Archivio Istituzionale della RicercaA 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-crystallization 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.
Development and characterisation of a Y2Ti2O7-based glass-ceramic as a potential oxidation protective coating for titanium suboxide (TiOx) / D’Isanto, Fabiana; Smeacetto, Federico; Martin, Hans-Peter; Sedlák, Richard; Lisnichuk, Maksym; Chrysanthou, Andreas; Salvo, Milena. - In: CERAMICS INTERNATIONAL. - ISSN 0272-8842. - 47:14(2021), pp. 19774-19783. [10.1016/j.ceramint.2021.03.316]
Development and characterisation of a Y2Ti2O7-based glass-ceramic as a potential oxidation protective coating for titanium suboxide (TiOx)
D’Isanto, Fabiana;Smeacetto, Federico;Salvo, Milena
2021
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-crystallization 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.
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CERI-D-21-00515_R1 post review.pdf
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https://hdl.handle.net/11583/2885416