Lead-free and cadmium-free glass composition for glazing, enameling and decoration of glasses or glass-ceramics, and method for the production of glass-ceramics coated therewith

摘要

A lead- and cadmium-free borosilicate glass, having a specified composition and having a low thermal expansion coefficient, is new. A low thermal expansion coefficient lead- and cadmium-free glass, for glass coating, enameling and decorating glasses or glass-ceramics, has the composition (by wt.) 0-6 % Li2O, 0-5 % Na2O, 0 to less than 2 % K2O, 2-12 % Li2O + Na2O + K2O, 0-4 % MgO, 0-4 % CaO, 0-4 % SrO, 0-1 % BaO, 0-4% ZnO, 3 to less than 10 % Al2O3, 13-23 % B2O3, 50-65 % SiO2, 0-4 % TiO2, 0-4 % ZrO2, 0-4 % F (substituting for oxygen) and up to 30 % firing temperature resistant pigment. An Independent claim is also included for processes for producing a glass-ceramic which is coated, enameled and decorated with the above glass.