High-temperature fracture behaviour of layered alumina ceramics with textured microstructure

0570518 - ÚFM 2024 RIV GB eng J - Journal Article
Schlacher, J. - Chlup, Zdeněk - Hofer, A. K. - Bermejo, R.
High-temperature fracture behaviour of layered alumina ceramics with textured microstructure.
Journal of the European Ceramic Society. Roč. 43, č. 7 (2023), s. 2917-2927. ISSN 0955-2219. E-ISSN 1873-619X
Institutional support: RVO:68081723
Keywords : Alumina * High-temperature properties * Laminate strategy * Residual stresses * Textured microstructure
OECD category: Ceramics
Impact factor: 5.7, year: 2022
Method of publishing: Open access
https://www.sciencedirect.com/science/article/pii/S0955221922009219?via%3Dihub

Mimicking the damage tolerance of biological materials such as nacre has been realised in textured layered alumina ceramics, showing improved reliability as well as fracture resistance at room temperature. In this work, the fracture behaviour of alumina ceramics with textured microstructure and laminates with embedded textured layers are investigated under uniaxial bending tests at elevated temperatures (up to 1200 °C). At temperatures higher than 800 °C monolithic textured alumina favours crack deflection along the basal grain boundaries, corresponding to the transition from brittle to more ductile behaviour. In the case of laminates, the loss of compressive residual stresses is counterbalanced by the textured microstructure, effective up to 1200 °C. This study demonstrates the potential of tailoring microstructure and architecture in ceramics to enhance damage tolerance within a wide range of temperatures.
Permanent Link: https://hdl.handle.net/11104/0341807