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2.5Y-TZP from Yttria-Coated Pyrogenic Zirconia Nanopowder

Frank Kern

Journal of Ceramic Science and Technology, Vol. 1, No. 1 (2010), pp. 21-26

DOI: 10.4416/JCST2010-00005

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Abstract

Thanks to their high strength and toughness, yttria-stabilized zirconia polycrystals (Y-TZP) have become one of the most important structural ceramics for engineering and biomedical applications. In this study 2.5Y-TZP powder was produced from monoclinic pyrogenic nanopowder with a nitrate coating and calcination process. The powders were consolidated by hot pressing to obtain specimens for mechanical testing, phase analysis and microstructural investigation. Bending strength, toughness, microstructure and transformability of the nano-TZP were determined depending on sintering temperature in the range 1300-1500 °C. The materials produced showed a combination of high toughness (9-10 MPa·√m) and strength (1000-1200 MPa). While the toughness showed little variation with sintering temperature, the best strength was observed at low sintering temperatures with materials of extremely fine grain size.

Keywords

zirconia, nanopowder, hot-pressing, powder coating, Y-TZP

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