Silico-sodo-calcic glass composition, to manufacture substrates for display screen, preferably plasma screen, comprises silicon dioxide, aluminum oxide, zirconium oxide, sodium oxide, potassium oxide, calcium oxide, and strontium oxide

摘要

#CMT# #/CMT# Silico-sodo-calcic glass composition, to manufacture substrates for display screen, preferably plasma screen, comprises silicon dioxide (55-75%), aluminum oxide (1-5%), zirconium oxide (1-5%), sodium oxide (1-5.5%), potassium oxide (1-9%, preferably 1-7.5%), calcium oxide (7-11%), and strontium oxide (3-9%, preferably 4.5-9 %). #CMT# : #/CMT# An independent claim is included for a display screen, preferably plasma screen, comprising two glass substrates separated by a space containing gas-plasma mixture, where at least one of the substrate is constituted of the composition. #CMT#USE : #/CMT# The composition is useful to manufacture substrates for display screen, preferably plasma screen and cut glass sheet in a glass ribbon obtained by flotation of glass on a molten metal bath (all claimed). The composition is useful for manufacturing automobile glazings and for buildings. #CMT#ADVANTAGE : #/CMT# The composition provides improved resistance against scratch and thermal gradients, thus reduces the risk of breaking of glasses, preferably at the edges, and has good optical properties. #CMT#INORGANIC CHEMISTRY : #/CMT# Preferred Components: The weight ratio of aluminum oxide/zirconium oxide is 0.7-2%, preferably 0.7-1.2%. #CMT#ORGANIC CHEMISTRY : #/CMT# Preferred Composition: The composition comprises: low temperature of annealing at least equal to 570[deg] C, preferably equal to 580[deg] C; and a thermal dilation coefficient (alpha 20-300) of 70-90x 10 ->7>/[deg] C, preferably 75-85x 10 ->7>/[deg] C. #CMT#EXAMPLE : #/CMT# Typical composition comprised (in %): silicon dioxide (68.2); aluminum oxide (2.8); zirconium oxide (2.5); sodium oxide (4.8); potassium oxide (6.3); calcium oxide (9.8); and strontium oxide (5.6).