Processing and properties of tape-cast alumina/zirconia laminates composites

Journal
Journal of the European Ceramic Society  
Volume
39
Issue
12
Start Page
3462
End Page
3465
Citation
Journal of the European Ceramic Society 12 (39): 3462-3465 (2019-09)
Publisher DOI
10.1016/j.jeurceramsoc.2019.03.034
Scopus ID
2-s2.0-85063278964
In the present work, laminar ceramic structures formed by layers of alumina and partially stabilized zirconia were fabricated by water-based tape casting. Rheological, physical and mechanical properties of slurries and laminates were evaluated. The laminates consisted of stacked alumina and zirconia green tapes produced by thermopressing. Pyrolysis was carried out at 450 °C and sintering at 1500 °C. The alumina/zirconia laminates were studied for a better understanding of the formation behavior and crack propagation at the laminate interface. The flexural strength values of laminates depend on the stress state on their surface. The laminates with the highest amount of zirconia layers presented low strength values (6.7 MPa), while the laminates with more alumina layers had a higher strength level (57.7 MPa). This is because these laminates have alumina layers on the surface which are in a state of residual compressive stress.