Effects of MgO addition on the phase, mechanical properties, and microstructure of zirconia-toughened alumina added with CeO2 (ZTA–CeO2) ceramic composite

The effects of MgO addition on properties such as density, firing shrinkage, microstructure, Vickers hardness, and fracture toughness of ZTA–CeO2 ceramics composites were investigated. The amount of CeO2 used in the experiment was fixed at 5.0 wt% while the MgO addition was varied from 0 wt% to 2.0...

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Main Authors:	Rejab, Nik Akmar, Ahmad Azhar, Ahmad Zahirani, Khoo, Seng Kian, Ratnam, Mani Maran, Ahmad, Zainal Arifin
Format:	Article
Language:	English English
Published:	Elsevier BV 2014
Subjects:	Q Science (General)
Online Access:	http://irep.iium.edu.my/33806/ http://irep.iium.edu.my/33806/ http://irep.iium.edu.my/33806/ http://irep.iium.edu.my/33806/1/1-s2.0-S0921509313013282-main.pdf http://irep.iium.edu.my/33806/4/33806_Effects%20of%20MgO%20addition%20on%20the%20phase_SCOPUS.pdf

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spelling	iium-338062017-09-19T02:28:20Z http://irep.iium.edu.my/33806/ Effects of MgO addition on the phase, mechanical properties, and microstructure of zirconia-toughened alumina added with CeO2 (ZTA–CeO2) ceramic composite Rejab, Nik Akmar Ahmad Azhar, Ahmad Zahirani Khoo, Seng Kian Ratnam, Mani Maran Ahmad, Zainal Arifin Q Science (General) The effects of MgO addition on properties such as density, firing shrinkage, microstructure, Vickers hardness, and fracture toughness of ZTA–CeO2 ceramics composites were investigated. The amount of CeO2 used in the experiment was fixed at 5.0 wt% while the MgO addition was varied from 0 wt% to 2.0 wt%. Each composition was weighed, mixed, and pressed using hydraulic press under 300 MPa into 13 mm pellets. The pellets were sintered at 1600 °C for 4 h under pressureless condition. Vickers hardness and fracture toughness of the sintered samples were measured using the Vickers indentation method. Based on the SEM microstructures, elongated secondary phase, i.e. MgAl11CeO19, started to occur at 0.5 wt% MgO. This elongated phase was responsible for the increase in fracture toughness of the ceramic composites. Similarly, the addition of more than 0.5 wt% MgO produced another secondary phase (MgAl2O4), as detected by XRD. This phase was shown to have low intrinsic fracture toughness. Therefore, the sample with 0.5 wt% MgO showed the optimum properties with the highest fracture toughness (9.14 View the MathML source) and Vickers hardness (1591 HV) values. Elsevier BV 2014-02-10 Article PeerReviewed application/pdf en http://irep.iium.edu.my/33806/1/1-s2.0-S0921509313013282-main.pdf application/pdf en http://irep.iium.edu.my/33806/4/33806_Effects%20of%20MgO%20addition%20on%20the%20phase_SCOPUS.pdf Rejab, Nik Akmar and Ahmad Azhar, Ahmad Zahirani and Khoo, Seng Kian and Ratnam, Mani Maran and Ahmad, Zainal Arifin (2014) Effects of MgO addition on the phase, mechanical properties, and microstructure of zirconia-toughened alumina added with CeO2 (ZTA–CeO2) ceramic composite. Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, 595. pp. 18-24. ISSN 0921-5093 http://www.sciencedirect.com/science/journal/09215093/595 DOI: 10.1016/j.msea.2013.11.091
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English English
topic	Q Science (General)
spellingShingle	Q Science (General) Rejab, Nik Akmar Ahmad Azhar, Ahmad Zahirani Khoo, Seng Kian Ratnam, Mani Maran Ahmad, Zainal Arifin Effects of MgO addition on the phase, mechanical properties, and microstructure of zirconia-toughened alumina added with CeO2 (ZTA–CeO2) ceramic composite
description	The effects of MgO addition on properties such as density, firing shrinkage, microstructure, Vickers hardness, and fracture toughness of ZTA–CeO2 ceramics composites were investigated. The amount of CeO2 used in the experiment was fixed at 5.0 wt% while the MgO addition was varied from 0 wt% to 2.0 wt%. Each composition was weighed, mixed, and pressed using hydraulic press under 300 MPa into 13 mm pellets. The pellets were sintered at 1600 °C for 4 h under pressureless condition. Vickers hardness and fracture toughness of the sintered samples were measured using the Vickers indentation method. Based on the SEM microstructures, elongated secondary phase, i.e. MgAl11CeO19, started to occur at 0.5 wt% MgO. This elongated phase was responsible for the increase in fracture toughness of the ceramic composites. Similarly, the addition of more than 0.5 wt% MgO produced another secondary phase (MgAl2O4), as detected by XRD. This phase was shown to have low intrinsic fracture toughness. Therefore, the sample with 0.5 wt% MgO showed the optimum properties with the highest fracture toughness (9.14 View the MathML source) and Vickers hardness (1591 HV) values.
format	Article
author	Rejab, Nik Akmar Ahmad Azhar, Ahmad Zahirani Khoo, Seng Kian Ratnam, Mani Maran Ahmad, Zainal Arifin
author_facet	Rejab, Nik Akmar Ahmad Azhar, Ahmad Zahirani Khoo, Seng Kian Ratnam, Mani Maran Ahmad, Zainal Arifin
author_sort	Rejab, Nik Akmar
title	Effects of MgO addition on the phase, mechanical properties, and microstructure of zirconia-toughened alumina added with CeO2 (ZTA–CeO2) ceramic composite
title_short	Effects of MgO addition on the phase, mechanical properties, and microstructure of zirconia-toughened alumina added with CeO2 (ZTA–CeO2) ceramic composite
title_full	Effects of MgO addition on the phase, mechanical properties, and microstructure of zirconia-toughened alumina added with CeO2 (ZTA–CeO2) ceramic composite
title_fullStr	Effects of MgO addition on the phase, mechanical properties, and microstructure of zirconia-toughened alumina added with CeO2 (ZTA–CeO2) ceramic composite
title_full_unstemmed	Effects of MgO addition on the phase, mechanical properties, and microstructure of zirconia-toughened alumina added with CeO2 (ZTA–CeO2) ceramic composite
title_sort	effects of mgo addition on the phase, mechanical properties, and microstructure of zirconia-toughened alumina added with ceo2 (zta–ceo2) ceramic composite
publisher	Elsevier BV
publishDate	2014
url	http://irep.iium.edu.my/33806/ http://irep.iium.edu.my/33806/ http://irep.iium.edu.my/33806/ http://irep.iium.edu.my/33806/1/1-s2.0-S0921509313013282-main.pdf http://irep.iium.edu.my/33806/4/33806_Effects%20of%20MgO%20addition%20on%20the%20phase_SCOPUS.pdf
first_indexed	2023-09-18T20:48:53Z
last_indexed	2023-09-18T20:48:53Z
_version_	1777409860824989696

Effects of MgO addition on the phase, mechanical properties, and microstructure of zirconia-toughened alumina added with CeO2 (ZTA–CeO2) ceramic composite

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