Method for producing a ceramizable green glass component, and ceramizable green glass component, and glass ceramic article

Patent metadata

Field	Value
Publication number	US-10851009-B2
Application number	US-201514926570-A
Country	US
Kind code	B2
Filing date	Oct 29, 2015
Priority date	Oct 29, 2014
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

A method for producing ceramizable green glass components provided, as well as apparatus for performing such method and ceramizable green glass components producible by such method. The method is a redrawing process in which a preform is heated, in a deformation zone, to a temperature that enables redrawing of the glass. The deformation zone is particularly small, which permits redrawing of the ceramizable green glass bodies while avoiding ceramization during the redrawing. The method provides plate-like or sheet-like green glass components that have a particularly smooth surface.

First claim

What is claimed is:

1. A method for producing a glass ceramic article, comprising the steps of:
preparing a glass melt of ceramizable glass;
producing, from the glass melt, a ceramizable green glass body as a preform;
providing the preform to a redrawing apparatus;
heating at least a portion of the preform;
redrawing the preform into a ceramizable green glass component, wherein the ceramizable green glass component has a crystalline content of less than 20 vol%.

2. The method as claimed in claim 1 , wherein the crystalline content is less than 10 vol%.

3. The method as claimed in claim 1 , wherein the ceramizable green glass component has a crystalline content of less than 2.5 vol%.

4. The method as claimed in claim 1 , wherein the preform has a thickness D, a width B, and a length L, and wherein the green glass component has a thickness d, a width b, and a length l, and wherein a width-to-thickness ratio changes due to the redrawing.

5. The method as claimed in claim 4 , wherein the redrawing develops a deformation zone that has a height H of not more than 50*D, the deformation zone being a portion of the preform having a thickness between 0.95*D and 1.05*d.

6. The method as claimed in claim 5 , wherein the height H is not more than 6*D.

7. The method as claimed in claim 5 , wherein the step of heating further comprises:
heating the preform to a first temperature below a crystallization temperature and below a softening point of the green glass; and
heating the preform to a second temperature above the softening point in the deformation zone.

8. The method as claimed in claim 1 , wherein the ceramizable glass is selected from the group consisting of barium titanate glass, lithium aluminum silicate glass, lithium silicate glass, magnesium aluminosilicate glass, zinc aluminosilicate glass, magnesium silicate glass, sodium aluminosilicate glass, potassium aluminosilicate glass, phosphate glass, and calcium aluminosilicate glass.

9. The method as claimed in claim 1 , wherein the ceramizable glass comprises a composition, in mol%:
SiO 2 5-20;
Al 2 O 3 4-15;
B 2 O 3 0-5;
BaO 20-45;
TiO 2 20-60;
CaO 0-5;
SrO 0-10;
CeO 2 0-5;
ZrO 2 0-10;
La 2 O 3 0-40;
MnO 2 0-5;
Y 2 O 3 0-5; and
Nb 2 O 3 0-30.

10. The method as claimed in claim 1 , wherein the ceramizable glass comprises a composition, in mol%:
Al 2 O 3 3-12;
BaO 30-45;
B 2 O 3 0-5;
La 2 O 3 0-5;
CeO 2 0-5;
SiO 2 5-25;
TiO 2 25-42;
CaO 0-5;
ΣAl 2 O 3 +B 2 O 3 +SiO 2 +P 2 O 5 15-30;
ΣTiO 2 +ZrO 2 +Nb 2 O 3 +V 2 O 5 +HfO 2 +Sc 2 O 3 20-50; and
ΣBaO+CaO+SrO+CeO 2 +RE 2 O 3 30-50.

11. The method as claimed in claim 1 , wherein the ceramizable glass comprises a composition, in mol%:
Al 2 O 3 5-15;
BaO 20-30;
La 2 O 3 0-10;
CeO 2 0-2;
SiO 2 5-20;
TiO 2 40-60;
ZrO 2 5-10;
ΣAl 2 O 3 +B 2 O 3 +SiO 2 +P 2 O 5 15-30;
ΣTiO 2 +ZrO 2 +Nb 2 O 3 +V 2 O 5 +HfO 2 +Sc 2 O 3 30-55; and
ΣBaO+CaO+SrO+CeO 2 +RE 2 O 3 25-40,
wherein RE is one or more rare earth elements having atomic numbers selected from the group consisting of 39 and from 57 to 71.

12. The method as claimed in claim 1 , wherein the ceramizable glass comprises the following components, in % of cations:

Si 4+
45 to 65;

Crystal agonists

Li +
25 to 40;

K +
0 to 8;

Na +
0 to 8;

Crystal antagonists

B 3+
0 to 5;

Al 3+
 0 to 10;

Zn 2+
0 to 4;

Nucleating agents

Ce 3+ /Ce 4+
>0 to 0.3; and

Ag +
 >0 to 0.5.

13. The method as claimed in claim 1 , wherein the ceramizable green glass component comprises a thickness d of less than 2000 μm.

14. The method as claimed in claim 1 , wherein the ceramizable green glass component comprises a thickness d of less than less than 10 μm.

15. The method as claimed in claim 1 , wherein the ceramizable green glass component comprises a thickness-to-width ratio d/b of not more than 1:200.

16. The method as claimed in claim 1 , wherein the ceramizable green glass component comprises a thickness-to-width ratio d/b of not more than 1:200,000.

17. The method as claimed in claim 1 , wherein the ceramizable green glass component comprises a surface having at least one section with a fire-polished surface quality of R a ≤20 nm.

18. The method of claim 17 , further comprising configuring the ceramizable green glass component to a shape with two faces and a peripheral edge, and wherein the surface having the at least one section with the fire-polished surface is at least one of the two faces.

19. The method of claim 1 , further comprising subjecting the ceramizable green glass component to a ceramization process, with or without intermediate processing, after having been cooled to less than 300 ° C., wherein during the ceramization process the ceramizable green glass component is reheated and ceramized to produce the glass ceramic article.

20. The method of claim 19 , wherein the ceramization process provides the glass ceramic article with a crystalline content of at least 20 vol%.

21. The method of claim 19 , wherein the ceramization process provides the glass ceramic article with a crystalline content of at least 90 vol%.

22. The method of claim 19 , further comprising configuring the glass ceramic article for a use selected from the group consisting of a dielectric component in a capacitor, an antenna, an interposer in an electronic component, a separator in a battery, a substrate for a thin film battery, a flexible substrate for a display, a mask or filter for a display, a substrate for a high-temperature deposition processes, a cov

Assignees

• Schott Ag

Inventors

• Hunzinger Bernhard
• Moseler Doris
• Büllesfeld Frank
• Lange Ulrich

Classifications

• C03B32/02

  Thermal crystallisation, e.g. for crystallising glass bodies into glass-ceramic articles {(C03B27/012 takes precedence)} · CPC title

• C03C10/00

  Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition · CPC title

• C03C10/0036

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

• C03C10/0009

  containing silica as main constituent · CPC title

• C03C3/095

  containing rare earths · CPC title