Lisyutkina M. Resource-efficient technology of chemically stable and heat-resistant ceramics based on system compositions (Mg, Са)O – Al2O3 – TiO2 – SiO2

The object of research is the processes of sintering, phase formation of chemically stable and heat-resistant ceramic materials in conjunction in interrelation with properties of finished products. Methods of analysis were used in this work: thermodynamic, chemical, X-ray diffraction, differential-thermal, optical and electron microscopic analyzes, mathematical statistics and experiment planning. A complete geometrical-topological characteristic of phase СаO – Al2O3 – TiO2 – SiO2 and MgO – Al2O3 – TiO2 – SiO2 systems is provided, and areas for low-temperature synthesis of tialite-based ceramics was selected. The ceramic masses and technological parameters of production that provide ceramics at a temperature of 1250 °С with a complex of functional properties are developed, as well as found that the complete replacement of costly technical alumina with man-made materials will contribute to reducing the cost of products. For the first time, the possibility of stabilizing the tialite at a reduced temperature firing of ceramic (1250 °C) due to the formation of solid solutions was proved, and the optimum ratio of MgO:TiO2 for the stabilization of the tialite phase was determined. The ways of realization of controlled phase formation of chemically stable and heat-resistant ceramics due to variation of TiO2/Al2O3 ratio are determined. One patent of Ukraine for a utility model was obtained, theoretical developments into the scientific process of NTU "KhPI" have been introduced and the testing of ceramics in experimental industrial conditions of Scientific-Production Enterprise "DOMINANTA" LLC was carried out. The results of the work in the chemical, construction, metallurgical, machine building and ceramic industries can be used, as well as higher education establishments in the training of specialists in the technology of refractory nonmetallic materials.