Methods and apparatus for predicting glass dynamics

Patent metadata

Field	Value
Publication number	US-10846446-B2
Application number	US-201916245951-A
Country	US
Kind code	B2
Filing date	Jan 11, 2019
Priority date	Oct 31, 2011
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

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 article comprising:
(I) melting batch materials to produce molten glass; and
(II) forming a glass article from the molten glass;
wherein:
(A) the batch materials comprise a plurality of viscosity-affecting components that become at least part of the glass; and
(B) 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 article is a function of predicted/estimated non-equilibrium viscosity of the glass, which 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 resulted 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. A method of making a glass article comprising:
(I) melting batch materials to produce molten glass; and
(II) forming a glass article from the molten glass;
wherein:
(A) the batch materials comprise a plurality of viscosity-affecting components that become at least part of the glass; and
(B) 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 article is a function of predicted/estimated non-equilibrium viscosity of the glass, which is a function of time, temperature, and composition.

6. The method of claim 5 wherein the predicted/estimated non-equilibrium viscosity of the computer-implemented modeling is additionally a function of fictive temperature.

7. The method of claim 5 wherein the predicted/estimated non-equilibrium viscosity resulted from an equation that comprises both equilibrium and non-equilibrium components that are at least part of separate terms in the equation.

8. The method of claim 7 wherein proportionality of the separate terms in the equation is a function of glass transition temperature of the molten glass.

9. A method of making a glass article comprising:
(I) melting batch materials to produce molten glass; and
(II) forming a glass article from the molten glass;
wherein:
(A) the batch materials comprise a plurality of viscosity-affecting components that become at least part of the glass; and
(B) 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 article is a function of predicted/estimated non-equilibrium viscosity of the glass, which is a function of time, temperature, and composition.

10. The method of claim 9 wherein the predicted/estimated non-equilibrium viscosity of the computer-implemented modeling is additionally a function of fictive temperature.

11. The method of claim 9 wherein the predicted/estimated non-equilibrium viscosity resulted from an equation that comprises both equilibrium and non-equilibrium components that are at least part of separate terms in the equation.

12. The method of claim 11 wherein proportionality of the separate terms in the equation is a function of glass transition temperature of the molten glass.

13. A method of making a glass article comprising:
(I) melting batch materials to produce molten glass; and
(II) forming a glass article from the molten glass;
wherein:
(A) the batch materials comprise a plurality of viscosity-affecting components which become at least part of the glass article; and
(B) the viscosity-affecting components and/or their concentrations were selected at least in part using computer-implemented modeling where compaction of the glass article is predicted/estimated using predicted/estimated non-equilibrium viscosity as a function of both equilibrium and non-equilibrium components, wherein the equilibrium and non-equilibrium components are each in turn functions of fictive temperature and composition, and wherein the equilibrium and non-equilibrium components are each non-zero.

14. The method of claim 13 wherein the non-equilibrium component of the computer-implemented modeling is additionally a function of temperature.

15. The method of claim 14 wherein the predicted/estimated non-equilibrium viscosity resulted from an equation that comprises both equilibrium and non-equilibrium components that are at least part of separate terms in the equation.

16. The method of claim 15 wherein proportionality of the separate terms in the equation is a function of glass transition temperature of the molten glass.

17. The method of claim 16 wherein, in the equation, a logarithm of the non-equilibrium viscosity of the molten glass is related to logarithms of both the equilibrium and non-equilibrium components.

18. The method of claim 17 wherein, in the equation, a decadic logarithm of the non-equilibrium viscosity of the molten glass is related to decadic logarithms of both the equilibrium and non-equilibrium components.

19. A method of making a glass article comprising:
(I) melting batch materials to produce molten glass; and
(II) forming a glass article from the molten glass;
wherein:
(A) the batch materials comprise a plurality of viscosity-affecting components that become at least part of the glass; and
(B) 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 article is a function of time, temperature, and composition.

20. The method of claim 19 wherein the predicted/estimated compaction of the computer-implemented modeling is additionally a function of fictive temperature.

21. The method of claim 19 , further comprising (I)(A) processing the molten glass by float and (I)(B) cooling the molten glass, thereby imparting a temperature profile on the glass article.

22. The method of claim 21 , wherein the glass article is a substrate for a display.

23. A method of making a glass article comprising:
(I) melting batch materials to produce molten glass; and
(II) forming a glass article from the molten glass;
wherein:
(A) the batch materials comprise a plurality of viscosity-affecting components that become at least part of the glass; and
(B) 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 article is a function of time, temperature, and composition.

24. The method of claim 23 wherein the predicted/estimated stress relaxation of the computer-implemented modeling is additionally a function of fictive temperature.

25. The method of claim 23 , further comprising (III) submerging the glass article in a molten salt bath at an elevated temperature and (IV) holding the glass article in the molten salt bath at the elevated temperature, thereby facilitating an ion-exchange process.

26. The method of claim 25 , wherein the glass article is cover glass for a scratch-resistant touch

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

• G06F17/11

  for solving equations {, e.g. nonlinear equations, general mathematical optimization problems (optimization specially adapted for a specific administrative, business or logistic context G06Q10/04)} · CPC title

• C03B1/00

  Preparing the batches (chemical compositions C03C) · CPC title

• C03B18/02

  Forming sheets · CPC title

• G06F30/20 Primary

  Design optimisation, verification or simulation (optimisation, verification or simulation of circuit designs G06F30/30) · CPC title