| 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 AI20 3-Zr02 1aminated 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. |
