Development and characterisation of a Y2Ti2O7-based glass-ceramic as a potential oxidation protective coating for titanium suboxide (TiOx)

Fabiana D' Isanto, Federico Smeacetto, Hans-Peter Martin, Richard Sedlak, Maksym Lisnichuk, Andreas Chrysanthou, Milena Salvo

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Abstract

A silica-based glass-ceramic, with Y2Ti2O7 as the major crystalline phase, is designed, characterised and tested as an oxidation-protective coating for a titanium suboxide (TiOx) thermoelectric material at temperatures of up to 600 °C. The optimised sinter-crystallisation treatment temperatures are found to be 1300 °C and 855 °C for a duration of 30 min, and this treatment leads to a glass-ceramic with cubic Y2Ti2O7 and CaAl2Si2O8 as crystalline phases. An increase of ~270 °C in the dilatometric softening temperature is observed after devitrification of the parent glass, thus further extending its working temperature range.
Excellent adhesion of the glass-ceramic coating to the thermoelectric material is maintained after exposure to a temperature of 600 °C for 120 h under oxidising conditions, thus confirming the effectiveness of the T1 glass-ceramic in protecting the TiOx material.


Original languageEnglish
Pages (from-to)19774-19783
Number of pages10
JournalCeramics International
Volume47
Issue number14
Early online date3 Apr 2021
DOIs
Publication statusPublished - 15 Jul 2021

Keywords

  • Glass-ceramics
  • Oxidation protective coating
  • Titanium suboxides

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