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Method for producing alkali-free glass

An alkali-free glass, glass technology, applied in glass production and other directions, can solve problems such as strain point reduction

Active Publication Date: 2016-02-10
ASAHI GLASS CO LTD
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Problems solved by technology

However, B 2 o 3 Has a tendency to lower the strain point

Method used

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  • Method for producing alkali-free glass
  • Method for producing alkali-free glass
  • Method for producing alkali-free glass

Examples

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Embodiment

[0110] Raw materials were prepared to form glasses in Tables 1, 2, 4, and 5, and melted at a temperature of 1650° C. using a platinum crucible. At the time of melting, stirring was performed using a platinum stirrer to homogenize the glass. Next, the molten glass is poured out, shaped into a plate, and cooled slowly.

[0111] Tables 1, 2, 4, and 5 show the glass composition (unit: mass %), strain point (unit: °C) (measured by the fiber method described in JIS R3103), and glass transition of Examples 1 to 17. Temperature Tg (unit: °C), average coefficient of thermal expansion from 50 °C to 350 °C (unit: ×10 -7 / ℃), specific gravity (unit: g / cm 3 ) (measured by Archimedes method), Young's modulus (unit: GPa) (measured by ultrasonic method), specific modulus (unit: GPa·cm 3 / g), the temperature T that becomes the reference value of solubility as the high-temperature viscosity value 2 (glass viscosity η becomes 10 2 Poise temperature, unit: °C), and temperature T which become...

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Abstract

PROBLEM TO BE SOLVED: To provide an alkali-free glass which has a high strain point, a high Young's modulus and excellent solubility during producing and can be easily subjected to float molding.SOLUTION: There is provided an alkali-free glass which has a Young's modulus of 87 GPa or more, a strain point of 680 DEG C or more and an average thermal expansion coefficient at 50 to 350 DEG C of 3010to 4710 / DEG C, comprises, by mass% on the basis of oxide, 55 to 69 of SiO, 17 to 27 of AlO, 0 to 3 of BO, 0 to 20 of MgO, 2 to 20 of CaO, 0 to 2 of SrO, 0 to 2 of BaO and 0.01 to 1 of SnOand satisfies [SiO]6.7+[AlO]+[BO]4.4-458<=0, in which SiO+AlO+MgO+CaO is 95 or more and MgO+CaO+SrO+BaO is 12 to 2

Description

technical field [0001] The present invention relates to an alkali-free glass that does not substantially contain alkali metal oxides and is capable of float forming and is suitable as a substrate glass for a display and a substrate glass for a photomask used in the manufacture of various flat panel displays (FPDs) and its production method. Background technique [0002] Conventionally, various substrate glasses for displays, especially substrate glasses having a metal or oxide thin film formed on the surface, for example, as disclosed in Patent Document 1, have required the following characteristics. [0003] (1) If an alkali metal oxide is contained, the alkali metal ions diffuse into the thin film to degrade the film properties, so the alkali metal ion should not be substantially contained. [0004] (2) When exposed to high temperature in the thin film forming process, in order to minimize the shrinkage (thermal shrinkage) accompanying the deformation of the glass and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/087C03C3/091C03C1/00
CPCY02P40/57
Inventor 野村周平小野和孝德永博文
Owner ASAHI GLASS CO LTD
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