SU893956A1 - Ceramic composition - Google Patents

Description

(54) CERAMIC MASS

one

This invention relates to ceramic technology, in particular, to compositions of masses for the production of majolica products coated with decorative lead glazes.

Formulations for the production of majolica products are known, including refractory and refractory clays, sand, nepheline, dolomite, and other materials l.j.

The primary production of majolica products is the possibility of using local raw materials, as well as high artistic qualities of the products.

The disadvantages of majolica products. are high (up to 16%) porosity water permeability, insufficient bending strength and heat resistance. A very big disadvantage that degrades the decorative properties of majolica products is the formation of a tsake. The reason for the insufficient heat resistance leading to the formation of a tsaque is the difference in the coefficients of the linear tergal expansion (CTE) of the masses and the glazes;

 The closest technical solution to the present invention is ceramic mass 2 for the production of majolica products, containing

refractory clay, quartz sand, nepheline, kaolin, and skull with the following ratio of components, wt.%: Clay refractory 13 Quartz sand 19 Nepheline .20

Kaslin. 27 Skull3

Majolica products, coated with glazes with lead content up to 30%, obtained by roasting with lOOO-llOO C have the following properties:

0-1 Heat resistance cycle

There is a tseka

15

12-16 Water absorption,% Linear thermal coefficient 5, 5-7,2, whom expansion

20

The purpose of the invention is to increase the heat resistance and the coefficient of thermal expansion, as well as the elimination of the formation of a heat seal.

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Claims (2)

The disadvantage of the above composition is the low heat resistance, insufficient CTE, which leads to the formation of a tset on the majolica isozoic. This goal is achieved that ceramic mps, ca for majolica products, including refractory clay, quark nepheline sand, kaolin and skull, additionally contain chamotte and broken glass as follows: compone weight%: Refractory clay 30-33 Quartz sand 5-15 Nepheline 20-25 Kaolin 6-8 Skull1-10 Shamot10-25 Cullet7-10 Masses are prepared according to a slurry logic of hot working. Products from plaster molds. After drying, it is present in an electric furnace. Example 1. Ceramics for the production of majolica li, containing the components of the sparse ratio, wt.%: Refractory clay 33 Chamotte powder 10 nefelin 23 Cullet 10 Quartz sand 7 Enriched kaolin7 Skull. 10 Received products with the following properties: Water absorption,% 10 Heat resistance, cycle 4 Thermal expansion coefficient 8.4 Presence of tset No Example 2. Ceramic material for production of majolica, containing the following ratio, weight: Refractory clay 30 Chamotte powder 15 Nefelin20 Cullet -10 Quartz sand .10 Kaolin is enriched. nyy8 Skull7 The resulting products have the following properties: Water absorption,% Heat resistance, Coefficient of thermal expansion, 1 wide None Presence of tset Example 3. Ceramic mass for the production of majolica products containing components in the following ratio, wt.%: Refractory clay 31 Chamotte powder 25 Nephelin 25 Crushed 7 Quartz sand 5 Kaolin enriched b Skull1 The resulting products are characterized by the following properties: Water absorption,% 12 Thermal stability, cycle4 Thermal expansion coefficient 7.910 Tseka No T kim, the articles made of ceramic mass of the proposed composition have high heat resistance and coefficient ter - nomic expansion in comparison with the known. Invention Ceramic mass for the production of majolica products, including refractory clay, quartz sand, nepheline, kaolin and skull, characterized in that, in order to increase the heat resistance and thermal expansion coefficient of the products, as well as exclude the formation of tsek, it additionally contains chamotte and broken glass with the following ratio of components, wt.%: Clay refractory 30-33 Quartz sand 5-15 Nepheline 20-25 Kaolin 6-8 Skull1-10 Shamot10-23 Cullet 7-10 Sources of information taken into account during the examination 1. Miklash vsky A.I. Technologists of artistic ceramics. L., Stroyizat, 1971. 2. Frost I.I. Porcelain, fa ns, majolica, Kiev. Technique, 1975, p.334335.