ENGOBE Russian patent published in 2005 - IPC

FIELD: building industry; production of ceramic building materials.

SUBSTANCE: the invention is pertaining to the field building industry; production of ceramic building materials, for example, it may be used in production of the color ceramic bricks applied for an external lining of buildings, facilities and formation of interiors. The engobe for a facing ceramic bricks contains in its composition (in mass %): a wollastonite concentrate - 31-35, a colorless transparent glassbats - 35-40, burnt gault or burnt clear gault - the rest. The engobe is prepared using a slip process by a wet grist in a ball mill. The acicular form of wollastonite crystals provides a good hiding of an angobe coating, and in a combination with glass bats - an adhesive strength of the coating. Blockading of the open pores on the face surface of an item due to a densely sintered angobe layer results in a decrease of the general hydraulic conductivity of the items and at a sufficient cohesive strength of a decorative layer with the ceramic basis improves frost resistance of the decorated lining ceramics. The high chemical purity of the wollastonite concentrate and utilization of colorless transparent glass bats (with the contents of staining oxides of no more than 0.20 %) increases the coating whiteness and improve the decorative properties of the angobed items. The necessary color palette of the coating depends on the choice of a ceramic pigment. The technical problem of the invention is to increase the strength of adhesion with the ceramic base, to improve whiteness and frost resistance of the items.

EFFECT: the invention ensures an increased strength of adhesion with the ceramic base, improved whiteness and frost resistance of the items.

2 cl, 3 tbl