Viscous flow spark plasma sintering of glass microspheres with YAG composition and high tendency to crystallization

Present work is focused on the preparation of bulk glass with stoichiometric yttrium aluminium garnet (YAG) composition, which has high tendency to crystallize. Glass microspheres were prepared by flame synthesis from sol-gel prepared YAG precursor. Sintering conditions in SPS apparatus such as heat...

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Published inJournal of the European Ceramic Society Vol. 41; no. 2; pp. 1537 - 1542
Main Authors Michálková, Monika, Kraxner, Jozef, Parchovianský, Milan, Klement, Róbert, Pouchlý, Václav, Maca, Karel, Galusek, Dušan
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.02.2021
Subjects
Flame synthesis
Glass
Glass-ceramic
Microspheres
SPS
YAG
Flame synthesis
Microspheres
Glass-ceramic
YAG
Glass
SPS
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Summary:Present work is focused on the preparation of bulk glass with stoichiometric yttrium aluminium garnet (YAG) composition, which has high tendency to crystallize. Glass microspheres were prepared by flame synthesis from sol-gel prepared YAG precursor. Sintering conditions in SPS apparatus such as heating rate, pressure and temperature were optimized with the aim to prepare transparent material. Results revealed that glass with high tendency to crystallize is very sensitive to time of densification under load (associated with the maximum applied temperature). The increase of the pressure led to the expansion of the translucent part of the sample. Dense, and slightly translucent amorphous samples (total transmission measured at 550 nm was 4.8 %) were successfully prepared by viscous flow SPS sintering of glass microspheres at temperatures below 910 °C without any isothermal dwell.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2020.10.015