Influence of zirconia CeO

Adriano Krajewski, Antonio Ravaglioli, Mauro Mazzocchi, Martino Labanti, Teresa La Torretta, Giovanni Bezzi, Gianloris Minoccari

Research output: Contribution to journalArticle

Abstract

The aim of this research is to study in detail the behaviour of glassy bioactive coatings (Bioglazes®) on zirconia substrates with different stabilising agents. In the case of tetragonal Ce-PSZ, some phenomena arose by applying a glaze coating. The stabilising CeO2 undergoes to an -even partially reversible- autoredox process (CeO2-Ce2O 3), caused by migration of oxygen during the glazing process, (ZrO2 is known as a proton and oxygen radical conducer at high temperatures), with a macroscopic effect of a grey-green colouring of the Ce-PSZ substrate below the coated surface ("affected volume"). The migration of oxygen can assume an extent for which at the glazing temperature, about 1300°C, it is possible the chemical equilibrium shifts towards formation of Ce2O3. Grey-green is the own colour of Ce2O3. By eliminating the sealing action of the glaze towards atmosphere, oxygen can diffuse back inside Ce-PSZ lattice, recovering the chemical and thermodynamic equilibrium conditions with CeO2 and Ce2O3 and inducing a decolouring effect in the Ce-PSZ ceramic back to a light colour. The bioactive glass utilised to produce the coatings is a calcium-silicophosphatic one, coded AP40.
Original languageEnglish
Pages (from-to)121 - 131
Number of pages11
JournalCeramics - Silikaty
Volume47
Issue number4
Publication statusPublished - Dec 2003
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Ceramics and Composites
  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

Krajewski, A., Ravaglioli, A., Mazzocchi, M., Labanti, M., Torretta, T. L., Bezzi, G., & Minoccari, G. (2003). Influence of zirconia CeO. Ceramics - Silikaty, 47(4), 121 - 131.