D. Mendeleev University of Chemical Technology of Russia, Moscow, Russia

M. O. Senina, Associate Professor at the Department of Chemical Technology of Ceramics and Refractories, Candidate of Technical Sciences, e-mail: senina.m.o@muctr.ru
A. R. Ketler, Master’s Student at the Department of Chemical Technology of Ceramics and Refractories
D. O. Lemeshev, Dean of the Faculty of Technology of Inorganic Substances and High-Temperature Materials, Candidate of Technical Sciences, Associate Professor
D. Yu. Zhukov, Director of Ekokhimproekt Technological Centre, Candidate of Technical Sciences, Associate Professor

This paper looks at the potential application of zirconium dioxide-based ceramics as a heat-resistant material in various areas. The authors looked at the factors affecting the thermal resistance of zirconia-based structural ceramics. Blanks were obtained by uniaxial double-action dry compacting of commercial powders of zirconium and titanium oxides. It was determined how the structure and thermal resistance of the produced materials is governed by the concentration of the stabilizer additive of titanium oxide in the form of rutile. The possibility of stabilizing zirconium dioxide with titanium dioxide is shown, avoiding the introduction of the classical ZrO₂ modifier — i. e. yttrium oxide. The authors also looked at the phases forming in the ZrO₂ – TiO₂ system. As the concentration of titanium dioxide in ceramics rose, an increased concentration of the solid solution of ZrTiO₄ was observed, with no free phases of zirconium and titanium dioxides present. At the same time, the thermal resistance also increased due to the compensation of the high linear expansion coefficient of the cubic phase of zirconium dioxide with its low value for the forming phase of zirconium titanate. The authors examined the relationship between the concentration of rutile and the stability of the tetragonal phase of zirconium dioxide at room temperature. This research study resulted in the production of ceramics with a typical microcrystalline fragmental structure beneficial for a refractory material. It was established that the addition of titanium oxide in concentrations exceeding 25 mol. % helps raise the thermal resistance of ceramics. Samples with 25–31 mol. % of titanium dioxide withstood three “1,200 ^oC — water” thermal cycles, whereas the sample with 23 mol. % of titanium dioxide did only one under the same conditions.
The research was carried out using the equipment of the D. I. Mendeleev Center for Collective Use within the framework of project No. 075-15-2021-688.

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