METHOD OF MANUFACTURING DECORATIVE AND FACING ARTICLES Russian patent published in 1997 - IPC

FIELD: manufacture of building materials. SUBSTANCE: stock containing an outer layer composed of quenched cullet and metal oxides and an inner layer composed of (in wt %) sand, up to 25; slag, up to 40; alumina, 5-7; binding agent, 2-8; and quenched cullet. Outer layer is applied directly onto the surface of inner layer preliminarily wetted with liquid glass. Heat treatment of stock includes heating to a temperature higher or equal to Littletone temperature of outer layer quenched cullet, incubation at this temperature, and two-step cooling with intermission at a constant temperature between the two steps. In the first step, cooling proceeds with velocity 10-30 C/min to upper anneal temperature. Minimization of gas release is achieved by introducing a liquid binder into the inner layer composition and pressing the layers. Stock is thermally treated in a mold or without mold preliminarily shaping it in dismountable form. Material of inner layer is supplemented with up to 40% of high-ignition substance, for example, sow dust, whose ignition temperature does not exceed 2/3 of maximum heat treatment temperature. Resultant article is characterized with high porosity of inner layer and low coefficient of heat conductivity. Cylindrical articles are manufactured in a rotating cylindrical mold. Into the stock outer layer, decorative components are introduced having the same coefficient of temperature expansion as that of glass. Articles may be directly attached to surface of building parts by way of joint heat treatment. EFFECT: improved manufacture process. 14 cl