pii/S092583881732114X 10.1016/j.jallcom.2017.06.115
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English English English
topic	QC Physics
spellingShingle	QC Physics Manshor, Hanisah Abdullah, Ezzat Chan Ahmad Azhar, Ahmad Zahirani Yeo, Wee Sing Ahmad, Zainal Arifin Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite: the effects on microstructure and properties
description	This paper focuses on the development of a zirconia-toughened alumina ZTA-TiO2-Cr2O3 ceramic composite by means of microwave sintering at 2.45 GHz within the range 1200 °C–1400 °C, with a dwell time of 5–20 min. It is aimed at attaining improved microstructure and properties at a lower sintering temperature and shorter soaking time, compared to using a conventional heating method. Consequently, the effects of sintering temperature and soaking time on densification, properties and microstructural behaviour of the composite, are investigated. XRD analysis reveals that the microwave-sintered samples possess a higher crystallinity at a higher sintering temperature. Microstructural analysis confirms the uniform distribution of particles and controlled grain growth; with the lowest AGI value being 1.28 grains/μm. The sample that is microwave-sintered at 1350 °C with 10 min of soaking time achieves a high density (95.74% of the theoretical density), elevated hardness (1803.4 HV), and excellent fracture toughness (9.61 MPa m1/2), and intergranular cracks. This proves that the microwave sintering technique enhances densification, microstructural evolution and the properties of the ceramic composite at a lower temperature and shorter soaking time, compared to conventional heating. Overall, the improved mechanical properties of the microwave-sintered ceramics, compared to conventionally-sintered ceramics, are attributed to the enhanced densification and finer and more homogeneous microstructure that is achieved through the use of a microwave sintering method. The results reveal that microwave sintering is effective in improving the microstructure and density of materials, and will be useful for enhancing the mechanical properties of ZTA-TiO2-Cr2O3 ceramic composites.
format	Article
author	Manshor, Hanisah Abdullah, Ezzat Chan Ahmad Azhar, Ahmad Zahirani Yeo, Wee Sing Ahmad, Zainal Arifin
author_facet	Manshor, Hanisah Abdullah, Ezzat Chan Ahmad Azhar, Ahmad Zahirani Yeo, Wee Sing Ahmad, Zainal Arifin
author_sort	Manshor, Hanisah
title	Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite: the effects on microstructure and properties
title_short	Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite: the effects on microstructure and properties
title_full	Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite: the effects on microstructure and properties
title_fullStr	Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite: the effects on microstructure and properties
title_full_unstemmed	Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite: the effects on microstructure and properties
title_sort	microwave sintering of zirconia-toughened alumina (zta)-tio2-cr2o3 ceramic composite: the effects on microstructure and properties
publisher	Elsevier
publishDate	2017
url	http://irep.iium.edu.my/59420/ http://irep.iium.edu.my/59420/ http://irep.iium.edu.my/59420/ http://irep.iium.edu.my/59420/1/59420_Microwave%20sintering%20of%20zirconia-toughened.pdf http://irep.iium.edu.my/59420/2/59420_Microwave%20sintering%20of%20zirconia-toughened_SCOPUS.pdf http://irep.iium.edu.my/59420/7/59420_Microwave%20sintering%20of%20zirconia-toughened_WOS.pdf
first_indexed	2023-09-18T21:24:12Z
last_indexed	2023-09-18T21:24:12Z
_version_	1777412082166136832

Microwave sintering of zirconia-toughened alumina (ZTA)-TiO2-Cr2O3 ceramic composite: the effects on microstructure and properties

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