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Open AccessArticle

Processing and Properties of Zirconia-Toughened Alumina Prepared by Gelcasting

Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, Singapore 638075, Singapore
Biomedical Engineering, School of AMME J07, University of Sydney, Sydney 2006, Australia
Author to whom correspondence should be addressed.
Academic Editor: Juergen Stampfl
Materials 2015, 8(7), 4344-4362;
Received: 6 May 2015 / Revised: 10 July 2015 / Accepted: 10 July 2015 / Published: 16 July 2015
(This article belongs to the Special Issue Bioceramics)
Zirconia-toughened alumina (ZTA) using yttria-stabilised zirconia is a good option for ceramic-ceramic bearing couples for hip joint replacement. Gelcasting is a colloidal processing technique capable of producing complex products with a range of dimensions and materials by a relatively low-cost production process. Using gelcasting, ZTA samples were prepared, optimising the stages of fabrication, including slurry preparation with varying solid loadings, moulding and de-moulding, drying and sintering. Density, hardness, fracture toughness, flexural strength and grain size were observed relative to slurry solid loadings between 58 and 62 vol. %, as well as sintering temperatures of 1550 °C and 1650 °C. Optimal conditions found were plastic mould, 4000 g/mol PEG with 30 vol. % concentration, 61% solid loading and Ts = 1550 °C. ZTA samples of high density (maximum 99.1%), high hardness (maximum 1902 HV), high fracture toughness (maximum 5.43 MPa m1/2) and high flexural strength (maximum 618 MPa) were successfully prepared by gelcasting and pressureless sintering. View Full-Text
Keywords: gelcasting; ceramic; suspension; zirconia; alumina; osmotic; solid loading gelcasting; ceramic; suspension; zirconia; alumina; osmotic; solid loading
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Abbas, S.; Maleksaeedi, S.; Kolos, E.; Ruys, A.J. Processing and Properties of Zirconia-Toughened Alumina Prepared by Gelcasting. Materials 2015, 8, 4344-4362.

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