SU1000431A1 - Crystalline red glaze - Google Patents

Description

The invention relates to compositions of red-colored glazes and can be used in the manufacture of ceramic products, including for the glazing of tiles, produced using modern speeds {the first firing modes in slotted roller furnaces.

Known glaze 1, comprising the following components, wt.%:

60-80

Lead oxide 2-10

Kaolin

Quartz

5-10

sand 1-3

Calcium Oxide 1-10

Chromium trioxide 10-30

Tin dioxide

The disadvantage of this glaze is: exposure at a maximum temperature of 30 minutes, then cooling to additional exposure. Thus, the above composition is unsuitable for the manufacture of glazed products using high-speed firing methods in slot-type roller kilns.

Closest to the offer is. The composition of the red crystalline glaze, containing, wt.%: SiO. 13.1-18.71; Al20i 5.83-6;

FejO, 0.01-0.02f PbO 72.41-75.47; CaO 0.13-0.16; MgO 0.14-0.17; 2.7-5.15.

five

A disadvantage of the known composition is the long duration of heat treatment of 10.5-12 hours.

The purpose of the invention is to reduce the heat treatment time.

ten

The goal is achieved by the fact that red crystalline glaze, including PbO, SiO, C, CaO, MgO, CrjOe, additionally contains Na O, ZrO., SrO in the following ratio of components, wt.%:

72.74-81.36

PbO 6.92-10,42

Si Od.

20 1.76-2.05

A12.0, 0.01-0.03

, 0.07-0.07

CaO 0.0-2-0.03

MgO 4.81-4.9

Crg.0

25 0.02-0.04

2.38-7.04

ZrOi

SrO2.65-2.67

The invention is explained by co-shot compounds containing wt.%: 3 1000431 A1, CaO MgO Na, 0 1.76 0.07 0.02 0.02 2.38 4.38

8.65

1.90 0.07 0.03 0.04 4.74 4.85

10.42

2.05

0.08 0.03 0.04 7.04. 4.90

Prosnovian kaolin, quartz sand, strontium carbonate zirconium carbonate, and red lead are used as raw materials.

components of the charge-. finely crushed, mixed and fritted at 1000-1100 ° C. After melting and granulation of melt B by running water, the Frit adds 99% of the mass fraction of Frit to 1% Veselay clay and (–– over 100%) 0.15% carboxymethylcellulose and 0.02% sodium pyrophosphate (1 O H2.0) in as grind to residue on the grid No. 0063 0,06-0,12%, ZrO,

0.02

2.66 77.04

2.67 72.74

0.03

Glaze can also be applied without pre-fritting, raw, and the grinding is done only in wet form. Melting of the charge, as well as firing should be carried out in an oxidizing or neutral erie.

Tiles are glazed by irrigation. Glazed tiles are burned in a roller oven at a high-speed mode: facade tiles in 34 minutes, tiles for interior wall cladding in 27 minutes at a maximum temperature of 960-1 ,.

The table shows the properties of the proposed glaze. SrO -PbO 2.65 81.36

Glazing sintering temperature, С

Firing interval, From the beginning

end

Optimum firing temperature, s

Size of crystalline formations, µm Thermal expansion coefficient, ° С

Optimum firing temperature in high-speed mode with an exposure at a maximum temperature of 8-10 minutes, C

Heat resistance of glaze on tiles made from local low-melting clays, С

710

660

860

886

870

970

990

910

930

30-150

20-130 75.4, 10

980-1000

970-980

960-970

200

Claims (2)

170-180 65.7-10 68.6 .- 10 Thus, it is possible to use the proposed composition for the production of products according to the high-speed method in modern slot kilns with obtaining a high-quality coating. Claims of the invention Red crystalline glaze, including PbO, SiO, CaO, MgO,. : 72.74-81.36 PbO. 6.92-10.42 1.76-2.05 o; o1-o, oz 0.07-0.08 0.02-0.03 4.81-4.9 0.02-0.04 2 , 38-7,04 2,65-2,67 Sources of information, Bd B attention for examination 1. Author's certificate NRB9441, cl. 03 C.9 / 00, 1975, 2. USSR author's certificate 26056, cl. C 03 C 9/00, 1977 ootype).