Stability of Nanocrystalline Spark Plasma Sintered 3Y-TZP |
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| Authors: | Ravikiran Chintapalli Alvaro Mestra Fernando García Marro Haixue Yan Michael Reece Marc Anglada |
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| Affiliation: | 1.Center for Structural Integrity and Reliability of Materials, Department of Materials Science and Metallurgical Engineering, Universitat Politècnica de Catalunya, Av. Diagonal 647, 08028 Barcelona, Spain; E-Mails: (A.M.); (F.G.M.);2.School of Engineering and Materials Science, Queen Mary College, University of London, Mile End Road, London E1 4NS, UK; E-Mails: (H.Y.); (M.R.);3.Nanoforce Technology Ltd, Mile End Rd, London E1 4NS, UK |
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| Abstract: | Spark plasma sintered 3Y-TZP has been investigated with respect to hydrothermal ageing and grinding. The sintering was performed between the temperatures of 1,100 and 1,600 °C for a soaking time of 5 minutes and the resulting materials were obtained with grain sizes between 65 to 800 nm and relative densities between 88.5 to 98.8%. Experiments on hydrothermal ageing in water vapour at 131 °C, 2 bars during 60 hours shows that phase stability is retained, elastic modulus and hardness of near surface region measured by nanoindentation does not change in fine grain (<200 nm) materials, in spite of porosity. In ground specimens, very small amount of transformation was found for all grain sizes studied. |
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| Keywords: | 3Y-TZP grain size degradation phase transformation |
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