Scientific Journal Problems of Emergency Situations - O. Savvova, Y. Pokroeva, H. Voronov, O. Fesenko, O. Khrystych, V. Deineka. Development of protective wear resistant transparent glass-ceramic coating for porcelain tiles. P. 198-208.

A protective wear-resistant transparent glass-ceramic coating has been developed for porcelain stoneware tiles using domestic raw materials under high-speed firing conditions. Achievement of high wear resistance, mechanical strength and transparency of glass-ceramic coatings was realized due to the provision of a high-strength structure of glass material with the formation of nanosized and submicron crystals transparent in the visible part of the spectrum in the bulk of the material and micro-sized crystals with high hardness on the coating surface during crystallization of the amorphous phase of a certain chemical composition. The presence in the composition of the main components, wt. %: SiO₂–51,9; Al₂O₃ 20,1; CaO–12,6 and ZnO and CeO₂as crystallization catalysts in a total amount of 4,0 wt. % allows in the near-surface layers of the coating with a roughness of ≈3 μm to form a crystalline phase −α-corundum in order to ensure wear resistance and easy-cleaning effect, as well as to ensure the crystallization of anorthite in the volume of the coating with a crystal size of <0,4 μm for the formation of a high-strength transparent structure. The formation of a sitalized structure of a glass-ceramic coating with a silky surface texture ensures high performance properties (EN ISO 10545): water absorption 0.07 %; ultimate bending strength, 58.97 N/mm²; wear resistance grade 4 (2100 revolutions), thermal resistance (T = 20–150–20 ºС) 10 cycles; resistance to cracking (T = 160 ºC, P = 500 kPa, 2 hours) more than two cycles; frost resistance (from 25 to –5 ºC) more than 100 cycles; chemical resistance classes GLA, GHA, GA; stain resistance class 5; sliding friction, PTV for dry surfaces − 59; for a damp surface − 29. The industrial production of ceramic granite tiles with a wear-resistant transparent glass-crystalline coating at PJSC "KhPZ" makes it possible to bring modern domestic manufacturers of ceramic products to a new competitive level.

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