Boroalumino silicate glasses

A glass and alkali-free glass technology, applied in glass forming, glass forming, glass manufacturing equipment, etc., can solve the problems of difficulty in obtaining thermodynamically stable glass plates, high cost, low production rate, etc.

Active Publication Date: 2009-12-02
CORNING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, despite the smaller shrinkage of severely annealed glass sheets during downstream processing, such thermodynamically stable glass sheets are still difficult to obtain and require a second heat treatment and / or a manufacturing process with low production rates that can lead to very high costs

Method used

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  • Boroalumino silicate glasses
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  • Boroalumino silicate glasses

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0123] Example 1 and the following Examples 2 and 3 are intended to describe how the present invention is prepared. These embodiments are not meant to be restricted in any way; rather, the embodiments are provided to facilitate those skilled in the art to have the right to use the method considered by the applicant and use this method of consideration. If appropriate, the content described herein is further developed to optimize the glass of the present invention for specific applications.

[0124] Several surprising findings led to the present invention.

[0125] The first is that when the glass is designed without B 2 O 3 In terms of composition, the glass with the best combination of liquidus viscosity, melting temperature, and annealing point tends to have a similar ratio of SiO 2 , Al 2 O 3 , MgO, CaO and SrO. In order to understand this, it is the easiest to consider an example of a glass. For further discussion, the glass also introduces various required components, glass 6...

Embodiment 2

[0142] The examples show the process of testing the composition of the glass to determine whether it is particularly suitable for the melting process. Use [MgO] pred And [SiO 2 ] pred To optimize the glass used in the melting process of the present invention.

[0143] Considering the glass discussed in Example 1, 67SiO 2 -9B 2 O 3 -11Al 2 O 3 -3MgO-7CaO-3SrO. As mentioned above, a simple calculation shows that the oxide composition of the glass is in the following range:

[0144] 64≤SiO 2 ≤68.2;

[0145] 11≤Al 2 O 3 ≤13.5;

[0146] 5≤B 2 O 3 ≤9;

[0147] 2≤MgO≤9;

[0148] 3≤CaO≤9; and

[0149] 1≤SrO≤5.

[0150] Moreover, a simple calculation shows that the expression (MgO+CaO+SrO) / Al 2 O 3 =(3+7+3) / 11=1.18; (SrO+CaO) / Al 2 O 3 =(3+7) / 11=0.91; and CaO / (CaO+SrO)=7 / (7+3)=0.7, in the following range:

[0151] 1.05≤(MgO+CaO+SrO) / Al 2 O 3 ≤1.45;

[0152] 0.67≤(SrO+CaO) / Al 2 O 3 ≤0.92; and

[0153] 0.45≤CaO / (CaO+SrO)≤0.95.

[0154] Using the expression given above, calculate R as follows ...

Embodiment 3

[0171] Example 3 illustrates the process of producing a glass composition using the relationship described in Example 1.

[0172] The process includes the following steps:

[0173] (1) Select the annealing point target;

[0174] (2) Choose R 0 And S 0 Test value

[0175] (3) Use R 0 And S 0 Calculation [MgO] 0 ;

[0176] (4) Use [MgO] 0 Calculation [SiO 2 ] 0 As the target value of MgO;

[0177] (5) Use R 0 , S 0 , [MgO] 0 And [SiO 2 ] 0 Calculation [Al 2 O 3 ] 0 , [CaO] 0 And [SrO] 0 ;

[0178] (6) Calculate B 2 O 3 And use it to calculate SiO 2 , B 2 O 3 , Al 2 O 3 , The renormalized concentration of MgO and CaO; and

[0179] (7) Compare the result with the required density and CTE target value, if necessary, repeat steps 1-6 with new input parameters.

[0180] In order to carry out these steps, we use three empirical formulas describing the dependence of composition on annealing point, thermal expansion coefficient and density, namely:

[0181] Annealing point = 828.3+3.1Al 2 O...

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Abstract

The invention discloses alkali-free glasses having a liquidus viscosity of greater than or equal to about 90,000 poises, the glass comprising SiO 2 Al 2 O 3 , B 2 O 3 , MgO, CaO, and SrO such that, in mole percent on an oxide basis: 64 is less than or equal to SiO2 and SiO2 is less than or equal to 68.2; 11 is less than or equal to Al2O3 and Al2O3 is less than or equal to 13.5; 5 is less than or equal to B2O3 and B2O3 is less than or equal to 9; 2 is less than or equal to MgO and MgO is less than or equal to 9; 3 is less than or equal to CaO and CaO is less than or equal to 9; and 1 is less than or equal to SrO and SrO is less than or equal to 5. The glasses can be used to make a display glass substrate, such as thin film transistor (TFT) display glass substrates for use in active matrix liquid crystal display devices (AMLCDs) and other flat panel display devices.

Description

[0001] Cross reference of related applications [0002] This application claims the priority of U.S. Provisional Application 61 / 130474 filed on May 30, 2008, entitled "Borosaluminosilicate Glass", and the entire contents of which are referred to and cited herein. Technical field [0003] The present invention generally relates to glass, and more particularly relates to boro-aluminosilicate glass, and its preparation method and use. Background technique [0004] Displays are mainly divided into two categories: emissive type (for example, cathode ray tube and plasma display panel (PDP)) and non-emissive type. Liquid crystal displays (LCDs) belong to the latter category. The latter category relies on an external light source, and the display acts only as a light modulator. In the case of a liquid crystal display, the external light source can be either an ambient light source (for reflective displays) or a dedicated light source (for example, found in direct image displays). [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/091C03C3/112C03C3/11C03B17/06G02F1/1333
CPCC03C3/087C03C3/091Y02E20/34
Inventor A·J·埃列森
Owner CORNING INC
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