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Open AccessArticle

Yttria Ceria Co-Stabilized Zirconia Reinforced with Alumina and Strontium Hexaaluminate

Institute for Manufacturing Technologies of Ceramic Components and Composites (IFKB), University of Stuttgart, Allmandring 7b, D-70569 Stuttgart, Germany
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Appl. Sci. 2019, 9(4), 729; https://doi.org/10.3390/app9040729
Received: 29 January 2019 / Revised: 12 February 2019 / Accepted: 18 February 2019 / Published: 20 February 2019
(This article belongs to the Special Issue Ceramic Composites and Films)
Zirconia materials are frequently used in dental applications due to their excellent strength and their tooth-like aspect. Standard yttria stabilized zirconia (Y-TZP) ceramics suffer, however, from moderate toughness and vulnerability to low-temperature degradation. In this study, 1Y6Ce-TZP materials reinforced with different amounts of alumina and/or strontium hexaaluminate were manufactured by slip casting and pressureless sintering at different temperatures to assess their mechanical properties, microstructure, phase composition, and low-temperature degradation stability. Results show that these materials exhibit a high fracture resistance of 10–12 MPa√m, a bending strength between 700–950 MPa, and a Vickers hardness of 1100–1200 HV10. Strontium hexaaluminate (SA6) precipitates were formed in situ by reaction of alumina and strontium zirconate. Although crack deflection at SA6 platelets was clearly visible, a net toughening was not observed. Accelerated ageing tests at 134 °C/3 bar water vapor pressure showed best results for mixed alumina/SA6 reinforcements and a sintering temperature of 1500 °C. Mehl-Avrami-Johnson plots used to describe the ageing kinetics showed clear indications of different ageing mechanisms due to the introduction of the SA6 phase. View Full-Text
Keywords: co-stabilized zirconia; hexaaluminates; low temperature degradation; mechanical properties co-stabilized zirconia; hexaaluminates; low temperature degradation; mechanical properties
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MDPI and ACS Style

Gommeringer, A.; Nölle, L.; Kern, F.; Gadow, R. Yttria Ceria Co-Stabilized Zirconia Reinforced with Alumina and Strontium Hexaaluminate. Appl. Sci. 2019, 9, 729. https://doi.org/10.3390/app9040729

AMA Style

Gommeringer A, Nölle L, Kern F, Gadow R. Yttria Ceria Co-Stabilized Zirconia Reinforced with Alumina and Strontium Hexaaluminate. Applied Sciences. 2019; 9(4):729. https://doi.org/10.3390/app9040729

Chicago/Turabian Style

Gommeringer, Andrea; Nölle, Lennart; Kern, Frank; Gadow, Rainer. 2019. "Yttria Ceria Co-Stabilized Zirconia Reinforced with Alumina and Strontium Hexaaluminate" Appl. Sci. 9, no. 4: 729. https://doi.org/10.3390/app9040729

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