@article{ZehbeMochalesRadziketal.2016,
  author    = {Zehbe, Rolf and Mochales, Carolina and Radzik, Daniela and Mueller, Wolf-Dieter and Fleck, Claudia},
  title     = {Electrophoretic deposition of multilayered (cubic and tetragonal stabilized) zirconia ceramics for adapted crack deflection},
  series = {Journal of the European Ceramic Society},
  volume    = {36},
  journal   = {Journal of the European Ceramic Society},
  publisher = {Elsevier},
  address   = {Oxford},
  issn      = {0955-2219},
  doi       = {10.1016/j.jeurceramsoc.2015.08.022},
  pages     = {357 -- 364},
  year      = {2016},
  abstract  = {The electrophoretic deposition process was used to produce multi-layered ceramics consisting of alternating layers of fully stabilized cubic zirconia and partially stabilized tetragonal zirconia to make use of their different mechanical behaviour, investigating the possibility to deflect advancing cracks at the interfaces of the different layers. This crack deflection is apparently impacted by a toughening mechanism only found in the tetragonal stabilized zirconia polymorph and is characterized by the stress induced transformation of the metastable tetragonal phase into the monoclinic one, which is accompanied by a volume increase resulting in a closing mechanism for advancing cracks. While improving the electrophoretic deposition process, we investigated the transformation toughening mechanism at the layer interfaces and their effect on crack propagation. Investigations involved a combination of different imaging methods, including light microscopy, white light interferometry, atomic force microscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy and Raman spectroscopy. (C) 2015 Elsevier Ltd. All rights reserved.},
  language  = {en}
}
@article{ZehbeMochalesRadziketal.2015,
  author    = {Zehbe, Rolf and Mochales, Carolina and Radzik, Daniela and Mueller, Wolf-Dieter and Fleck, Claudia},
  title     = {Electrophoretic deposition of multilayered (cubic and tetragonal stabilized) zirconia ceramics for adapted crack deflection},
  series = {Journal of the European Ceramic Society},
  volume    = {36},
  journal   = {Journal of the European Ceramic Society},
  number    = {2},
  publisher = {Elsevier},
  address   = {Oxford},
  issn      = {0955-2219},
  doi       = {10.1016/j.jeurceramsoc.2015.08.022},
  pages     = {357 -- 364},
  year      = {2015},
  abstract  = {The electrophoretic deposition process was used to produce multi-layered ceramics consisting of alternating layers of fully stabilized cubic zirconia and partially stabilized tetragonal zirconia to make use of their different mechanical behaviour, investigating the possibility to deflect advancing cracks at the interfaces of the different layers. This crack deflection is apparently impacted by a toughening mechanism only found in the tetragonal stabilized zirconia polymorph and is characterized by the stress induced transformation of the metastable tetragonal phase into the monoclinic one, which is accompanied by a volume increase resulting in a closing mechanism for advancing cracks. While improving the electrophoretic deposition process, we investigated the transformation toughening mechanism at the layer interfaces and their effect on crack propagation. Investigations involved a combination of different imaging methods, including light microscopy, white light interferometry, atomic force microscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy and Raman spectroscopy.},
  language  = {en}
}
@article{ZehbeZaslanskyMochalesetal.2016,
  author    = {Zehbe, Rolf and Zaslansky, Paul and Mochales, Carolina and Mueller, Wolf-Dieter and Fleck, Claudia},
  title     = {Synchrotron micro tomographic evaluation of multilayered zirconia ceramics-Volumetric effects after indentation},
  series = {Journal of the European Ceramic Society},
  volume    = {36},
  journal   = {Journal of the European Ceramic Society},
  publisher = {Elsevier},
  address   = {Oxford},
  issn      = {0955-2219},
  doi       = {10.1016/j.jeurceramsoc.2015.09.015},
  pages     = {171 -- 177},
  year      = {2016},
  abstract  = {Electrophoretic deposition was used to produce zirconia specimen consisting of alternating layers of fully stabilized cubic zirconia and partially stabilized tetragonal zirconia. In this configuration, the tetragonal stabilized zirconia layers can undergo transformation toughening upon mechanical induced stresses, while the cubic stabilized layers can act as confining element. To understand the volumetric changes due to transformation toughening in these layered materials after indentation, we used an advanced synchrotron-based X-ray mu CT setup and compared the results with surface sensitive methods like Raman spectroscopy, AFM and white light interferometry. The high spatial resolution and the adapted beam energy between the absorption edges of zirconia and yttria allowed discriminating between individual layers due to differences in their yttria content. Furthermore we were able to identify single indents and link volume changes to different physical effects in the different stabilized zirconia parts and visualize the three dimensional volume around only few micrometre sized indents. (C) 2015 Elsevier Ltd. All rights reserved.},
  language  = {en}
}