Low viscosity glasses and methods and systems for manufacture

Inventors: Timothy Michael Gross (Corning, NY); Xiaoju Guo (Pittsford, NY); Shawn Rachelle Markham (Harrodsburg, KY); Charlene Marie Smith (Corning, NY); Jae Hyun Yu (Big Flats, NY)

Assignee: CORNING INCORPORATED

C03C3/091 C03C3/083 C03C3/089 C03C3/093 C03C3/097 C03C21/002

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Quick Facts

Patent No.: US 11,945,747
App. No.: 17/185,023
Granted: Apr 2, 2024
Kind: B2

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Abstract

A glass article including any one or several of SiO 2 , Al 2 O 3 , B 2 O 3 , Li 2 O, SnO 2 and a fusion line. The glass article can also include a liquidus viscosity less than or equal to 100 kP. In some embodiments, the glass article includes, on an oxide basis, from 60 mol % to 74 mol % SiO 2 , from 7 mol % to 18 mol % Al 2 O 3 , from 3 mol % to 16 mol % B 2 O 3 , from 0 mol % to 6 mol % Na 2 O, from 0 mol % to 5 mol % P 2 O 5 , from 5 mol % to 11 mol % Li 2 O, less than or equal to 0.2 mol % SnO 2 .

Claims (58)

1. A glass article comprising a glass that comprises on an oxide basis:

from greater than or equal to 60 mol % to less than or equal to 74 mol % SiO 2 ;

from greater than or equal to 7 mol % to less than or equal to 18 mol % Al 2 O 3 ;

from greater than or equal to 3 mol % to less than or equal to 16 mol % B 2 O 3 ;

from greater than or equal to 0 mol % to less than or equal to 5 mol % P 2 O 5 ;

from greater than or equal to 0 mol % to less than or equal to 0.2 mol % SnO 2 ;

from greater than 0 mol % to less than or equal to 6 mol % Na 2 O;

from greater than or equal to 0 mol % to less than 0.1 mol % K 2 O;

from at least 5 mol % to less than or equal to 11 mol % Li 2 O;

from greater than 0 mol % to less than or equal to 6.5 mol % of MgO; and

from greater than 0 mol % to less than or equal to 5 mol % of CaO,

wherein:

(a) the glass article comprises a fusion line as a result of having been produced by a method comprising a fusion draw process; and

(b) the glass of the glass article has a liquidus viscosity that is less than or equal to 300 kP.

2. The glass article of claim 1 wherein the glass comprises from greater than 0 mol % to less than or equal to 5 mol % P 2 O 5 .

3. The glass article of claim 1 wherein the glass has a molar ratio of Al 2 O 3 :(R 2 O+RO) greater than or equal to 0.9, where R 2 O is a sum of alkali metal oxides in mol % and RO is a sum of divalent cation oxides in mol %.

4. The glass article of claim 1 wherein the glass has a liquidus viscosity of less than or equal to 100 kP.

5. The glass article of claim 1 wherein the glass has a liquidus viscosity of less than or equal to 50 kP.

6. The glass article of claim 1 wherein the glass has a liquidus viscosity of less than or equal to 25 kP.

7. The glass article of claim 1 wherein the glass article is strengthened by an ion exchange process such that a compressive stress layer is formed on at least one surface of the glass article.

8. The glass article of claim 7 wherein the glass article is strengthened by an ion exchange process that adds potassium ions to the glass article and the glass article has a potassium depth of layer from greater than or equal to 5 μm to less than or equal to 30 μm.

9. The glass article of claim 7 wherein the glass article has at least one of the following properties:

(i) a depth of compression greater than or equal to 0.15 t, where t is a thickness of the glass article;

(ii) a depth of compression from greater than or equal to 0.15 t to less than or equal to 0.25 t, where t is a thickness of the glass article;

(iii) a central tension from greater than or equal to 30 MPa to less than or equal to 150 MPa;

(iv) a Knoop Scratch Lateral Cracking Threshold of greater than or equal to 5 N to less than or equal to 24 N;

(v) an Indentation Fracture Threshold of greater than or equal to 15 kgf;

(vi) a compressive stress at the surface of its compressive stress layer from greater than or equal to 300 MPa to less than or equal to 950 MPa.

10. A method for producing a glass article comprising:

(I) selecting, melting, and fining batch materials; and

(II) forming the glass article from the melted and fined batch materials;

wherein:

(a) the glass article is formed using a fusion draw process;

(b) the glass of the glass article comprises on an oxide basis from greater than or equal to 60 mol % to less than or equal to 74 mol % SiO 2 ;