SU1707010A1 - Non-frit glaze - Google Patents

Abstract

The invention relates to the technology of silicates and can be used in the industry of building materials as a coating for facade ceramic tiles and floor tiles. The purpose of the invention is to reduce the duration of firing and increase frost resistance. For this, the composition of the glaze contains, wt%: SI02 56.52 - 60.48; A1203 7.57 - 8.82: CaO 20.34 - 22.71; MDO 0.12-0.16: No. 20 1.05- 1.36; K20 1.10 - 1.39; Re20z 1.24 - 1.35; B203 7.32-8.33. Firing duration 30 minutes, frost resistance 150 cycles. 1 tab.

Description

The invention relates to silicates and can be used on the building materials industry as a coating for facade ceramic tiles and floor tiles.

Known glaze, containing, wt.%;

SI02 WHO Re20

AI203 MgO K20 CaO Na20 Properties:

Heat resistance, ° С ТКЛР / 20-40С ° С / х10 b grad

Firing temperature, ° С

Firing duration, min Gloss,% Whiteness,%

60.37-60.96

3.67-5.05

0.68-0.76

5.64-10.9

1.69-3.11

0.84-1.1

13.82-17.47

6.58-7.36

200

7.44-7.66

1060-1130

50-100

10-12

45-50

Abrasion

.02-0.03 Mohs hardness 7 Cost of 1 ton of raw materials, rub The disadvantage of this glaze is high firing temperature and cost, long-firing, insufficient gloss and high thermal expansion coefficient.

The closest in composition and effect achieved is the glaze, containing, wt.%:

Si0257.36-58.08 MgO 1.34-1.54 V20z 7.09-7.11 7.24-7.63 No. 20 3.72-4.39 Fe-Oz 0.94-0.96 CaO 19.47-19.86 K20 1.54-1.73 Characteristics: ТКЛР / 20-400 ° С / х10 ° hail 6.9 Temperature resistance. ° C 200

ate

with

-J o

sj

oh oh

Firing temperature, ° C Firing duration, min. Gloss,% Whiteness,% Abrasion, g / cm2

980-1080

50-300

25-26

60-61

0.015-0.02

Frost resistance, cycles50 The disadvantage of the prototype glaze is long firing and low frost resistance while maintaining high levels of other properties.

The purpose of the invention is to increase the frost resistance and reduce the duration of firing.

This goal is achieved by the fact that the glaze, including SI02, A1203, CaO, MgO, Na20, CsO, Pe.0z, B20z, contains them in the following ratios, wt%:

S10256.52-60.48 MgO - 0.12-0.16 Re202 1.24-1.35 7.57-8.82 Na20 1.05-1.36 B20z 7.32-8.33 CaO 20.34- 22.71 K20 1.10-1.39. Perlite, datolite concentrate, quartz sand and kaolin are used to obtain the proposed glaze.

A distinctive feature of the proposed glaze in comparison with the known one is that the mixture does not contain cullet or erklez. It is known that the presence of a mirror or glass in the composition of a glazed glaze worsens the rheological properties of the glaze slurry, increasing its viscosity at an optimum density of 1.58-1.71 g / cm, sufficient to obtain a high-quality coating. The reduction in the density of the glaze slip to achieve normal flowability has a negative effect on quality, since at low density it is impossible to provide the necessary layer of glaze. In addition, the application of a glaze with a low density leads to an overwetting of the raw material after a single firing of products, which contributes to the appearance of such a defect as cracks (cutting) on the surface. Using

erkleza in the mixture of glaze also leads to higher prices for the latter.

Examples of the compositions of the proposed glaze are shown in the table.

Cooking the proposed glaze

carried out as follows. The mixture prepared in accordance with the oxide composition is loaded into ball mills for grinding to the residue on the sieve 0056-0.2-0.4%. The density of the working slip of the glaze is 1.60-1.75 g / cm3. Physico-mechanical properties of the properties of the proposed glaze in the table. Application of glaze - by watering or spraying.

As can be seen from the table, the proposed compositions of glaze coatings allow to obtain ceramic glazed products with high indicators of properties. Compared with prototype icing

The glaze of the compositions given is characterized by higher frost resistance and a shorter roasting time. The wide firing temperature range allows the use of the proposed glaze as in

production of ceramic facade tiles and floor tiles.

Claims (1)

Claims of the Invention Glazed glazing, including SiO2, A120Z, CaO, MgO, Na20, K20, Rv20z, V20z, is different in that, in order to shorten the firing time and increase frost resistance, it contains these components in %: SI0256.52-60.48 A120z 7.57-8.82 CaO 20.34-22.71 MgO 0.12-0.16 Na20 1.05-1.36 K20 1.10-1.39 Re20z 1.24-1.35 V20z 7.32-8.33. The compositions and basic physical and mechanical properties of glaze