SU1089068A1 - Transparent glaze - Google Patents

Abstract

TRANSPARENT GLAZE, including SiOa, AUpj, CaO, Mgb, BaO,, so that it, in order to improve the quality of the coating, contains these components in the following amounts, wt%: SiO 49 , 5-54.0 4.0-6.0 Al20 24.0-27.5 BjO 4.0-6.0 CaO 0.5-1.0 MgO 4.0-6.0 BaO 5.5- 8.0

Description

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This invention relates to the composition of the glaze and can be used in the manufacture of facing cakes for internal and external facing, as well as majolica. Known fiT glaze, containing wt.%: 62.5-66.3 SiOg 5.6-7.1 AljO, 12.7-13.8 2.7-3.2 CaO 0.3-0.5 MgO 2 , 0-2.3 ZnO 5.0-6.0 1.0-1.3 3.3-3.7 BaO Known glaze has a firing rate of 960-980 ° C. The disadvantages of the known glaze are the long calcining time (3 hours and 15 minutes), as well as the content of ficitous ZnO and multicomponent composition. Closest to the offer by properties is a glaze 2 containing, in May.%: 0.3-0.8 18-24 0.7-1.5 0.2-0.5 3.5-4.5 9, 0-12.8 0.1-0.2 1.5-3.0 The disadvantage of this glaze is the appearance of cutting across the edges of the tile immediately after the firing. In addition, the zoo is not transparent enough. The glaze coating with a normal layer thickness has in a large number such a defect as nakos. Only with a very thin layer of eyes there are fewer mistings, but a def is a business. The purpose of the invention is to improve the quality of the coating. This goal is achieved by the fact that transparent glaze, including SiOp, Al20, BjO, CaO, MgO, BaO NajO, contains these components in the following amounts, wt.%: 49.5-54.0 4.0-6.0 24.0 -27.5 4.0-6.0 0.5-1.0 4.0-6.0 5.5-8.0 Transparent glaze can be used for ceramic tiles of a firing speed of 30 minutes, with a maximum temperature of firing 1000-1020 C, as well as majolica products with a firing duration of 8 hours and a firing temperature of 900-940 C, i.e. it is universal. The single glaze for facing tiles and majolica products simplifies the technology, as it eliminates the need for additional cleaning of cooking stoves, mills, pools, etc. The mixture of glaze, wt.%: Sand 35.45-43.62 Boric anhydride 20.32-24 , 25 Barium carbonate 4.56-6.56 Mel3.74-7.75 Kaolin10.77-15.52 Dolomit2.01-4.19 Soda8.87-12.39 The charge materials are averaged before cooking. The frit was boiled at the factory in a frit-stove in the amount of 400 kg for 4.5 hours at 1350 ° C. Grinding frit is carried out in a ball mill of the following mill composition,%: Frit 94.5; Kaolin 5.5; -CMC 0.02; NaCl 0.35; black dye (no. 1063) 6. The moisture content of the slip is 39-41% with a density of 1.571, 60 g / cm yield strength 5s. The grinding of the glaze is carried out to a residue of 0.1% on sieve No. 0056. The facing tiles are burned in a roller furnace at 1000-1020s, the duration is 30 minutes. Majolica products are fired in a tunnel kiln for 8 hours at a maximum temperature of 900-940 ° C. Glaze is applied to the products by pulpfusion. The beginning of the softening of the glaze, the end of the softening of 900 C, i.e. softening interval. Specific compositions and their properties are given in table. 1 and 2 respectively.

Table 1

cream color

at a maximum temperature of 6-12

Claims (1)

TRANSPARENT GLAZE, including SiOa ,, A1d. O ₃ , B _? 0j, _ ^ CaO, MgO, BaO, Na ^ O, '0 tl and h'a with the fact that, in order to improve the quality of the coating, it contains these components in the following amounts, wt.%: SiO ^ 49.5-54.0 AI2O3 4.0-6.0 Βλ0 24.0-27.5 Cao ’ 4.0-6.0 MgO 0.5-1.0 Bao 4.0-6.0 Na ^ O 5.5-8.0