Transparent or transparent colored lithium aluminum silicate glass ceramic articles having adapted thermal expansion and use thereof

Patent metadata

Field	Value
Publication number	US-9446982-B2
Application number	US-201113811798-A
Country	US
Kind code	B2
Filing date	May 17, 2011
Priority date	Jul 23, 2010
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

Transparent or transparent dyed lithium aluminum silicate (LAS) glass ceramic material is provided that has an adapted thermal expansion. The material includes high-quartz mixed crystals as the predominant crystalline phase, and a thermal expansion between room temperature and 700° C. from 1.0 to 2.5·10 −6 /K.

First claim

The invention claimed is:

1. A transparent or transparent colored lithium aluminum silicate (LAS) glass-ceramic article, comprising a glass-ceramic containing β-quartz solid solution as predominant crystal phase, wherein the glass-ceramic comprises in % by weight on an oxide basis:
Li 2 O 2.0-<3.0;
MgO 1.56-3;
Al 2 O 3 19-23;
SiO 2 60-69;
TiO 2 0.5-6.0;
ZrO 2 0-<2.0;
SnO 2 0.1-0.6;
ZnO not more than 3;
P 2 O 5 0-3;
ΣNa 2 O+K 2 O 0-2;
ΣCaO+SrO+BaO 0.2-4;
ΣTiO 2 +ZrO 2 +SnO 2 3-6; and
a condition that MgO/Li 2 O>0.4, and has a thermal expansion in the range from room temperature to 700° C. of from 1.0 to 2.5·10 −6 /K; and
an inorganic decoration on the glass-ceramic, the inorganic decoration having a thermal expansion that is different from the thermal expansion of the glass-ceramic of less than 4·10 −6 /K in the range from room temperature to 300° C.

2. The transparent or transparent colored lithium aluminum silicate glass-ceramic article as claimed in claim 1 , wherein the thermal expansion in the range from room temperature to 700° C. is from 1.3 to 1.8·10 −6 /K.

3. The transparent or transparent colored lithium aluminum silicate glass-ceramic article as claimed in claim 1 , wherein the glass-ceramic further comprises a refining agent selected from the group consisting of Sb 2 O 3 and As 2 O 3 in an amount of from 0.1 to 2% by weight.

4. The transparent or transparent colored lithium aluminum silicate glass-ceramic article as claimed in claim 1 , wherein the glass-ceramic does not include arsenic oxide except for unavoidable traces.

5. The transparent or transparent colored lithium aluminum silicate glass-ceramic article as claimed in claim 4 , wherein the glass-ceramic does not include antimony oxide except for unavoidable traces.

6. The transparent or transparent colored lithium aluminum silicate glass-ceramic article as claimed in claim 1 , wherein the glass-ceramic does not include antimony oxide except for unavoidable traces.

7. The transparent lithium aluminum silicate glass-ceramic article as claimed in claim 1 , further comprising a light transmission of greater than 80%, wherein the glass-ceramic consists essentially of in % by weight on an oxide basis:
Li 2 O 2.0-<3.0;
ΣNa 2 O+K 2 O 0.1-1.5;
MgO 1.56-2.6;
ΣCaO+SrO+BaO 0.2-4;
ZnO not more than 3;
B 2 O 3 0-2;
Al 2 O 3 19-23;
SiO 2 60-69;
TiO 2 0.5-2.5;
ZrO 2 0-<2;
P 2 O 5 0-3;
SnO 2 0.1-0.6;
ΣTiO 2 +ZrO 2 +SnO 2 3-6;
Nd 2 O 3 0-0.4; and
Fe 2 O 3 <0.03, wherein the condition MgO/Li 2 O is >0.5.

8. The transparent lithium aluminum silicate glass-ceramic article as claimed in claim 7 , further comprising a refining agent selected from the group consisting of Sb 2 O 3 and As 2 O 3 in amounts of from 0.1 to 2% by weight.

9. The transparent colored lithium aluminum silicate glass-ceramic article as claimed in claim 1 , further comprising a light transmission of less than 5%, wherein the glass-ceramic consists essentially of in % by weight on an oxide basis:
Li 2 O 2.0-<3.0;
ΣNa 2 O+K 2 O 0.1-1.5;
MgO 1.56-2.6;
ΣCaO+SrO+BaO 0.2-4;
ZnO not more than 3;
B 2 O 3 0-2;
Al 2 O 3 19-23;
SiO 2 60-69;
ZrO 2 0-<2;
P 2 O 5 0-3;
SnO 2 0.1-0.6; and
ΣTiO 2 +ZrO 2 +SnO 2 3-6;
V 2 O 5 0.01-0.06, wherein the condition MgO/Li 2 O is >0.5.

10. The transparent lithium aluminum silicate glass-ceramic article as claimed in claim 9 , further comprising a refining agent selected from the group consisting of Sb 2 O 3 and As 2 O 3 in amounts of from 0.1 to 2% by weight.

11. The transparent colored lithium aluminum silicate glass-ceramic article as claimed in claim 1 , further comprising a processing temperature P T below 1320° C., an upper devitrification limit at least 15° C. below P T , a light transmission of less than 5%, and the glass-ceramic comprising in % by weight on an oxide basis:
Li 2 O 2.0-<3.0;
Na 2 O 0.1-1;
K 2 O 0.1-1;
ΣNa 2 O+K 2 O 0.2-1.5;
MgO 1.56-2.6;
CaO 0.1-1;
SrO 0-1;
BaO 0-3;
ΣCaO+SrO+BaO 0.2-4;
ZnO 0-2.5;
B 2 O 3 0-1;
Al 2 O 3 19-23;
SiO 2 62-67;
TiO 2 2.5-6;
P 2 O 5 0-1.5;
SnO 2 0.1-0.4;
ΣTiO 2 +ZrO 2 +SnO 2 4.2-6;
V 2 O 5 0.01-0.05;
Fe 2 O 3 0.05-0.3; and
a condition that Fe 2 O 3 /V 2 O 5 >2, wherein the condition that MgO/Li 2 O is >0.5, and wherein the composition is without the refining agents arsenic oxide and antimony oxide.

12. The transparent or transparent colored lithium aluminum silicate glass-ceramic article as claimed in claim 1 , comprising a form of a plate.

13. The transparent or transparently colored lithium aluminum silicate glass-ceramic article as claimed in claim 12 , wherein the plate is coated on at least one side over its entire area or part of its area by the inorganic decoration.

14. The transparent or transparently colored lithium aluminum silicate glass-ceramic article as claimed in claim 13 , wherein the coated plate has a bending tensile strength of greater than 50 MPa at a layer thickness of the inorganic decoration of at least 3 urn.

15. The transparent or transparently colored lithium aluminum silicate glass-ceramic article as claimed in claim 13 , wherein the inorganic decoration has a layer thickness of greater than 5 μm with a bending tensile strength of the coating plate being at least 35 MPa.

16. The transparent or transparent colored lithium aluminum glass-ceramic article as claimed in claim 1 , wherein the article is configured for use as a device selected from the group consisting of a chimney sight window, a fire protection glazing, a display panel, a safety glazing, a cooking surface having a visually opaque colored underside coating in transparent form, and a cooking surface in transparent colored form.

17. The transparent or transparent colored lithium aluminum silicate glass-ceramic article as claimed in claim 1 , wherein the article is configured for use as a cooking surface, wherein the cooking surface has a light transmission in a visible region of from 0.5 to 2.5% and a transmission of greater than 0.1% in a region of visible light over the entire wavelength range from 450 nm upward.

18. The transparent or transparent colored lithium aluminum silicate glass-ceramic article as claimed in claim 17 , comprising transmission values of:
>0.15% at 450 nm;
>0.15% at 500 nm;
>0.25% at 550 nm;
2-12% at 630 nm; and
a light transmission in the visible region of 0.7-2.5%.

19. The transparent or transparent colored lithium aluminum silicate glass-ceramic article as claimed in claim 17 , comprising a temperature difference resistance of less than 600° C.

20. The transparent or transparent colored lithium aluminum silicate glass-ceramic article as claimed in claim 1 , wherein the glass-ceramic further comprises Sb 2 O 3 in an amount of from 0.1 to 2% by weight.

21. The transparent or transparent colored lithium aluminum silicate glass-ceramic article as claimed in claim 1 , wherein the condition that MgO/Li 2 O is ≦0.66.

Assignees

• Siebers Friedrich
• Weiss Evelin
• Schoenberger Klaus
• Schott Ag

Inventors

• Siebers Friedrich
• Weiss Evelin
• Schoenberger Klaus

Classifications

• C03C14/00

  Glass compositions containing a non-glass component, e.g. compositions containing fibres, filaments, whiskers, platelets, or the like, dispersed in a glass matrix (devitrified glass ceramics C03C10/00) · CPC title

• F24B13/004

  Doors specially adapted for stoves or ranges (doors for open fires F24B1/192) · CPC title

• C03C10/0054 Primary

  containing PbO, SnO2, B2O3 · CPC title

• C03C10/0027

  containing SiO2, Al2O3, Li2O as main constituents · CPC title

• C03C10/0045

  containing SiO2, Al2O3 and MgO as main constituents · CPC title