| 摘要 |
The invention relates to the field of display screens, especially plasma screens. One subject of the invention is a glass composition which comprises the constituents below in the following weight proportions: SiO2  55-75%; Al2O3   1-5%; ZrO2   1-5%; Na2O   1-5.5%; K2O   1-9%, preferably 1-8.5%, and advantageously   1-7.5%; CaO   7-11%; and SrO   3-9%, preferably 3.5-9%, and advantageously 4.5-9%, said composition having an Al2O3/ZrO2 weight ratio varying from 0.7 to 1.8, preferably from 0.7 to 1.2. The substrates obtained have a strain point at least equal to 570° C. and a coefficient of thermal expansion α20-300 between 70 and 90×10−7/° C. |
