Determination of the prospects for the use of multicomponent composite ceramics as thermal barrier protective coatings

The paper presents the results of experiments aimed at identification of the influence of variations in thermal sintering conditions on the phase transformation processes in multicomponent ceramics based on oxide compounds of cerium, tellurium, bismuth, tungsten and zinc. According to the data obtained, it was established that with the annealing temperature growth above 1000 °C, the observed growth of zinc tungstate inclusions is due to the processes of recrystallization of the ZnTeO₃ and Bi₂WO₆ phases, which lead to the growth of grains of the ZnWO₄ phase and the formation of glass-like inclusions that have a reinforcing effect. During the studies conducted it was determined that the formation of inclusions in the form of zinc tungstate in the composition of multicomponent ceramics, caused by the thermal effect of sintering, leads to an increase in the resistance of ceramics to external influences, and also enhances resistance to high-temperature destruction and hydrogenation processes. An analysis of the thermal insulation characteristics of the studied ceramics showed that the dominance of zinc tungstate inclusions in the composition of the ceramics leads to increased resistance to both the processes of destruction caused by hydrogenation and thermal aging, the long-term impact of which leads to increased destabilization of the strength properties of the ceramics and deterioration of thermal insulation.