Glazes for glass-ceramic articles

摘要

The present invention is concerned with the preparation of glazes which are especially suitable for application to glass-ceramic articles containing potassium fluorrichterite as substantially the sole crystal phase. The glazes consist essentially, expressed in terms of weight percent on the oxide basis, of SiO2:46-50 Al2O3:5-8 ZrO2:0.3-1 Li2O:1-2 Na2O:2-3.5 K2O:1-2 CaO:1-4 ZnO:2-6 SrO:2-6 B2O3:9-11 PbO:20-25.