LOW CTE ALKALI-FREE BOROALUMINOSILICATE GLASS COMPOSITIONS AND GLASS ARTICLES COMPRISING THE SAME

摘要

Low CTE glass compositions and glass articles formed from the same are described. In one embodiment, a glass composition includes from about 60 mol.% to about 66 mol.% SiO2; from about 7 mol.% to about 10 mol.% AI2O3; and from about 14 mol.% to about 18 mol.% B2O3 as glass network formers. The glass composition may further include from about 9 mol.% to about 16 mol.% alkaline earth oxide. The alkaline earth oxide includes at least CaO. The CaO may be present in the glass composition in a concentration from about 3 mol.% to about 12 mol.%. The glass composition is free from alkali metals. The glass composition has a coefficient of thermal expansion which is less than or equal to 40x10-7/°C averaged over the temperature range from about 20°C to 300°C. The glass composition is particularly well suited for use as a glass cladding layer in a laminated glass article.