SU1447766A1 - Glaze - Google Patents

Abstract

The invention relates to restorative glaze formulations. The aim of the invention is to increase the chemical stability and ensure the restoration of the glaze. Dp this glaze contains, wt%: SiO 39.25- 42.01; A1aOz 0.02-0.04i 7.81-12.01; CaO 2.59-4.06i MgO 0.04-0.05, 4.22-6.01; PbO $ 25.00-37.05 CuO 4.94-6.81; BiiOj 2.33-4.16 j MoOj 0.70-0.90. The chemical resistance of HNO is 99.90-99.94%, to 1N. NaOH 98.30- 98.78%. 3 tab.

Description

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Od O)

1U

 The invention relates to compositions of glazes used for producing decorative coatings on art products from red clays, namely, restorative glazes.

The aim of the invention is to increase the chemical stability and ensure the restoration of the glaze.

The compositions of the proposed glaze are shown in Table 1.

Glaze is prepared from the mixture using a frit, as well as CuO, B1 (CO) s, MoOS.

Chemical and blend compositions Frit are given in table 2.

Glazes are prepared in wet grinding mills of periodic action by grinding the frits and constituent materials that are not subjected to fritting: CuO, B1 (O3) 5 and MoO3. Water is injected to a relative humidity of 45-50% and the grinding of the components is carried out to a residue on the No. 0063 grid in an amount of 0.5-0.7%. Glaze slurry at a density of 1.48-1.52 g / cm is applied to the surface of ceramic products that have passed through comfort firing at a temperature of 810-850 ° C, by dipping and spraying. The products covered with the glaze suspension are dried in the air and then burned in electric furnaces. The optimum firing temperature is 850-900 ° C with condensation at a maximum temperature of 1.5-2.0 hours. During the cooling process, in the temperature range 700-600 ° C, a reducing medium is created in the furnace by introducing technical rosin, fuel oil or heating oil into the furnace .

The proposed glaze has the properties presented in table 3.

Claims (1)

Invention Formula Glaze, including SiOa,,, CaO, MgO,, PbO, characterized in that, in order to improve chemical stability and ensure the restoration of glaze, it additionally contains CuO, .3, MoOZ in the following ratio of components, wt.%: , 25-42.01 A1aOz0,02-0,04 , 81-12,01 CaO2,59-4,06 3 1447766 Continuation of table 2 Continuation of table 2 Charge composition, g per 100 g frit 43.26 46.53 6.43 5.55 36.43 34.83 42.02 3.41 22.85 Glaze characteristics Hydrometer density, TKPR, in the range of 20, 0.10 degrees Heat resistance, number of heat cycles Glaze temperature, s The softening temperature, С Temperature range of reduction, s Gloss,% Duration of aging at maximum firing temperature, h Microhardness, kg / mm Chemical resistance,%: to to 1 n. NaOH 2, 02 34, 67 1.10 2,952.30 28.89 49.66 1,652.20 Table 3 azure composition 3 Jj. 1.50 55 18 850-900 550-600 570-610 95 1.52 57 17 850-900 540-600 560-610 96 1.5 720 99.92 98.52 1.0 710 99.94 98.78 Frit cooking temperature, С Quality of coverage, category Coating color Continuation of table 3 1200-1250 1200-1250 1200-1250 one one Red-Violet-violet blue with blue-red-bluish tint LIVOM