TY - JOUR

T1 - High-temperature fracture behaviour of layered alumina ceramics with textured microstructure

AU - Schlacher, Josef Christian

AU - Chlup, Zdeněk

AU - Hofer, Anna-Katharina

AU - Bermejo, Raul

N1 - Publisher Copyright: © 2022 The Authors

PY - 2023/7

Y1 - 2023/7

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85142727265&partnerID=8YFLogxK

U2 - 10.1016/j.jeurceramsoc.2022.11.046

DO - 10.1016/j.jeurceramsoc.2022.11.046

M3 - Article

VL - 43.2023

SP - 2917

EP - 2927

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

SN - 0955-2219

IS - 7

ER -