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Abstract
Laminated ceramic composites (LCCs) were made by stacking layers with specific compositions in a predetermined sequence to achieve desired physical or mechanical properties. In the present work, the aim was to optimize the different processing parameters for fabricating AI2O3-ZrO2 laminated composites. With this aim, composites with different layer thicknesses, starting from 2 mm and going down to 0.3 mm, were made by hot pressing. The different types of cracks originating in the composites were studied in detail and the reasons behind their formation were analyzed. The main reasons for crack formation were found to be: (i) different shrinkage in between the co-sintering layers due to their different sintering kinetics, (ii) thermal expansion mismatch and (iii) a tensile component of the residual stress in the layer under residual compression. Suitable remedial measures were taken to avoid the crack formation and a laminated composite with 15 layers of 0.3 mm thickness was fabricated.