Methods and apparatus for predicting glass dynamics

Patent metadata

Field	Value
Publication number	US-11580277-B2
Application number	US-202017066799-A
Country	US
Kind code	B2
Filing date	Oct 9, 2020
Priority date	Oct 31, 2011
Publication date	Feb 14, 2023
Grant date	Feb 14, 2023

Abstract

Computer-implemented methods and apparatus are provided for predicting/estimating (i) a non-equilibrium viscosity for at least one given time point in a given temperature profile for a given glass composition, (ii) at least one temperature profile that will provide a given non-equilibrium viscosity for a given glass composition, or (iii) at least one glass composition that will provide a given non-equilibrium viscosity for a given time point in a given temperature profile. The methods and apparatus can be used to predict/estimate stress relaxation in a glass article during forming as well as compaction, stress relaxation, and/or thermal sag or thermal creep of a glass article when the article is subjected to one or more post-forming thermal treatments.

First claim

What is claimed is:

1. A method of making a glass, comprising:
melting batch materials to produce molten glass; and
cooling the molten glass;
wherein the batch materials comprise a plurality of viscosity-affecting components which become at least part of the glass; and
wherein the viscosity-affecting components and/or their concentrations were selected at least in part using computer-implemented modeling where predicted/estimated non-equilibrium viscosity of the glass is a function of time, temperature, and composition.

2. The method of claim 1 , wherein the predicted/estimated non-equilibrium viscosity of the computer-implemented modeling is additionally a function of fictive temperature.

3. The method of claim 1 , wherein the predicted/estimated non-equilibrium viscosity results from an equation that comprises both equilibrium and non-equilibrium components that are at least part of separate terms in the equation.

4. The method of claim 3 , wherein proportionality of the separate terms in the equation is a function of glass transition temperature of the molten glass.

5. The method of claim 1 , wherein the batch materials comprise oxides.

6. The method of claim 1 , wherein the molten glass comprises a silicate melt.

7. The method of claim 1 , further comprising mixing the batch materials.

8. The method of claim 1 , further comprising fining the molten glass.

9. The method of claim 1 , further comprising processing the molten glass by float.

10. The method of claim 1 , wherein the time and the temperature of the predicted/estimated non-equilibrium viscosity of the computer-implemented modeling more specifically comprise a thermal history.

11. A method of making glass, comprising:
melting batch materials to produce molten glass; and
cooling the molten glass;
wherein the batch materials comprise a plurality of viscosity-affecting components that become at least part of the glass; and
wherein the viscosity-affecting components and/or their concentrations were selected at least in part using computer-implemented modeling where predicted/estimated compaction of the glass is a function of time, temperature, and composition.

12. The method of claim 11 , wherein the predicted/estimated compaction of the computer-implemented modeling is additionally a function of fictive temperature.

13. The method of claim 11 , wherein the batch materials comprise oxides; and wherein the molten glass comprises a silicate melt.

14. The method of claim 11 , further comprising mixing the batch materials; fining the molten glass; and processing the molten glass by float.

15. A method of making glass, comprising:
melting batch materials to produce molten glass; and
cooling the molten glass;
wherein the batch materials comprise a plurality of viscosity-affecting components that become at least part of the glass; and
wherein the viscosity-affecting components and/or their concentrations were selected at least in part using computer-implemented modeling where predicted/estimated stress relaxation of the glass is a function of time, temperature, and composition.

16. The method of claim 15 , wherein the predicted/estimated stress relaxation of the computer-implemented modeling is additionally a function of fictive temperature.

17. The method of claim 15 , wherein the batch materials comprise oxides; and wherein the molten glass comprises a silicate melt.

18. The method of claim 15 , further comprising mixing the batch materials; fining the molten glass; and processing the molten glass by float.

19. A method of making glass comprising:
melting batch materials to produce molten glass; and
cooling the molten glass;
wherein the batch materials comprise a plurality of viscosity-affecting components that become at least part of the glass; and
wherein the viscosity-affecting components and/or their concentrations were selected at least in part using computer-implemented modeling where predicted/estimated thermal sag or thermal creep of the glass is a function of time, temperature, and composition.

20. The method of claim 19 , wherein the predicted/estimated thermal sag or thermal creep of the computer-implemented modeling is additionally a function of fictive temperature.

21. The method of claim 19 , wherein the batch materials comprise oxides; and wherein the molten glass comprises a silicate melt.

22. The method of claim 19 , further comprising mixing the batch materials; fining the molten glass; and processing the molten glass by float.

Assignees

• Corning Inc

Inventors

• Allan Douglas Clippinger
• Ellison Adam James
• Guo Xiaoju
• Kiczenski Timothy James
• Mauro John Christopher
• Potuzak Marcel

Classifications

• C03B5/24 Primary

  Automatically regulating the melting process · CPC title

• C03B18/02

  Forming sheets · CPC title

• C03B32/00

  Thermal after-treatment of glass products not provided for in groups {C03B19/00} , C03B25/00 - C03B31/00 {or C03B37/00}, e.g. crystallisation, eliminating gas inclusions or other impurities; {Hot-pressing vitrified, non-porous, shaped glass products} · CPC title

• G06F2111/10

  Numerical modelling · CPC title

• C03B17/064

  by the overflow downdraw fusion process; Isopipes therefor · CPC title