Improving contact damage resistance of spinel translucent ceramics through a multi-layer design

Research output: Contribution to journalArticleResearchpeer-review

Authors

  • Aliasghar Najafzadehkhoee
  • Ali Talimian
  • Daniel Drdlik
  • Karel Maca
  • Dušan Galusek

External Organisational units

  • Brno University of Technology
  • Joint Glass Centre of the IIC SAS
  • Alexander Dubček University of Trenčín

Abstract

The brittle response of transparent spinel ceramics to contact damage is limiting their application as an alternative to glasses and single crystals. In this work, we explore a strategy to enhance the contact damage resistance of spinel ceramics by embedding alumina layers in a multi-layer architecture. Crack initiation upon Hertzian indentation was investigated in MgAl2O4 – Al2O3 laminates and compared to their corresponding monoliths. Contact stresses during loading were analyzed using finite element simulations by considering the elastic properties of the layers and contact non-linearities. Results were analyzed using Weibull statistics. It was found that the effect of in-plane residual stresses on crack formation in the laminate depends on the disposition of the compressive spinel layers, either at the surface or embedded in the structure. Embedding alumina between spinel layers increased the load-bearing capability before crack initiation by ∼70 % compared to spinel, offering a promising approach to enhance contact damage resistance.

Details

Original languageEnglish
Article number117071
Number of pages9
JournalJournal of the European Ceramic Society
Volume45.2025
Issue number4
DOIs
Publication statusPublished - 13 Nov 2024