Influence of zinc-containing compounds on the properties of ceramic materials based on the Li₂O–MgO–Al₂O₃–SiO₂ system

The results of a study the influence of magnesium oxide substitution with zinc oxide in the Li₂O–MgO– Al₂O₃–SiO₂ system, as well as the introduction of pre-synthesized ganite ZnAl₂O₄, on sintering, phase formation and thermal expansion of synthesized materials are presented. It was found that after substitution of 4 % magnesium oxide MgO with zinc oxide ZnO, the ceramic material synthesized at a temperature of 1 150 °C was characterized by higher values of apparent density (not less than 1 835 kg/m³), mechanical compressive strength (300 MPa), and heat resistance (more than 80 thermal cycles), as well as low values of LTEC (–0,25 ∙ 10^–6 K^–1), which is due to the formation of crystalline phases of spodumene, spinel, forsterite, corundum, ganite and quartz.

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