Cyclic contact loading of Y-TZP ceramics with spherical SSiC shape under ambient air and water-lubricated conditions.pdfVIP

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Cyclic contact loading of Y-TZP ceramics with spherical SSiC shape under ambient air and water-lubricated conditions.pdf

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Cyclic contact loading of Y-TZP ceramics with spherical SSiC shape under ambient air and water-lubricated conditions.pdf

G Model JECS-11024; No. of Pages 10 ARTICLE IN PRESS Journal of the European Ceramic Society xxx (2017) xxx–xxx Contents lists available at Journal of the European Ceramic Society journal homepage: /locate/jeurceramsoc Feature article Cyclic contact loading of Y-TZP ceramics with spherical SSiC shape under ambient air and water-lubricated conditions Christian Schr?der a,?, Tobias Kiemle b, Andreas Kailer a, Christoph Berthold b, Klaus G. Nickel b a Fraunhofer Institute for Mechanics of Materials IWM, Germany b Applied Mineralogy, University of Tübingen, Germany article info Article history: Received 29 August 2016 Received in revised form 10 January 2017 Accepted 12 January 2017 Available online xxx Keywords: Y-TZP Cyclic contact loading Phase transformation Raman-spectroscopy FIB milling abstract The in?uence of phase transformation toughening (PTT) on the surface damage behavior of 3 mol% yttria stabilized zirconia (Y-TZP) was studied by cyclic contact loading with spherical SiC indenter. Cyclic loadings were applied under ambient air and water lubrication, respectively, on two Y-TZPs differing in grain size and thus transformability of the tetragonal phase. In both materials, radial fretting and tribo-chemical wear were initiated at local spots within the micro-slip zone. Transformation into the monoclinic phase was found to occur adjacent to these surface damages dependent on the transformability of the plate material. While growth of damage incidences during repeated loading may be supported by transformation-induced micro-cracking the initiation of fatigue-induced cracking is suppressed by PTT and was therefore only observed in the ?ne grained ceramic. Generally, water acts as a lubricant and decreases the propagation of surface damages by reducing the surface shear stresses. ? 2017 Elsevier Ltd. All rights reserved. 1. Introduction The outstanding mechanical properties of yttria-stabilized tetragonal zirconia polycrystals (Y-TZP), particularly the fracture t