A procedure for designing innovative ceramic laminates with high mechanical performances is proposed in this work. A fracture mechanics approach has been considered to define the stacking sequence, thickness and composition of the different laminae on the basis of the requested strength and of the defect size distribution. Once the different laminae are stacked together a residual stress profile is generated upon cooling after sintering because of the differential thermal expansion coefficient. Such residual stress profile is conceived in order to allow stable growth of surface defects upon bending and guarantee limited strength scatter. As an example, the proposed approach is then used to design and produce a ceramic laminate in the alumina-mullite system.
Ceramic Laminates with High Mechanical Reliability by Design
Sglavo, Vincenzo Maria;
2005-01-01
Abstract
A procedure for designing innovative ceramic laminates with high mechanical performances is proposed in this work. A fracture mechanics approach has been considered to define the stacking sequence, thickness and composition of the different laminae on the basis of the requested strength and of the defect size distribution. Once the different laminae are stacked together a residual stress profile is generated upon cooling after sintering because of the differential thermal expansion coefficient. Such residual stress profile is conceived in order to allow stable growth of surface defects upon bending and guarantee limited strength scatter. As an example, the proposed approach is then used to design and produce a ceramic laminate in the alumina-mullite system.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione
