RU1772101C - Graze for chine articles - Google Patents

Description

1

(21) 4866460/33 (22) 09/17/90 (46) 10/30/92. Bull. Number 40

(71) Georgian Technical University

(72) G.G. Gaprindashvili. M.K. Kekelidze, G.I. G.R.Giorgadze, H.G. Gaprindasheli, I.M. Gagua and N.G. Kiri

(56) Copyright certificate of the USSR No. 1013429. cl. C 03 C 8/02, 1980.

USSR author's certificate N 250405. cl. C 03 C 8/02, 1967. (54) GLAZING FOR PORCELAIN PRODUCTS

(57) SUMMARY OF THE INVENTION: Glaze contains silica 65.57-68.99% BF SI02; alumina 12.42-14.41% BF A120z; iron oxide 0.31-0.36% BF Rv20z; titanium oxide 0.07-0.11% BF TiO2, calcium oxide 5.71-5.72% BF CaO; magnesium oxide 3.68-3.74% BFMdO; potassium oxide 1.76-1.98% BF K20; sodium oxide 1.52-1.63% BP Na20; chromium oxide 0.54-1.63% BF Cr20z; zinc oxide 4.82-5.85% BF ZnO. Glaze characteristics: firing temperature 1350-1410 ° С, KLTR (51.2-56.3), bending strength 65-99 MPa, color - solid. 2 tab.

The invention relates to ceramic technology and is intended for coating porcelain products.

Known glaze intended for glazing porcelain products containing; wt.%:

Si02- 68.05-68 75

 - 16.6-16.8

Re20z - 0.49-0.5

Ti02-0.17-0.18

CaQ.-5,89-6.33

MgO-3.32-3.57

K20 -3.36-3.48

Na20-1.09-1.42

The disadvantage of this porcelain glaze is its low coefficient of thermal expansion, an increased amount of Re203 + Ti2. Closest to the proposed one is the known porcelain glaze of the following composition, May% SI02 70-76: A1203 13.4-14.8: RegOz-0.22-0.26; 7U2 - 0.1-0.2: CaO - 6.3-9.4; MgO - 0.27-3.5 NaO K20

1.35-1.42. The disadvantage of this glaze is its narrow melting range, low coefficient of linear thermal expansion, and temperature stability at high temperatures. The foregoing limits the scope of use of the composition.

An object of the invention is to provide a high temperature resistant color glaze, increase the coefficient of linear thermal expansion, and extend the melting range.

This goal is achieved in that the glaze containing Si02, A1203, Fe203, TiO2, CaO, MgO, No. 20 - K20 additionally contains Cr20z and ZnO, in the following ratios, wt.%:

Si02-65.57-68.09;

SpgOz -0.54-1.63;

MgO- 3.68-3.74;

A 20z-12.42-14.41:

TU2-0.07-0.11:

ZnO- 4.89-5.85;

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ABOUT

Re20s -0.31-0.36;

CaO-5.71-5.72;

Na20-K20 -3.22-3.61.

Comparative analysis with the prototype shows that the claimed composition of the glaze is different from the known introduction of new components, namely zinc oxide and chromium oxide. Thus, the claimed technical solution (invention) meets the criterion of novelty.

An analysis of the known glaze compositions used to prepare porcelain glassy coatings showed that the introduction of the claimed solution to the substance is known, for example, for coloring all glazes fired up to 1400 ° C in oxidizing and reducing gas media, spinel pigments are suitable: CoO CrgOz: CoO - MU - ReaOz - ZnO - Cr20z - ReaOz. These high temperature materials are resistant to oxidation and are characterized by sufficiently high chemical resistance.

It is also known that chromium oxide

- dyeing (in green) oxide increases chemical resistance, gives opacity and smoothness of the glaze, and zinc oxide

-Good melt, increases electronic conductivity, glaze elasticity.

However, their use in glaze blends in combination with other components does not provide the properties that they possess in the claimed solution, namely, the extension of the melting temperature range, the temperature stability of the color coating at high temperatures, and the expansion of the thermal expansion coefficient.

Thus, this composition of the components gives new properties to the glaze, which allows us to conclude that the claimed solution meets the criterion of significant differences.

The invention is illustrated by the specific chemical compositions of the blends to produce colored glaze (Table 1).

The following components are used as raw material (in wt.%):

1.Pegmatitis - 47.2-52.98

2.Quartz sand - 16.1-24.3

3.Kaolin - 6.79-9.3

4. Dolomite-13.9, 5. Alumina-1.3

6. Chromium oxide - 0.54-1.63

7. Zinc oxide - 4.89-5.85

Glaze preparation was carried out

in the following way. Raw materials

pre-crushed and joint wet fine grinding of thinning and clay materials in ball

mills to a fineness of sieve 0056

holes / cm not more than 0.02-0.05%. Glazing

produced by dipping or spraying. Firing at 1380-1410 ° C.

Properties of porcelain glazes based on the proposed and known compositions are given in table. 2.

Colored glazes based on the proposed compositions are characterized by a wide

firing interval, high temperature resistance in acidic and alkaline environments.

The use of the proposed glaze compositions makes it possible to improve the quality of porcelain manufactured and widens the color palette.

Forfor glaze based on the described charge differs from the known:

-high temperature resistance (60-80 ° C) in an oxidizing and reducing environment;

-long melting range (60-70 ° C);

-increased Ph.D. (13-18%)

 in quality and aesthetic appearance it surpasses the known ones by 2-3 times.

Claims (1)

The claims Glaze for porcelain products, including SI02, A120z. Re20z, TUa. CaO, MgO, K2O, N00, characterized in that, in order to obtain a high-temperature-resistant colored glaze, to increase the coefficient of linear thermal expansion and to expand the melting range, it additionally contains CrgO3 and ZnO in the following ratio of components, May. %: SI02 65.57-68.09 ALOs 12.42-14.41 ReaOs 0.31-0.36 TU20.07-0.11 CaO5.71-5.72 MgO 3.68-3.74 K201.76-1.98 N320 1.52-1.63 Cr20z 0.54-1.63 ZnO 4.89-5.85 Table 1 table 2