SU914524A1 - Dull glazing composition - Google Patents

Description

48.5-55.5

6.4-7.8

3.4-5.1

3.1- 4.6

5.6- 13.0

1.1-2.6

2.7- 4.9 0.1-0.2

0.11-0.27 0.10-0.15 0.02-0.06 4.3-6.7 1-1.6 0.2-0.3 0.06-0.14

I

The invention relates to compositions of glazes used to obtain a decorative coating of ceramic products, namely, matte restorative glazes.

Famous frosting [1], containing May. %:

5 ϊ 0 * 2.

Α1ιχ0 ₃

Cao

MDO

ΚγΟ

Ν3 _Ί 0

Ge ^ Oz

ΖηΟ

ⁱⁿ 1 ° 5

Cu

5η0 ^

MPO

Τ ϊ 0 ^

5γ0

WAO

Γ '

$ 0}

2

The disadvantages of this glaze are low frost resistance, thermal resistance and chemical resistance.

The closest in composition is

frosting [2], containing May.%: 5 Ο Οιχ 31.7-37.9 A 1 ^ 0¾ 6.0-7.0 Ge ^ Oh h 0.3-0.5 Cao 0.2-0.4 MDO 0.2-0.4 KtsO 1.9-2.5 Ia ^ O 12.0-13.0 B ^ O ^ 10.7-12.6 ΖηΟ 16.5-21.9 WAO 1.9-2.5 5.4-5.8 Cu 1.6-2.0 ΖτΟχ 2.3-6.0 This icing has a low ter with a capacity of 170–180 ° C and chemical resistant

stew, acid resistance of this glaze 98.5-99, alkali resistance 97.4-98.02.

3

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The relatively low heat resistance and, accordingly, frost resistance do not allow the use of this glaze for decorating artistic exterior ceramics, which have been used for a long time under the influence of atmospheric conditions.

The purpose of the invention is to increase the heat resistance and chemical resistance.

The goal is achieved by the fact that matte glaze, including 5ΐΟι, A10.0 CaO, MdO, K ^ O, Ha ~ O, ηΟ,

In ^ Og, CuO, additionally contains PbO and Sin in the following ratio of components, wt.%:

2 ΐ 0 (^ 29.25-31.50 Α1ς0 ₃ 2.90-3.22 Cao 7.02-7.95 MDO 0.21-0.24 to _g about 0.77-0.87 Ν3 _Ί 0 3.02-3.33 Re ^ Oz 0.11-0.12 ΖηΟ 24.56-25.68 In <уО 7.20-8.82 Cu 1.50-3.00 PYo 14.48-17.25 5n0 <^ 2.0-5.0

Glaze, annealed on ceramic products at 910-940 ^ 0, is distinguished by a matte surface of dark red velvety texture, characterized by a high temperature resistance and chemical resistance to chemicals, which allows its use for the production of exterior ceramic products and facing materials.

As raw materials for the preparation of used kvardrzy sand, borax, chalk, boric acid, pegmatite, zinc white, lead glaze, copper oxide, tin dioxide.

The components of the mixture are subjected to primary processing. Chalk dried to a moisture content not exceeding 2%. Crystal borax, pegmatite, chalk, lead glaze are ground to complete passage through sieve No. 09 (59.1 resp / cm * ² ·). The remaining components are not processed.

The components of the mixture are metered in a predetermined ratio and thoroughly mixed in a mixer, the mixture is melted in a quartz crucible with a capacity of 3 liters, placing in a gas furnace. Temperature

“The arch of the Frit is 1290 ± 20 ° C; the duration of the exposure is determined by the absence of nodules on the elongated glass filament. The duration of the cook, 5 ki is 3.5-4.0 hours and is maintained in the oxidizing atmosphere of the furnace.

After cooking, the melt is granulated into cold water.

The obtained Frit is dried and ground by a wet method in a spherical batch mill of periodic action with the addition of 10% Veselovskaya clay and water to a moisture content of the suspension 40-45%.

15 Grinding of the suspension is carried out until the residue on sieve No. 0063 (9428 holes / cm ¹¹ ) is 0.050.1% of the raw material. Glaze suspension with a density of 1.46-1.48 g / cm is applied to the surface of ceramic products, about 20 of which have passed through firing at 780,800 ° C, by dipping. Then the product is burned at 910-940 ° C in a reducing environment. The reducing medium is created by withdrawing a rag moistened with diesel fuel, rosin or tar into the kiln during the cooling period at 670720 ° C.

In tab. 1 shows the specific formulations for glazes ·, in table. 2 - physicochemical properties of these compounds.

Table 1

Components Composition wt.% one II 111 5 ίΟι ^ 31.50 30.08 ^G 29.25 A1 ι ^ Ο ^ 2.90 w, n 3.22 Cao 7.02 7.46 7.95 MDO .0.24 0.23 0.21 Cor 0.77 0.82 0.87 Ma _g 0 3.33 3.21 3.02 ^ε ^ Οι, 0.11 0, 11 0.12 ΖηΟ 24.56 25.03 25.68 ⁱⁿ 1 ° 3 8.82 8.15 7.20 Cu 1.50 2.20 3.00 PYo 17.25 16, 10 14.48 5ηθΐ} 2.00 3.50 5.00

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Table 2

Properties ---------------one,-,..,-----" Composition one h III The coefficient of linear thermal expansion (20-400 ^o C) e1 '10 "1 / deg one 63.0 1 —— | 64.5 65.0 Heat resistance, ° С 240 240 250 Same heat change 24 26 23 Melting temperature; ° С 910 930 940 Exposure at optimum temperature, h 0.5 0.5 0.5 Coverage category Higher Higher Higher Softening and reducing temperature, ° С 670 700 720 Temperature range of recovery, ⁰ С 670-720 670-720 670-720 Gloss,% 6 6 6 Glaze layer thickness, mm 0.18 0.2 0.18 Coating color Dark red with a velvety texture _β Microhardness kg / mm 672 668 678 Acid Resistance% 99.65 99.70 99.67 Alkali resistance,% 98.93 99.98 99.97 The density of the glaze on the areometer, g / cm 1.46 1.46 1.48 Frost resistance cycles Over 75 Over 75 More than 75

The glaze of the proposed composition allows to improve the quality of products by increasing the heat resistance, chemical cement, frost resistance while maintaining a low firing temperature and improving the decorative properties due to the velvety texture of the coating $ 0

tiyu dark red color.

These qualities allow the use of specified icing for decorating articles of artistic ceramics, including exterior, which is a long time ekspluati- ⁵⁵ ruetsya in atmospheric conditions and therefore must meet the demands of thermal and chemical resistance and hardiness.

Claims (1)

<claim-text> Formula of Invention </ claim-text> <claim-text> Matte glaze, including 5101, A1 <sub> th </ sub> 0 <sub> a </ sub>, CaO, MDO, K ^ O, Ea ^ O, ειβί ^ ηΟ, B <sub> a </ sub> 0 <sub> e </ sub>, CuO, which is distinguished by the fact that, in order to improve heat resistance and chemical resistance, it additionally contains PbO and 5η0χ in the following ratio of components, wt. %: </ claim-text> <claim-text> 5ί0 &lt; 2 29.25-31.50 </ claim-text> <claim-text> A1 <sub> g </ sub> 0 <sub> s </ sub> 2.90-3.22 </ claim-text> <table border = "1"> <tr> <td> <claim-text> </ claim-text> </ td> <td> <claim-text> 7 </ claim-text> </ td> <td> <claim-text> 914524 </ claim-text> </ td> <td> <claim-text> 8 </ claim-text> </ td> </ tr> <tr> <td> <claim-text> cao </ claim-text> </ td> <td> <claim-text> 7.02-7.95 </ claim-text> </ td> <td> <claim-text> </ claim-text> </ td> <td> <claim-text> PLC 14.48-17.25 </ claim-text> </ td> </ tr> <tr> <td> <claim-text> MDO </ claim-text> </ td> <td> <claim-text> 0.21-0.24 </ claim-text> </ td> <td> <claim-text> </ claim-text> </ td> <td> <claim-text> 5p0 ^ 2.0-5.0 </ claim-text> </ td> </ tr> <tr> <td> <claim-text> K 0.0 </ claim-text> </ td> <td> <claim-text> 0.77-0.87 </ claim-text> </ td> <td> <claim-text> </ claim-text> </ td> <td>