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Effect of titania addition on yttria-stabilised tetragonal zirconia ceramics sintered at high temperatures

Miao, Xigeng, Sun, Dan, Hoo, Pui Woon, Liu, Jianli , Hu, Yifei, & Chen, Yanming (2004) Effect of titania addition on yttria-stabilised tetragonal zirconia ceramics sintered at high temperatures. Ceramics International, 30(6), pp. 1041-1047.

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Abstract

In order to combine the mechanical properties of yttria-stabilised zirconia (ZrO2–3 mol% Y2O3; code Y–ZrO2) with the bioactivity of titania (TiO2), Y–ZrO2–TiO2 green compacts with 0–40 vol.% TiO2 were sintered at 1300, 1400, and 1500 degrees Celsius for 4 h, respectively. The microstructural features such as grains, pores, and phases were examined using scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy dispersive spectroscopy (EDX). The mechanical properties such as hardness and toughness were also determined using the methods of Vickers indentation and Knoop indentation. All the composites showed the major tetragonal Y–ZrO2 phase regardless of the content of the added TiO2. However, rutile TiO2 phase was obtained at 1300 degrees Celsius, whereas zirconium titanate (ZrTiO4) phase was found at 1400 and 1500 degrees Celsius. The Y–ZrO2–ZrTiO4 composites sintered at 1500 degrees Celsius showed relatively high hardness (860–1000 kg/mm2) and toughness(4.0–4.5MPam0.5), whereas the Y–ZrO2–TiO2 composites sintered at 1300 degrees Celsius had slightly lower hardness (720–950 kg/mm2) and fracture toughness (3.1–3.3MPam0.5).

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ID Code: 7122
Item Type: Journal Article
Additional Information: For more information, please refer to the journal’s website (see link) or contact the author. Author contact details: x.miao@qut.edu.au
Keywords: Sintering, Composites, Titania, Zirconia, Toughness
DOI: 10.1016/j.ceramint.2003.10.025
ISSN: 0272-8842
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300) > Biomaterials (090301)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2004 Elsevier
Deposited On: 20 Apr 2007
Last Modified: 29 Feb 2012 23:28

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