Spark Plasma Sintering was used to produce two engineered ceramic laminates in the SiC-Al2O3 system starting from tape casted composite layers. By changing the composition of the stacked laminae and the architecture of the laminate, tailored residual stress profile was produced after sintering and successive cooling. The laminates are sensible stronger than parent monolithic composite ceramic and show very limited strength variability which can be associated to the stable growth of surface defects before final failure as it is predicted by the apparent fracture toughness curve. Such shielding effect is also observed when macroscopic cracks are introduced by high load Vickers indentation. © 2011 Published by Elsevier Ltd.
High Strength Engineered Alumina-Silicon Carbide Laminated Composites by Spark Plasma Sintering
De Genua, Francesca;Sglavo, Vincenzo Maria
2011-01-01
Abstract
Spark Plasma Sintering was used to produce two engineered ceramic laminates in the SiC-Al2O3 system starting from tape casted composite layers. By changing the composition of the stacked laminae and the architecture of the laminate, tailored residual stress profile was produced after sintering and successive cooling. The laminates are sensible stronger than parent monolithic composite ceramic and show very limited strength variability which can be associated to the stable growth of surface defects before final failure as it is predicted by the apparent fracture toughness curve. Such shielding effect is also observed when macroscopic cracks are introduced by high load Vickers indentation. © 2011 Published by Elsevier Ltd.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione
