Lead and cadmium-free glass composite for coating porcelain glaze and enamel on and decorating glass or glass ceramics

Abstract

The invention relates to lead and cadmium-free glass composite for coating porcelain glaze and enamel on and decorating glass or glass ceramics. Particularly, the invention relates to lead and cadmium-free glass for coating porcelain glaze and enamel on and decorating glass or glass ceramics, which takes high-quartz mixed crystal and / or keatite mixed crystal as a main crystal phase after crystallization, has low-heat expansion which is less than 2X10-6 at the temperature of between 20 and 700 DEG C, and comprises the following components in percentage by weight: 0 to 5 percent of LiO2, 0 to 5 percent of Na2O, 0 to 2 percent of K2O, 1 to 1 percent of sigma Li2O+Na2O+K2O, 0 to 3 percent of MgO, 0 to 4 percent of CaO, 0 to 4 percent of SrO, 0 to 4 percent of BaO, 0 to 4 percent of ZnO, 15 to 27 percent of B2O3, 10 to 20 percent of Al2O3, 43 to 58 percent of SiO2, 0 to 3 percent of TiO2, 0 to 4 percent of ZrO2, 0 to 2 percent of Sb2O3, 0 to 3 percent of F which is used for replacing oxygen, and at most 30 percent of dye which is stabilized at the sintering temperature.

Description

technical field The invention relates to lead- and cadmium-free glass compositions for enamelling, enamelling and decorating glass or glass ceramics, which contain high quartz (Hochquarz) mixed crystals and / or keatit-mischkristalle (Keatit-mischkristalle) after crystallization Mixed crystals as the main crystal phase also relate to methods for producing glass ceramics equipped with the glass composition. Background technique Conventional glass ceramics contain high quartz mixed crystals and / or keatite mixed crystals as the main crystal phase, which are responsible for the low coefficient of thermal expansion. Depending on the crystal phase and grain size, these glass-ceramics can be present in transparent, translucent or opaque forms. Coloring by colored oxides depends on the desired application. The main areas of application of these glass ceramics with low thermal expansion are laboratory equipment resistant to temperature fluctuations, cooking utensils (Kochgeschirre), ...