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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

Journal of Ceramic Science and Technology, Vol. 9, No. 1 (2018), pp. 7-18

DOI: 10.4416/JCST2017-00049

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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.

Keywords

Zirconia, phase composition, microstructure, mechanical properties

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