| 摘要 |
<p>A glass composition, for making thermally stable substrates or plates, contains (by wt.) 55-70 (preferably 55-60) % SiO2, 0-3 (preferably 0-1) % B2O3, 2-6 (preferably 3-5) % Na2O, 5-11 (preferably 5-9) % K2O, 0-6 (preferably 1-6) % MgO, 2-11 (preferably 7-11) % CaO, 4-12 (preferably 6-10) % SrO, 0-2 (preferably 0-1 or 1-2) % BaO, more than 0 and NOTGREATER 0.5 (preferably 0.005-0.15) % SO3 and either (a) 0-5 (preferably 1-4) % Al2O3 and 5-10 (preferably 6-9) % ZrO2 or (b) 0-5 (preferably 1-4) % ZrO2 and 5-10 (preferably 6-9) % Al2O3. Na2O+K2O ≥ 8% (preferably 10-15%). MgO+CaO+SrO+BaO>10% (preferably ≥ 15%). Composition (a) has a lower strain point temperature of above 600 degrees C and composition (b) has a lower strain point temperature of above 570 (preferably above 580 or 600) degrees C.</p> |
