SU670546A1 - Frit for enamel - Google Patents

Description

one

The invention relates to glaze frit compositions used in the manufacture of veneered ceramics.

Known glaze, including weight. %:

47,34-59,55

SiOa

Aoz

7.9-11.7 10.15-13.55

Vaoz

1-3

Zno

Cao

1.51-2.6 1.47-2.48

MgO

NGD 0.63-0.78 3.19-3.93

K20

FegOs + TiOj not more than 1 1 Glaze cooking temperature 1380 ° С. Closest to the invention is the composition of the Frit, including, weight. % SiOa63-67

ABO3,3-6,7

Regoz0,1-0,3

CaO7.6-8.9

MgO5.3-5.8

ZnO4.9-5.1

NaaO6,6-7

CgO2,7-3,3

Frit cooking temperature 1430-1450 ° С

2

The purpose of the invention is to reduce the temperature of the cooking of the frit.

This is achieved by the fact that the frit for glauri further contains SrO and Ti02

at the next ratio of components

weight. %:

SiOs

63-67.33 ABOz 4.84-5.18

ReaOz 0.10-0.11 5.45-5.79

CaO 0.17-0.18 MgO 5.85-6.25 ZnO 2.52-2.71

K20 5.78-6.15

NazO

SrO2.0-6.01

TiOa4,27-6,27

The frit is cooked in ground-type crucibles in an electric furnace with silicon heaters at 1350 ° C.

During the cooking process, to achieve homogeneity of the melt, careful movement using steel rods is carried out. The end of the cooking of the frit is determined by the absence of knots on the elongated glass yarn. After cooking, the finished frit is granulated in cold water. After drying, the Frit is ground in a porcelain ball mill until it is completely passed through a 1000 sieve / cm sieve. A slink consisting of 98 wt. Is prepared for glazing on the cladding. h. finely ground Frit and 2 wt. including dry ground bentonite (Oglanlinskoye field).

Samples are glazed by the method of dipping. Glazed samples are calcined in a neutral-oxidizing environment at 950-1050 ° C. To obtain the glaze take weight. h .: quartz or quartz sand 65,11; alumina 4.79; zinc oxide 6.05; calcium carbonate 9.8; potassium carbonate 3.87; sodium carbonate 9.6; strontium carbonate 6.74; titanium dioxide 5.6.

The offered glaze has the following properties:

Maximum temperature, ° С

1350

cooking

950-1050

roasting

Start of melting, ° C

950-980

1010-1030 End of melting, ° C Start spreading, ° C

FROM SIMPLE, WITH

670-700 linear thermal coefficient

extensions

at 400 ° C (57-63) 10-H / deg.

at a temperature

Size (65-77,7) 1 / deg. The average value of the sample viscosity at

650 ° С, П40,9X103

Whiteness,% 78-85

Brilliance, number 10.8-11.9

Heat resistance

heat exchangersMore than 8

Microhardness, kg / mm 488-607

Chemical stability of frit,%

v20% SNS1.44-99.8

in 2n. NaOH98.28-98.4

The deafening crystalline phase is the mineral sphene (CaO-TiO2-SiO2), which makes it possible to obtain coatings of high whiteness.

In tab. 1 shows the specific formulations of the proposed frit for glaze, and table. 2 - physical and chemical properties of glaze.

Table 1

The maximum temperature of glaze cooking is 1350 ° C, the firing temperature is 950-1000 ° C.

table 2

Claims (2)

Invention Formula Glaze frit, including SiO2, ABOZ, ReZOZ, CaO, MgO, ZnO, K2O, NajO, characterized in that, in order to reduce the cooking temperature, it additionally contains SrO and TiO2 when following components, weight, %: Si02 63.0-67.33 ABOZ 4.84-5.18 Re203 0.10-0.11 CaO 5.45-5.79 MgO0.17-0.18 ZnO5.85-6.25 K2O2.52-2.71 NaaO5.78- 6.15 SrO2-6-6.01 TiOz4.27-6.27 670546 6 Sources of information taken into account during the examination 1. USSR Author's Certificate No. 356255, cl. OZS 5/00, 1971. 5 2. USSR author's certificate No. 485982, cl. OZS 9/00, 1973.