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The purpose of this experiment was to prepare high-voltage porcelain ceramics as local raw materials. Density, water absorption, and volume shrinkage were determined according to the State standard (GOST 7025-91). A structural analysis was carried out using a scanning electron microscope, and an X-ray phase analysis was carried out on an Xpert PRO diffractometer. It was found, that in the initial state, ceramics consist of hexagonal (SiO 2 ) and a small amount of monoclinic phase. Above a temperature of 1150 °С they consist of hexagonal (SiO 2 ), an orthorhombic lattice, and also contain mullite (Al 2 Si 2 O 13 ).

Influence of temperature on structural-phase changes and physical properties of ceramics on the basis of aluminum oxide and silicon