Residual stresses in alumina-zirconia laminates

David J. Green, Peter Z. Cai, Gary Lynn Messing

Research output: Contribution to journalArticle

93 Scopus citations

Abstract

Significant residual stresses can arise in hybrid ceramic laminates during the densification and cooling processing cycles. The densification stresses in alumina-zirconia laminates were calculated assuming the layers to be linear viscous with data obtained by cyclic loading dilatometry. These stresses placed the zirconia layers in biaxial tension and even at 1 MPa or less, they were sufficient to cause a type of linear cavitation damage. The methodology was also applied to asymmetric laminates, successfully predicting their observed curling behaviour. Thermal expansion mismatch stresses arise during cooling, again placing the zirconia layers in residual biaxial tension and leading to the formation of transverse (channelling) cracks. The stresses were calculated using both elastic and viscoelastic formulations and were confirmed with indentation measurements. Additions of alumina to the zirconia layers were effective in reducing both sources of residual stress and allowed crack formation during processing to be avoided. Residual stresses were also shown to improve mechanical performance.

Original languageEnglish (US)
Pages (from-to)2511-2517
Number of pages7
JournalJournal of the European Ceramic Society
Volume19
Issue number13-14
StatePublished - Oct 1 1999

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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