CTE - Low CTE Alkali-Free Boroaluminosilicate Glass Compositions and Glass Articles Comprising the Same

摘要

Low CTE glass compositions and glass articles formed therefrom are described. In one embodiment, the glass composition is from about 60 mol.% To about 66 mol.% SiO ₂ as a glass network former; About 7 mol.% To about 10 mol.% Al ₂ O ₃ ; And about 14 mol.% To about 18 mol.% B ₂ O ₃ . The glass composition may further include about 9 mol.% To about 16 mol.% Alkaline earth oxide. The alkaline earth oxide contains at least CaO. The CaO may be present in the glass composition at a concentration of about 3 mol.% To about 12 mol.%. The glass composition is free of alkali metals. The glass composition has a coefficient of thermal expansion of an average of 40x10 ^-7 / ° C or less over a temperature range of 20 ° C to 300 ° C. The glass composition is particularly suitable for use as a glass cladding layer in laminated glass articles.