| 摘要 |
<p>A glass material for chemical strengthening (11) has a temperature of 1150°C or less at a viscosity of logη=4 and a maximum value of average coefficient of linear expansion (α) of less than 1000×10-7/°C in the temperature range of from the glass transition temperature (Tg) to the yield point (At), and comprises glass components, in mol%, of 50-70% (but not including 70%) of SiO2, 4- 8% (but not including 8%) of Al2O3, 0-4% of B2O3, no Li2O, 10-22% (but not including 10%)of Na2O, 0-2% of K2O, 0-5% of ZnO, 5-15% (but not including 5%)of MgO, 0-3% of CaO, 0-5% of SrO, 0-5% of BaO, 0-10% of TiO2, 1.5-7% of ZrO2, 0-0.5% of Sb2O3, and 0-0.5% of CeO2.</p> |
