SU727585A1 - Avanturine glass - Google Patents

Description

 The invention relates to decorative glass, namely, aventurine glass compositions that can be used to make jewelry in the form of glaze on ceramic tiles. Closest to the described invention is aventurine glass, which includes components in the following ratios, wt%: SiO, 60-62., 2-3, .5 CaO 6-8 CuO. The disadvantage of this glass is the limited color of the crystals released, the cooking temperatures above (1470 ° C) and the thermal processing (1230 ° C). The purpose of this invention is to reduce the temperature of cooking and heat treatment. The goal is achieved by the fact that aventurine glass, which includes SlOj,, BrOj, Alj, Oj, CaO, Na5, O, K ,, 0, ,, and oxide of two; Valence metal, contains as divalent metal meth La CoO or RyoO , or MpO when following the ratio of components, wt.%: SiOi 40.3-51.6 BjOj 18.2-23. ,, 0., 9-2.5 1.8-4., 2 15-24.1 1-4 1.4-5.1 The aventurine effect in glasses is achieved by isolating color spinels during the heat treatment process:: blue when introduced into the composition of the glass CoO and CrjOy yellow with the introduction of FeO and and pink with the introduction of MpO and. Glass production is possible by the known methods of glass technology: pressing, casting, floating tape, etc. To obtain glasses, available raw materials, in particular quartz sand, boric acid, are used as the main raw materials.

alumina, chalk, sodium carbonate, potassium 5chromate.

Glasses are cooked in corundum crucibles at ± 10 for 2-5 hours. Heat treatment temperature 940 ° C + 20 J for 20-70 minutes. The environment is weakly

Example 1 Preparing a batch to produce glass with blue crystals creating an aventurine effect, according to conventional glass technology.

The glass is cooked in a glass melting furnace for 2 hours. Medium recovery. The melt obtained before production is heated by heat treatment, during which crystals of blue spinels of the composition CoOCr ,, Oj are formed, the heat treatment temperature is 940 ° C ± 10, the heat treatment time is 30 minutes. Glass production is carried out by casting into molds. Glass annealing temperature. The resulting glass is evenly covered with bright blue spangles up to 1.4 mM in size. - When glass is applied to a ceramic K5 on a tile, after cooking, it is cast into cold water, ground in a ball mill before passing through sieve No. 018. The ground glass is applied to ceramic tile using a spray method (spraying), the glass spreads evenly over the surface during firing, 20 min incubated at 950 ° C. The surface of the ceramic tile after firing is covered with glass with bright blue glitters up to 0.9 mm in size.

EXAMPLE 2 Glass heat treatment during which yellow spinel crystals of the composition FeO-Cr Oj are formed is carried out at 960 ° C for 70 minutes. The annealing temperature of the glass is 550 ° C.

Example 3. Glass was heat-treated, during which pink spinel crystals of MpOCzOz / are formed / are carried out at 930 ° C for 50 minutes. The annealing temperature of the glass is 550 ° C. The glass is evenly covered with bright pink glitter up to 1.7 mm in size.

All the obtained glasses have reproducibility, satisfactory cooking and developed properties, of different color and can be used as a glaze on ceramic tiles.

Table 1 shows the composition of the mixture.

Table 2 shows the composition of the glass The properties of the obtained glasses are given below.

Cooking temperature, with

Heat treatment temperature, ° C Annealing temperature, ° C

Heat treatment time 20-70 ki, min

Viscosity at temperature 10, heat treatment tour, P Density, g / cm 2.51-2.6 Linear coefficient, expansion.

Aw 1 / ° C

88-95,130

Heat resistance

П hydrolaboard class

Thus, the obtained avanturin glass is fusible, it has a beautiful appearance, positive physicochemical properties, and can be recommended for use in the manufacture of jewelry as a decorative glaze on ceramic tiles, Table 1

40,552

4737

2.50.9

7.53.2

26,542,4

yi

102.7

b1

51.5

40.5

52 37

47

37 0.9

2.5

0.9 3.2

7.5

3.2

26.5

42.4

42.4. 2.7

ten

2.7

.one

. 6.1

1.1

Claims (1)

1. USSR author's certificate No. 350760, class C. 03 C 3/30, 1972 (prototype).