Study of Technological Features of Celsian Ceramics Creation

Every year there are more stringent requirements for ceramic materials used in the aerospace industry. Therefore, the creation of new ceramic materials based on the crystalline phase of Celsian is an urgent problem of modern materials science. The influence of technological parameters on the properties of celsian ceramics is investigated in the study. The synthesis of the Celsian phase was performed using technical raw materials: alumina, barium carbonate and quartz sand. A variable technological factor was exposure to a temperature of $1,350^{\circ}$ C for 2,4 and 6 hours. Structural and phase features of the obtained samples were studied by scanning electron microscopy and X-ray phase analysis. Regularities of change of physical and mechanical properties depending on duration of firing of experimental ceramics are proved. Moreover, it is proved that with increasing the firing time of the samples, the values of water absorption and open porosity decrease and the apparent density of celsian ceramics increases. The mechanical and dielectric properties of the experimental ceramics, the values of which are in the intervals $\varepsilon-8,7 \div 15,4; \sigma-115 \div 292 \mathrm{MPa}$, have been experimentally studied. According to the values of dielectric constant $(\varepsilon=8.7)$ only for exposures for 4 hours, the samples meet the requirements for radio-transparent materials.