Sol-Gel Synthesis of Nanosized Powders and Obtaining Ceramic Composites Based on Zircon and Zirconium Oxide
V. L. Ugolkova, *, N. A. Koval’chuka, A. V. Osipova, and L. P. Mezentsevaa
a Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, St. Petersburg, 199034 Russia
Correspondence to: *e-mail: ugolkov.52@mail.ru
Received 20 March, 2023
Abstract—Nanosized precursor powders of (1 – x)ZrSiO4‒xZrO(OH)2 are synthesized by the sol-gel method with the separate precipitation of components to obtain (1 – x)ZrSiO4‒xZrO2 ceramic composites. The thermal behavior of precursor powders is studied by differential scanning calorimetry and thermogravimetry (DSC/TG). Ceramic composites with a high level of microhardness are obtained by sintering powders, preliminarily calcined at 850°C, in air in the temperature range 1000‒1300°C. In the future, such ceramic composites can be used as matrices for solidification and isolating high-level waste (HLW).
Keywords: sol-gel synthesis, (1 – x)ZrSiO4‒xZrO2 ceramic composites, thermal analysis, Vickers microhardness
DOI: 10.1134/S1087659623600540