Mineralogical and microstructural changes in fused cast Ti-stabilized alumina-zirconia eutectic ceramics at elevated temperatures
- Author(s)
- Annalena Erlacher, Adrian Villalba Weinberg, Christian Leopold Lengauer, Andreas Börger
- Abstract
Ti-stabilized alumina-zirconia eutectic ceramics produced by
fusion-casting are characterized to investigate microstructural
mechanisms at elevated temperatures and to explain the self-sharpening
effect. Scanning electron microscopy (SEM) images show fine-grained
lamellar eutectic microstructures with well-defined domains. After
thermal annealing at 800 °C, distinct cracks formed along the domain
boundaries. Thermal analyses and powder X-ray diffraction (pXRD), using
Rietveld evaluation, confirmed that the cracks are triggered by the
phase transformation from meta-stable tetragonal to monoclinic ZrO2,
causing a volume increase of up to 13.4 %. This indicates a decrease in
the stabilizing effect of Ti in the meta-stable tetragonal ZrO2
starting from 669 °C, and subsequently triggering the phase
transformation. Additionally, structural analysis of pXRD data reveals
internal stresses within the crystal lattice, showing expansion of
tetragonal ZrO2 along the c-axis and distortions in the basal plane in both tetragonal and monoclinic ZrO2.
- Organisation(s)
- Department of Mineralogy and Crystallography
- External organisation(s)
- Imerys Technology Center Austria
- Journal
- Open Ceramics
- Volume
- 22
- Pages
- 1-8
- No. of pages
- 8
- ISSN
- 2666-5395
- DOI
- https://doi.org/10.1016/j.oceram.2025.100798
- Publication date
- 06-2025
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 105116 Mineralogy, 105113 Crystallography
- Keywords
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/019f3d1e-d7c8-4f67-a493-6e1fa46cb010