| 摘要 |
A lead-free and cadmium-free glass composition which, after crystallisation, contains quartz-rich and/or keatite mixed crystals as main crystalline phase and has a low thermal expansion coefficient (20-700 degrees C) of <2 x 10<-6>/K, consists of (by wt.) 0-5% Li2O, 0-5% Na2O, <2% K2O, 1-10% Li2O+Na2O+K2O, 0-3% MgO, 0-4% CaO, 0-4% SrO, 0-4% BaO, 0-4% ZnO, 15-27% B2O3, 10-20% Al2O3, 43-58% SiO2, 0-3% TiO2, 0-4% ZrO2, 0-2% Sb2O3 and 0-3% F substituting for O, together with up to 30 wt.% pigment. The average bending tensile strength of the completely decorated glass-ceramics is >30 MPa after firing. Also claimed is production of a glass-ceramic which has been glazed, enamelled and decorated with the above glass composition by firing of the glaze, enamel or decorative layers simultaneously with glass ceramicising to form the glass-ceramic.
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