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Effects of Stabilizer Content and Sintering Conditions on Y-TZP Ceramics made from Stabilizer-Coated Nanopowders
F. Kern, H. Strumberger, R. Gadow
University of Stuttgart, Institute for Manufacturing Technologies of Ceramic Components and Composites, Allmandring 7B, D-70569 Stuttgart, Germany
received July 3, 2017, , accepted September 12, 2017
Vol. 9, No. 1, Pages 7-18 DOI: 10.4416/JCST2017-00049
Abstract
Yttria-stabilized zirconia Y-TZP according to the state of the art has become a commodity applied in mechanical engineering and biomedicine. Besides the high strength typical for Y-TZP, the improved damage tolerance and fatigue strength are beneficial for components exposed to cyclic stress. In this study, Y-TZP materials were produced by means of hot pressing of nanoscale powders coated with yttria via a wet chemical route. Stabilizer contents were varied from 2.6 – 3 mol% Y2O3; sintering was carried out between 1250 °C and 1450 °C and 50 MPa axial pressure for 1 h. Samples were characterized in respect of their microstructure, phase composition and mechanical properties. Hardness and strength rise with stabilizer content and sintering temperature while fracture resistance showed a more complex dependence on composition and heat treatment parameters. Toughness in general declines from a comparable maximum level of 10 – 11 MPa√m at 1300 °C with rising sintering temperature, the decline is more pronounced for samples with high stabilizer content.
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Keywords
Zirconia, phase composition, microstructure, mechanical properties
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