The effects of CeO2 addition on the physical and microstructural properties of ZTA-TiO2 ceramics composite

Ahmad Azhar, Ahmad Zahirani and Mohamad Shawal, Siti Hajar and Manshor, Hanisah and Mohd Ali, Afifah and Rejab, Nik Akmar and Chan Abdullah, Ezzat and Ahmad, Zainal Arifin (2019) The effects of CeO2 addition on the physical and microstructural properties of ZTA-TiO2 ceramics composite. Journal of Alloys and Compounds, 773. pp. 27-33. ISSN 0925-8388 E-ISSN 0925-8388

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Abstract

The effect of CeO2 addition ranging from 0 wt. % to 7 wt. % on phase, microstructural evolution, physical and mechanical properties of ZTA-3 wt. % TiO2 ceramic composite were investigated. The samples were prepared by solid-state mixing and sintered at 1600 °C for 1hr under pressureless condition. Samples were then characterized by XRD, SEM, densitometer and Vickers indentation method. Based on XRD analysis, m-ZrO2 began to diminish at 1 wt.% CeO2 while secondary phases, i.e. Ce0.7Zr0.3O2and Zr0.4Ti0.6O2 initiated at 3 wt.% CeO2 addition. SEM images showed finer grain sizes was produced upon increasing amount of CeO2 up to 5 wt.%, corresponding to higher average grain intercept (AGI) values. From the results obtained, the optimum amount of CeO2 addition was at 5 wt. % which yielded the highest bulk density (4.41 g/cm3), firing shrinkage (21.94%), hardness (1580.10HV) and fracture toughness (9.77 MPa m1/2). This is contributed by the grain refinement and the highest amount of secondary phases formed, especially Zr0.4Ti0.6O2. However, with an excessive addition of CeO2, i.e more than 5 wt.%, grain sizes enlarged and the amount of secondary phases reduced, which degraded the mechanical properties of ZTA-3 wt. % TiO2.

Item Type:	Article (Journal)
Additional Information:	6954/66556
Uncontrolled Keywords:	ZTA-TiO2 ceramic compositeCeO2Fracture toughnessVickers hardnessMicrostructure
Subjects:	Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General) > TA401 Materials of engineering and construction
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering Kulliyyah of Engineering > Department of Science
Depositing User:	Dr Ahmad Zahirani Ahmad Azhar
Date Deposited:	12 Oct 2018 09:02
Last Modified:	28 Jan 2019 11:22
URI:	http://irep.iium.edu.my/id/eprint/66556

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