Geometry Effect on the Thermal Shock Response of Al2O3/ZrO2 Multilayered Ceramics
In this work, the geometry effect on the thermal shock behaviour of a nine layered Al2O3- 5%tZrO2/Al2O3-30%mZrO2 ceramic fabricated by slip casting has been studied. A finite element model has been used to estimate the magnitude and location of the maximum thermal stresses in the layered material as well as the influence of the variation of this layered architectural design in the thermal shock crack initiation and extend throughout the specimens of study. Experimental tests on various samples have been carried out to validate the model. The residual stress distribution profile in the laminate, due to the elastic mismatch of the different layers along with the zirconia phase transformation on the Al2O3-30%mZrO2 layers, conditions the thermal shock response of the material. It is demonstrated how the variation of the outer most layer thickness in the laminates modifies the stress state in the surface, affecting the thermal shock crack initiation.
Marc Anglada et al.
R. Bermejo et al., "Geometry Effect on the Thermal Shock Response of Al2O3/ZrO2 Multilayered Ceramics", Key Engineering Materials, Vol. 333, pp. 251-254, 2007