X-ray induced coloration in glass or glass-ceramic articles

Patent metadata

Field	Value
Publication number	US-10865140-B2
Application number	US-201816214642-A
Country	US
Kind code	B2
Filing date	Dec 10, 2018
Priority date	Dec 11, 2014
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

Abstract

Embodiments of the present disclosure are directed to methods for inducing color change in glass and glass-ceramic articles. According to one embodiment, color change may be x-ray induced in glass or glass-ceramic articles. The method for x-ray inducing color change may include exposing the glass or glass-ceramic article to x-rays at a temperature of up to 200° C. to induce a colored area in the glass or glass-ceramic article. The glass or glass-ceramic article may comprise: 50-85 mole % SiO2; 5-25 mole % Al2O3; 0-15 mole % P2O5; 0-15 mole % B2O3; 5-25 mole % R2O, wherein R2O═Li2O+Na2O+K2O.

First claim

What is claimed is:

1. A method of inducing a color change in a glass or glass-ceramic article, the method comprising:
exposing the glass or glass-ceramic article to x-rays at a temperature of up to 200° C. to induce a colored area in the glass or glass-ceramic article, wherein the glass or glass-ceramic article comprises: 50-85 mole % SiO 2 ; 5-25 mole % Al 2 O 3 ; 0-15 mole % P 2 O 5 ; 0-15 mole % B 2 O 3 ; 10-18 mole % Na 2 O; and 10-25 mole % R 2 O, wherein R 2 O═Li 2 O+Na 2 O+K 2 O.

2. The method of claim 1 , wherein the color change is achieved without additional heating after x-ray exposure.

3. The method of claim 1 , wherein the glass or glass-ceramic article is x-rayed at a temperature of up to 120° C.

4. The method of claim 1 , wherein the glass or glass-ceramic article comprises 2-10 mole % B 2 O 3 .

5. The method of claim 1 , wherein the glass or glass-ceramic article comprises 2-10 mole % P 2 O 5 .

6. The method of claim 1 , wherein the glass or glass-ceramic article comprises 55-75 mole % SiO 2 .

7. The method of claim 1 , wherein the glass or glass-ceramic article comprises 10-20 mole % Al 2 O 3 .

8. The method of claim 1 , wherein the glass or glass-ceramic article comprises 0.2 to 1.0 mole % coloring agent.

9. The method of claim 1 , wherein the glass or glass-ceramic article further comprises 0.1 to 5 mole % of at least one coloring agent.

10. The method of claim 9 , wherein the coloring agent is chosen from CuO, MnO 2 , Ag 2 O, SnO 2 , or combinations thereof.

11. The method of claim 1 , wherein the glass or glass-ceramic article prior to x-ray exposure is colorless.

12. The method of claim 1 , wherein the glass or glass-ceramic article comprises −20 mol %<R 2 O+RO—(Al 2 O 3 +P 2 O 5 +B 2 O 3 )<20 mol %, wherein RO═MgO+CaO+SrO+BaO+ZnO.

13. The method of claim 1 , wherein the glass or glass-ceramic article comprises −10 mol %<R 2 O+RO—(Al 2 O 3 +P 2 O 5 +B 2 O 3 )<10 mol %, wherein RO═MgO+CaO+SrO+BaO+ZnO.

14. The method of claim 1 , further comprising adding an x-ray mask over the glass or glass-ceramic article prior to x-ray exposure, wherein the x-ray mask produces a color change pattern in the glass or glass-ceramic article upon x-ray exposure.

15. The method of claim 1 , further comprising reducing substantially the color change in the glass or glass-ceramic article by performing one or more melting steps.

16. The method of claim 1 , wherein the glass or glass-ceramic article has a thickness ≤1.5 mm.

17. The method of claim 1 , further providing the glass or glass-ceramic article, wherein providing the glass or glass-ceramic article comprises down-drawing the glass or glass-ceramic article.

18. The method of claim 17 , wherein down-drawing the glass or glass-ceramic article comprises fusion drawing the glass or glass-ceramic article.

19. The method of claim 17 , wherein providing the glass or glass-ceramic article comprises thermally or chemically strengthening the glass or glass-ceramic article.

20. The method of claim 19 , wherein the glass or glass-ceramic article is chemically strengthened and has a compressive layer extending from at least one surface of the glass or glass-ceramic article to a depth of layer of at least 20 μm into the glass or glass-ceramic article, the compressive layer having a maximum compressive stress of at least 200 MPa.

Assignees

• Corning Inc

Inventors

• Baum Jr John F
• Borrelli Nicholas Francis
• Card Candy Elizabeth
• Dejneka Matthew John
• Fanning Eileen Marie
• Fitzsimmons Karen Estelle

Classifications

• C03C3/062 Primary

  with less than 40% silica by weight · CPC title

• C03C3/085

  containing an oxide of a divalent metal · CPC title

• C03C10/0018

  containing SiO2, Al2O3 and monovalent metal oxide as main constituents · CPC title

• C03C23/003 Primary

  by X-rays · CPC title

• C03C3/064 Primary

  containing boron · CPC title