Gelation, Phase-Formation, and Sintering Processes in the Sol-Gel Method of Producing Aluminosilicate Glass-Ceramic Modified by Refractory Hafnium and Zirconium Oxides
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Glass-ceramic based on compositions in the system Sr(Ba)–Al2O3–SiO2, modified by additions of zirconium oxide ZrO2 and hafnium oxide HfO2 with and without yttrium as a stabilizer, was synthesized by the sol-gel method. It was shown that the introduction of refractory oxides shortens the gelation time of the initial solutions, intensifies the sintering of the glass-ceramic, and changes the temperature intervals of phase formation processes and the nature of the precipitated crystalline phases. The sol-gel method made it possible to obtain a uniform distribution of the modifier-oxide grains in the bulk of the glass-ceramic. The yttrium oxide in the structure of the materials is concentrated near ZrO2 and HfO2 particles.
Key wordsglass-ceramic strontium anorthite celsian SrO–Al2O3–SiO2 BaO–Al2O3–SiO2 sol-gel gelation crystallization sintering
This research was supported by an RSF grant (project No. 18-73-00325).
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