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Title:	Features of the formation of low-melting non transparent glassy coatings
Authors:	Levitskii, Ivan
Keywords:	glaze coatings crystalline phase whiteness
Issue Date:	2019
Citation:	Levitskii, I. Features of the formation of low-melting non transparent glassy coatings / I. Levitskii // Sіsесам international glass conference : combined with 34th Sisecam glass symposium, 21-22 november 2019. – p. 191
Description:	Glaze coatings are synthesized in the Na2O-K2O-CaO-ZnO-AI2O3-B2O3-ZrO2-SiO2 system with the content of components, wt. %: Si02 55.0-59.0; B2O3 12.0-16.0; ZnO 4.0-8.0. The remaining oxides were introduced in amount, wt.%: R2O (Na2O + K2O) 8.0; CaO 5.0; AI2O3 6.0; ZrO2 6.0. The variation step was 1.0%. The frits were synthesized in a gas furnace at 1420-1450 ° C for 6 h. Transparent homogeneous frits were formed in the studied system, the crystallization of which established the formation of a crystallization film in the temperature range 610-670 ° C. The melting temperature of granules is 900-950° C. Using differential thermal analysis, the presence of an endo-effect at 610-690° C, associated with the point of softening of glasses, was established. At 950-995 ° C, an exo-effect due to crystallization processes is observed. The glaze slurry was prepared by grinding the frits to a residue on a № 0056 sieve (10858 holes / cm2) with the addition of 10 wt.% refractory clay. Glaze suspension was sprayed on the surface of ceramics. The coatings were fired in the temperature range 950-1100 ° C in an electric chamber furnace. Coatings are non-transparent and characterized by high levels of whiteness. The main crystalline phase in the coatings is zircon (ZrSiO4). The shine of the coating was 55-80%, whiteness 60-85%. The temperature coefficient of linear expansion of the coating was (50.3-53.2) 10-7 К -1. The thermal stability of the glaze compositions was in the range of 200-250 ° C. The microhardness of the coatings was 6830-8120 MPa. It was established that highquality coatings are formed when the content of oxides like ZnO and ZrO2 is in the amount of 10-14 wt.% with the ratio of glass-forming oxides (SiO2 + AI2O3) / (Na20 + K2O) of 6.0-6.4. Studies have established the absence of migration of boron and aluminum ions into model media simulating food liquids.
URI:	https://elib.belstu.by/handle/123456789/32103
Appears in Collections:	Публикации в зарубежных изданиях

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