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  • 1.
    Adolfsson, Erik
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF, Keramer.
    Zirconia in applications with bone contact2016Conference paper (Other academic)
  • 2.
    Reveron, Helen
    et al.
    Université de Lyon-INSA de Lyon, France.
    Fornabaio, Marta
    Politecnico di Torino, Italy.
    Palmero, Paolo
    Politecnico di Torino, Italy.
    Fürderer, Tobias
    DOCERAM, MOESCHTER GROUP Holding GmbH & Co. KG, Germany.
    Adolfsson, Erik
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF, Keramer.
    Lughi, Vanni
    University of Trieste,Italy.
    Bonifacio, Alois
    University of Trieste, Italy.
    Sergo, Valter
    University of Trieste, Italy.
    Montanaro, Laura
    Politecnico di Torino, Italy.
    Chevalier, Jerome
    Université de Lyon-INSA de Lyon, France.
    Towards long lasting zirconia-based composites for dental implants: Transformation induced plasticity and its consequence on ceramic reliability2017In: Acta Biomaterialia, ISSN 17427061, Vol. 48, p. 423-432Article in journal (Refereed)
    Abstract [en]

    Zirconia-based composites were developed through an innovative processing route able to tune compositional and microstructural features very precisely. Fully-dense ceria-stabilized zirconia ceramics (84 vol% Ce-TZP) containing equiaxed alumina (8 vol%Al2O3) and elongated strontium hexa-aluminate (8 vol% SrAl12O19) second phases were obtained by conventional sintering. This work deals with the effect of the zirconia stabilization degree (CeO2 in the range 10.0–11.5 mol%) on the transformability and mechanical properties of Ce-TZP-Al2O3-SrAl12O19 materials. Vickers hardness, biaxial flexural strength and Single-edge V-notched beam tests revealed a strong influence of ceria content on the mechanical properties. Composites with 11.0 mol% CeO2 or above exhibited the classical behaviour of brittle ceramics, with no apparent plasticity and very low strain to failure. On the contrary, composites with 10.5 mol% CeO2 or less showed large transformation-induced plasticity and almost no dispersion in strength data. Materials with 10.5 mol% of ceria showed the highest values in terms of biaxial bending strength (up to 1.1 GPa) and fracture toughness (>10 MPa√m). In these ceramics, as zirconia transformation precedes failure, the Weibull modulus was exceptionally high and reached a value of 60, which is in the range typically reported for metals. The results achieved demonstrate the high potential of using these new strong, tough and stable zirconia-based composites in structural biomedical applications. Statement of Significance Yttria-stabilized (Y-TZP) zirconia ceramics are increasingly used for developing metal-free restorations and dental implants. Despite their success related to their excellent mechanical resistance, Y-TZP can undergo Low Temperature Degradation which could be responsible for restoration damage or even worst the failure of the implant. Current research is focusing on strategies to improve the LTD resistance of Y-TZP or to develop alternative composites with better stability in vivo. In this work the mechanical characterization of a new type of very-stable zirconia-based composites is presented. These materials are composed of ceria-stabilized zirconia (84 vol%Ce-TZP) containing two second phases (α-alumina and strontium hexa-aluminate) and exhibit exceptional strength, toughness and ductility, which may allow the processing of dental implants with a perfect reliability and longer lifetime.

  • 3.
    Venturini, F
    et al.
    Zurich University of Applied Sciences, Switzerland.
    Schönherr, V
    Zurich University of Applied Sciences, Switzerland.
    Rey, J. M.
    Zurich University of Applied Sciences, Switzerland.
    Adolfsson, Erik
    RISE - Research Institutes of Sweden, Swerea, Swerea IVF, Keramer.
    Characterization of strongly scattering nanoporous materials as miniaturized multipass cell for tunable diode laser absorption spectroscopy2017In: Applied Physics B: Lasers and Optics, ISSN 09462171, Vol. 123, no 4, article id 136Article in journal (Refereed)
    Abstract [en]

    Through the confinement of gas in nanoporous materials, it is possible to significantly increase the path length for light–gas interaction. This enables the observation of much stronger absorption features for the confined gas molecules. In this work, we systematically characterized a variety of disordered strongly scattering ZrO2 and Al2O3 nanoporous ceramic materials to exploit the potential of gas in scattering media absorption spectroscopy. As a result, we identified a material with an unprecedented performance in terms of optical path length enhancement. In ZrO2 with thicknesses above 6 mm, the path enhancement exceeds 1000. The results obtained with near-infrared absorption spectroscopy on oxygen were validated by time-of-flight measurements at 700 nm, thus demonstrating their robustness. Finally, we report quantitative oxygen concentration measurement using nanoporous materials as miniaturized random-scattering multipass cell with an extremely simple and low-cost setup.

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