Alkali free glass

A technology of non-alkali glass and photoelastic constant, which is applied in the field of non-alkali glass, can solve the problems such as the deterioration of film properties, and achieve the effect of not easy to color unevenness, high strain point, and not easy to bend
CN105555725BActive Publication Date: 2020-04-14ASAHI GLASS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ASAHI GLASS CO LTD
Publication Date
2020-04-14

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Abstract

　The present invention relates to non-alkali glass having a strain point of 680 to 735°C, an average thermal expansion coefficient at 50 to 350°C of 30 × 10-7 to 43 × 10-7 / °C, and a specific gravity of 2.60 or lower; and containing 58 to 65% SiO2, 18 to 22% Al2O3, 3 to 8% B2O3, 0 to 1.3% MgO, 6.3 to 10% CaO, 1.7 to 5% SrO, 0.5 to 5% BaO, and 0 to 2% ZrO2 by mass percentages based on oxides, where MgO + CaO + SrO + BaO is 12 to 23%, MgO / CaO is 0 to 0.2, MgO / (SrO + BaO) is 0 to 0.4, and SrO / BaO is 1.2 to 1.6.
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Description

technical field

[0001] The present invention relates to alkali-free glass. More specifically, it relates to an alkali-free glass suitable as various substrate glasses for displays, substrate glasses for photomasks, etc., which does not substantially contain alkali metal oxides, and which can be formed by a float method or a fusion method. Background technique

[0002] Conventionally, various glass plates (glass substrates) for displays, especially glass used for glass plates on which thin films such as metals or oxides are formed on the surface, have required the following characteristics.

[0003] (1) When the glass contains an alkali metal oxide, the alkali metal ions diffuse into the thin film to degrade the film properties of the thin film. Therefore, it is required that the glass does not substantially contain alkali metal ions.

[0004] (2) When the glass sheet is exposed to high temperature in the film forming process, a high strain point is required in order to mini...

Claims

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