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The Influence of Stabilizer Concentration on the Mechanical Properties of Alumina – 17 vol% Zirconia (0.6Y-2Y) Composites
F. Kern, S. Koummarasy, R. Gadow
University of Stuttgart, IFKB, Allmandring 7B, D-70569 Stuttgart Germany
received May 2, 2016, received in revised form May 10, 2016, accepted June 15, 2016
Vol. 7, No. 3, Pages 295-300 DOI: 10.4416/JCST2016-00034
Abstract
Zirconia-toughened alumina (ZTA) with a zirconia content close to the percolation threshold has become the state-of-the art ceramic material for hip implants. In this study the stabilizer content in a ZTA with 17 vol% zirconia was varied between 0.6 – 2 mol% Y2O3 to understand more about the influence of the stabilizer concentration on mechanical properties, phase composition and formation of residual stress. It was found that fracture resistance reaches its maximum close to the stress neutral state where transformation stresses equilibrate residual cooling stresses while compressive stress in the alumina matrix favors higher strength.
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Keywords
Ceramics, mechanical properties, zirconia, alumina, residual stress
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