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2.5Y-TZP from Yttria-Coated Pyrogenic Zirconia Nanopowder
Frank Kern
Institut für Fertigungstechnologie keramischer Bauteile, Universität Stuttgart, (Institute for Manufacturing Technologies of Ceramic Components and Composites, University of Stuttgart) D-70569 Stuttgart, Allmandring 7b
received March 16, 2010, received in revised form April 12, 2010, accepted April 16, 2010
Vol. 1, No. 1, Pages 21-26 DOI: 10.4416/JCST2010-00005
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.
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Keywords
zirconia, nanopowder, hot-pressing, powder coating, Y-TZP
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Copyright
© 2010 Göller Verlag
Acknowledgments
The help of IFKB staff in materials preparation and characterization is gratefully acknowledged.
