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2.75Yb-TZP Ceramics with High Strength and Aging Resistance
F. Kern
University of Stuttgart, Institute for Manufacturing Technologies of Ceramic Components and Composites, 70569 Stuttgart, Allmandring 7 b, Germany
received 13 May, 2011, received in revised form 27 June, 2011, accepted 4 July, 2011
Vol. 2, No. 3, Pages 147-154 DOI: 10.4416/JCST2011-00020
Abstract
Tetragonal zirconia polycrystals (TZP) ceramics for biomedical applications such as hip, knee or dental implants require good mechanical properties (hardness, toughness and strength) as well as low-temperature degradation (LTD) resistance. State-of-the-art Y-TZP and Ce-TZP do, however, suffer from deficiencies with regard to one of these aspects.
Shifting to other rare earth stabilizers may help solve this problem. 2.75Yb-TZP powder doped with 0.5 vol% alumina was produced from pyrogenic nanopowder via the nitrate route. Samples were produced by means of hot pressing at 1200 – 1400 °C for 1 h at 60 MPa axial pressure. Mechanical properties, phase composition and microstructure were investigated. LTD behaviour was examined with an accelerated aging test in an autoclave at 134 °C in water vapour. 2.75Yb-TZP has very high strength and hardness as well as moderate toughness. Degradation in water vapour is slight in the time frame relevant for implants.
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Keywords
Zirconia, mechanical properties, microstructure, low-temperature degradation, ytterbia
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