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Low-Temperature Degradation Behaviour and Mechanical Properties of a 3Y-TZP Manufactured from Detonation-Synthesized Powder

F. Kern, V. Lindner, R. Gadow

Journal of Ceramic Science and Technology, Vol. 7, No. 4 (2016), pp. 313-322

DOI: 10.4416/JCST2016-00036

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Abstract

In recent years, yttria-stabilized zirconia Y-TZP has attracted considerable interest in the field of dental restoration. However, the state-of-the-art Y-TZP materials made from coprecipitated powders only just comply with the current standard in terms of fracture resistance and grain size. In this study a new nanoscale starting powder produced with detonation synthesis was applied to produce a fully dense specimen by means of hot pressing in the sintering temperature range between 1250 – 1500 °C. Mechanical properties, microstructure and phase composition were studied. Low-temperature degradation behavior was quantified in an accelerated ageing test in a saturated water vapor at 134 °C. Between sintering temperatures of 1300 °C and1400 °C, the materials obtained show a combination of high strength > 1400 MPa, toughness of 6 MPa√m and fine grain size  90 % tetragonal phase up to ageing times of 10 h ≈ 35 years in vivo.

Keywords

Zirconia, mechanical properties, phase composition, microstructure, low-temperature degradation

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