SU979298A1 - Ceramic composition for making tiles - Google Patents

Description

(54) CERAMIC MASS FOR FURNISHING The invention relates to the ceramic industry and can be used on ceramic enterprises engaged in the production of facing ceramics. A famous ceramic mass for the manufacture of veneer tiles, including, weight. Clay24-32 Quartz sand17-23 Kaolin18-22 Bentonite clay2-4 Perlite8-12 Fireclay9-11 Dolomite or limestone 8-12 1. Tiles made of this ceramic mass have the following properties: Flexural strength of tiles, MPa up to 20 Compressive strength, MPa 110.0 Total shrinkage,% 0.5-0.6 Coefficient of thermal expansion, (4-5) 10 Firing temperature, ° С950-1050

TILE The disadvantage of this mass is the low durability of the tiles, the considerable cost of the tiles and the low quality of the products due to rejection - cooling cod, low coefficient of thermal expansion. Closest to the described invention is a ceramic mass for the manufacture of facing tiles, comprising the following components, wt.%: Clay 30-43 Kaolin 5-8 Bentonite 3-5 Quartz sand 10-18 Chamotte (skull) 10-17 Mel 2-4 Granit 15-20 2. The tiles obtained from the ceramic mass after the first firing have a shrinkage of 0.4-1.1%, water absorption is 15-16%, the flexural strength of unglazed tiles is 12-13 MPa, glazed 2123 MPa, the maximum firing temperature is 1030 C. The disadvantage of this composition of the mass in the low coefficient of thermal of expanding and increasing shrinkage of the tiles. The low coefficient of thermal expansion (5.2-5.5) 110 does not provide heat-resistant I Ceramics at a watered-off temperature of 920 ° C. The aim of the invention is to increase the coefficient of thermal expansion and reduce shrinkage. The goal is achieved by the fact that the ceramic mass for the manufacture of facing slabs including clay, bentonite, quartz sand, chamotte, granite, additionally contains nepheline syenite at the following ratio of components, wt.%: Clay43-49 Bentonite 1-3 Juvartsevye sand 12-18 Chamot 4-6 Granit 10 -14 Nepheline syenite18-22 The introduction of non-feline syenite into the ceramic composition favorably affects the reduction of shrinkage and the increase in thermal stability. 4 The introduction of nepheline syenite has a beneficial effect on reducing shrinkage and increasing heat resistance. The introduction of nepheline syenite is advisable within the limits of IS-22%, since a smaller amount does not ensure a non-shrinking mass, and the introduction of a larger quantity may entail the appearance of deformation of the products. The preparation of the ceramic mass is carried out as follows. The grinding and mixing of the components is carried out by a wet method in a ball mill to a residue of 2.0-2.5% on a sieve 0056. A press powder with a moisture content of about 7% is prepared from the slurry. From the obtained press powder, pies of 150x150x5 mm are pressed at a pressure of 20 MPa on a laboratory hydraulic press. The tiles are dried at a temperature of 120 ° C to a moisture content of 0.5% and are calcined in a laboratory silica fuse in a high-speed mode at a firing temperature of 1000 ° C and time-. about 20 minutes The invention is illustrated by specific examples in the table.

Clay Veselovska

J

Kaolin Bentonite Quartz sand Chamotte (skull) Chalk

Granite

Nepheline syenite

Properties

Scalding temperature, s

Roasting time, min

Temperature watered roasting, ° C

5-8

one

2 15

3-5

12 6

10-18

10-17

five.

2-4

ten

12 20

15-20

22

1000

1000

1020

20 20 20

900

900

Claims (2)

960-980 As can be seen from the table, the use of the proposed ceramic mass allows shrinkage and increase the thermal expansion coefficient, which will lead to the possibility to produce ceramic tiles on high-speed continuous-flow conveyor lines at a temperature of poured roasting at 920 ° C using fusible glazes. Comparison of such indicators as flexural strength of unglazed and glazed tiles and water tiles shows that these indicators are quite high and are preserved in the proposed ceramic mass compared to the prototype. Claims Ceramic mass for the manufacture of facing tiles, including clay, bentonnt, quartz sand, fireclay and granite, which, in order to increase the coefficient of thermal expansion and reduce shrinkage. It contains nepheline syenite in the following ratio of components, wt.%: Clay43-49 Bentonite1-3 Quartz sand12-18 Shamot4-6 Granit10-14 Nepheline syenite18-22 Sources of information taken into account in the examination 1. USSR author's certificate P 485092, cl. From 04 To 33/00, 1973. 2. Author's certificate of the USSR N 717006, cl. From 04 To 33/00, 1977 (prototype).