RU1821448C - Glaze frit - Google Patents

Abstract

Usage: manufacture of ceramic tiles for interior wall cladding. SUMMARY OF THE INVENTION: The frit contains, wt.%: Silicon oxide 52.0. - 57.0 BF SlOa: alumina 4.0 - 6.6 BF AlaOa; boron oxide 21.0-23.0 BF B20z; sodium oxide 8.2-9.2 BF NajO; calcium oxide 4.4-5.6 BF ЈaO; barium oxide 3.1 - 5.0 BF BaO, Glaze characteristics: spill temperature 860 -. heat resistance of the glaze 180.-200 ° C. 1tab.

Description

The invention relates to the production of ceramic products, in particular to glaze, and can be used in the manufacture of ceramic tiles for wall cladding.

The purpose of the invention is to reduce the temperature of the spill of glaze, to increase the heat resistance of the glaze.

The goal is achieved in that the frit, including SiO, A bOz, NaiO, BaOz, CaO, BaO, these components contain in the following amount, wt.%:

SI0252.0-57.0.

 .4.0-6.6

Na208.2-9.2

B2Oz21.0-23.0

CaO4; 4-5.6

BaO3.1 -5.0

The pouring temperature of such a glaze is 880 - 920 ° C.

Heat resistance of the glaze 180-200 ° C.

Achieving a positive effect, namely, reducing the spill temperature of the applied glaze, increasing the heat resistance of the glaze coating while improving its quality (transparency), is explained by the combined effect of boron and sodium oxides. In the prototype, the ratio of B20z: NaaO 3 (3 - 5). With this ratio, the system bears the nature of a continuous two-frame structure. In the proposed composition, this ratio is less than three (2.2 - 2.8) and the segregation system has the form of individual drops. Together with a lower total content in the proposed frit of boron oxide, all this gives an increase in the rate of penetration of the glaze and improves the clarification of the glass. And the increased content of the proposed sodium oxide glaze in comparison with the prototype contributes to a decrease in the crystallization ability of glasses.

When sodium oxide is introduced into the frit of more than 9.2 wt.%, The viscosity of the slip increases and the tendency of the glaze to age increases (pr. 13). When the content of sodium oxide is less than 8.2 wt.% Reduces 00 SE

Ј

with heat resistance of the glaze coating (pr, 10).

When boron oxide is introduced into the frit of more than 23.0 mass%, a decrease in the stability of the glaze is observed (sp. 17). With boron oxide content of less than 21.0 wt.%, The goal of lowering the spill temperature is not achieved (Ex 14),

When the content of silicon oxide in the frit is less than 52.0 wt.%, And alumina less than 4.0 wt.%, A decrease in the CTE of the glaze is observed and, consequently, a decrease in the heat resistance of the glaze coating (Pr. 4 and Pr. 6). With the introduction of silicon oxide in the frit of more than 5.7.0 wt.%, And alumina of more than 6.6 wt.%, The effect of lowering the spill temperature disappears (S.3 and S.9). When calcium oxide is added to the frit, more than 5.6 wt.% Increases the viscosity of the glaze and its transparency decreases (pr.21). With a calcium oxide content of less than 4.4 May. % the positive effect of increasing the heat resistance of the glaze is not achieved (ex. 18). When barium oxide is introduced into the frit of less than 3.1 wt.%, The gloss of the coating is reduced (ex. 22). The introduction of barium oxide of more than 5.0 wt.% Is not economically feasible (D.25).

Example 1. Estimated quantities of raw materials: quartz sand, PShS, soda ash, boric acid, chalk, barium carbonate - containing, respectively, oxides, wt.%: SI02- 56.3: - 4.2; NaaO - 8.3; BaOz - 21.8; CaO - 4.5; BaO 4.9 is thoroughly mixed and fritted at a temperature of 1350-1450 ° C. Frit granulated in water. Glaze is ready t wet grinding frits with do0

5

0

5

0

5

the addition of 5.0 wt.% refractory white clay to the residue on a sieve with a mesh N 0063 GOST 6613-86 not more than 0.1 - 0.1.5 wt.%. The density of the glaze suspension 1.62 - 1.65 g / cm3, fluidity (B 3 -4) - 17 - 18 seconds. The glaze suspension is applied to the ceramic tile by irrigation. Consumption per tile size of 150 x x150 mm - 23 - 25 g. Firing is carried out at a maximum temperature of 900 ° C. The total firing duration is 27 minutes. After firing, the glaze coating has a shiny surface without defects and meets the requirements of GOST 6141-82.

Other transparent glaze frits are listed in the table.

The invention was tested at Leningradskiy for water-ceramic products, which fully confirmed the possibility of achieving a positive effect.

The invention may find application in the manufacture of various ceramic products for both technical and domestic purposes.

Claims (1)

The claims A frit for producing a glaze coating comprising SlOa. , B203, Na20, CaO, BaO, and so on, in order to reduce the temperature of the spill of the glaze and increase the heat resistance of the coating, it contains these components in the following amounts, wt.%: SI0252.0-57.0 AYEz 4.0-6.6 B20z21.0-23.0 NazO8.2 - 9.2, Sar 4.4-5.6 Wab 3.1-5.0. The effect of the composition of the frit on some properties of the glaze coating L e r and m e, (-) - no measurements were made Table continuation