Rapid forming of glass and ceramics

Patent metadata

Field	Value
Publication number	US-11753347-B2
Application number	US-202017069025-A
Country	US
Kind code	B2
Filing date	Oct 13, 2020
Priority date	Oct 14, 2019
Publication date	Sep 12, 2023
Grant date	Sep 12, 2023

Abstract

A method for finishing a glass or ceramic article includes applying a force to the glass or ceramic article. The force is applied to the glass or ceramic article at least when the glass or ceramic article is at a temperature that is greater than or equal to a creep temperature of the glass or ceramic article. Holding the force to the glass or ceramic article as the glass or ceramic article is cooled to a temperature that is less than the creep temperature of the glass or ceramic article.

First claim

What is claimed is:

1. A method for finishing a glass or ceramic article comprising:
applying a force to the glass or ceramic article, wherein the force is applied to the glass or ceramic article at least when the glass or ceramic article is at a temperature that is greater than or equal to a creep temperature of the glass or ceramic article, the force is applied to the glass or glass ceramic article by a vacuum chuck and drawing a vacuum through the vacuum chuck, and wherein a porous slider is positioned between the glass or ceramic article and the vacuum chuck, and the porous slider is configured so that the glass or ceramic article is in physical contact with the porous slider and the vacuum is drawn through the porous slider and the vacuum chuck; and
holding the force to the glass or ceramic article as the glass or ceramic article is cooled to a temperature that is less than the creep temperature of the glass or ceramic article.

2. The method of claim 1 , wherein the vacuum chuck has a porosity from greater than or equal to 5% and less than or equal to 22% measured using mercury porosimetry.

3. The method of claim 1 , wherein the vacuum chuck has an average pore size from greater than or equal to 5 μm and less than or equal to 40 μm measured by mercury porosimetry.

4. The method of claim 1 , wherein the glass or ceramic article is continuously fed into a furnace that heats the glass or ceramic article to a temperature that is greater than or equal to the creep temperature of the glass or ceramic article.

5. The method of claim 1 , wherein the finished glass or ceramic article has a flatness of less than or equal to 15 μm/in 2 .

6. The method of claim 1 , wherein the finished glass or ceramic article has a surface roughness of greater than or equal to 0.5 μm and less than or equal to 15.0 μm.

7. The method of claim 1 , wherein the vacuum chuck comprises silicon carbide, silicon nitride, or alumina.

8. The method of claim 1 , wherein the porous slider has a porosity from greater than or equal to 5% and less than or equal to 22% measured using mercury porosimetry.

9. The method of claim 1 , wherein the porous slider has an average pore size from greater than or equal to 5 μm and less than or equal to 40 μm measured by mercury porosimetry.

10. The method of claim 1 , wherein
the vacuum chuck is positioned on a first side of the glass or ceramic article, and
an additional force is applied to the glass or ceramic article by an air bearing that is positioned on a second side of the glass or ceramic article, and the second side of the glass or ceramic article is opposite the first side of the glass or ceramic article.

11. The method of claim 10 , wherein a gap between the air bearing and the second surface of the glass or ceramic article is less than or equal to 10 μm.

12. A method for forming a shaped glass or ceramic article comprising:
positioning a glass or ceramic sheet adjacent to a forming tool;
applying a force to the glass or ceramic sheet, wherein the force is applied to the glass or ceramic sheet at least when the glass or ceramic sheet is at a temperature that is greater than or equal to a creep temperature of the glass or ceramic sheet, the force applies a tension to the glass or ceramic article, the tension is applied along two axes, and the force draws the glass or ceramic sheet to the forming tool such that the glass or glass ceramic article is in physical contact with the forming tool; and
holding the force to the glass or ceramic sheet as the glass or ceramic sheet is cooled to a temperature that is less than the creep temperature of the glass or ceramic sheet, thereby forming the shaped glass or ceramic article.

13. The method of claim 12 , wherein the forming tool has a porosity from greater than or equal to 5% and less than or equal to 22% measured using mercury porosimetry.

14. The method of claim 12 , wherein the forming tool has an average pore size from greater than or equal to 5 μm and less than or equal to 40 μm measured by mercury porosimetry.

15. The method of claim 12 , wherein the shaped glass or ceramic article is formed in a time that is less than or equal to 5 minutes.

16. The method of claim 12 , wherein the shaped glass or ceramic article has a surface roughness of greater than or equal to 0.5 μm and less than or equal to 15.0 μm.

Assignees

• Corning Inc

Inventors

• Badding Michael Edward
• Bouton William Joseph
• Timmons Christopher Lee

Classifications

• C03B23/037 Primary

  by drawing · CPC title

• B28B11/243 Primary

  Setting, e.g. drying, dehydrating or firing ceramic articles (B28B11/242 takes precedence) · CPC title

• C04B41/0063 Primary

  Cooling, e.g. freezing · CPC title

• C03B25/00

  Annealing glass products · CPC title

• B28B3/006

  Pressing by atmospheric pressure, as a result of vacuum generation or by gas or liquid pressure acting directly upon the material, e.g. jets of compressed air (moulds for treating with gases or degassing B28B7/44; compacting concrete by means of vacuum in general E04G21/061) · CPC title