Ion exchangeable alkali aluminosilicate glass articles
Ion exchangeable glass articles are disclosed. In one embodiment, a glass article formed from alkali aluminosilicate glass which may include Ga 2 O 3 , Al 2 O 3 , Na 2 O, SiO 2 , B 2 O 3 , P 2 O 5 and various combinations thereof. The glass article may generally include about X mol % of Ga 2 O 3 and about Z mol % of Al 2 O 3 , wherein 0≦X≦20, 0≦Z≦25 and 10≦(X+Z)≦25. The glass article may also include from about 5 mol % to about 35 mol % Na 2 O, SiO 2 may be present in an amount from about 40 mol % to about 70 mol % SiO 2 . The glass article may further include Y mol % B 2 O 3 where Y is from 0 to about 10. The glass article may further include (10-Y) mol % of P 2 O 5 . Glass articles formed according to the present invention may be ion-exchange strengthened. In addition, the glass articles may have a low liquid CTE which enables the glass articles to be readily formed into complex shapes.
1. A glass article formed from an alkali-containing glass, the alkali-containing glass comprising:
about X mol % of Ga 2 O 3 , wherein X is from about 1 to about 20;
about Z mol % of Al 2 O 3 , wherein 0≦Z≦25 and 10≦(X+Z)≦25;
from about 5 mol % to about 35 mol % Na 2 O;
from about 40 mol % to about 70 mol % SiO 2 ;
Y mol % of B 2 O 3 , where Y is from 0 to about 10; and
(10-Y) mol % of P 2 O 5 .
2. The glass article of claim 1 , wherein 17≦(X+Z)≦24.
3. The glass article of claim 1 , wherein when the alkali-containing glass includes a non-zero amount of P 2 O 5 ,
Y
(
10
-
Y
)
<
1.6
.
4. The glass article of claim 1 , wherein Y<6.2.
5. The glass article of claim 1 , wherein a softening point of the alkali-containing glass is less than about 870° C.
6. The glass article of claim 1 , wherein the glass article is ion-exchange strengthened such that the glass article has a compressive stress greater than about 625 MPa and a depth of layer greater than about 30 μm.
7. The glass article of claim 6 , wherein the depth of layer is greater than about 45 μm.
8. The glass article of claim 6 , wherein the compressive stress is greater than about 700 MPa.
9. The glass article of claim 1 , wherein the alkali-containing glass has a liquid CTE<30 ppm/° C. at temperatures above a glass transition temperature of the alkali-containing glass.
10. The glass article of claim 1 , wherein the glass article is ion-exchange strengthened such that the glass article has a compressive strength of greater than about 500 MPa and a depth of layer greater than about 10 μm.
11. A glass article formed from an alkali-containing glass, the alkali-containing glass comprising:
about X mol % of Ga 2 O 3 , wherein X is from about 1 to about 20;
about Z mol % of Al 2 O 3 , wherein 0≦Z≦25 and 10≦(X+Z)≦25;
from about 5 mol % to about 35 mol % Na 2 O;
from about 40 mol % to about 70 mol % SiO 2 ;
from about 1 mol % to about 10 mol % B 2 O 3 , wherein the alkali-containing glass has a softening point≦875° C.
12. The glass article of claim 11 , wherein 1≦X≦12.
13. The glass article of claim 11 , wherein X≧4 and Z≧7.
14. The glass article of claim 11 , wherein the glass article comprises ≧4 mol % B 2 O 3 .
15. The glass article of claim 11 , wherein the alkali-containing glass comprises from about 50 mol % to about 65 mol % SiO 2 .
16. The glass article of claim 11 , wherein the alkali-containing glass comprises from about 15 mol % to about 25 mol % Na 2 O.
17. The glass article of claim 11 , wherein the softening point of the alkali-containing glass≦850° C.
18. The glass article of claim 11 , wherein
Na
2
O
(
mol
.
%
)
(
Al
2
O
3
(
mol
.
%
)
+
Ga
2
O
3
(
mol
.
%
)
)
≅
1.
19. A glass article formed from an alkali-containing glass, the alkali-containing glass comprising:
about X mol % of Ga 2 O 3 , wherein X is from about 1 to about 20;
about Z mol % of Al 2 O 3 , wherein 0≦Z≦25 and 10≦(X+Z)≦25;
from about 5 mol % to about 35 mol % Na 2 O;
from about 40 mol % to about 70 mol % SiO 2 ;
from about 1 mol % to about 10 mol % P 2 O 5 , wherein the alkali-containing glass has a softening point≦975° C.
20. The glass article of claim 19 , wherein the glass article comprises ≧4 mol % P 2 O 5 .
21. The glass article of claim 19 , wherein X≧2 and Z≧10.
22. The glass article of claim 21 , wherein X≦10 and Z≦18.
23. The glass article of claim 19 , wherein the softening point of the alkali-containing glass is ≦900° C.
24. A glass article comprising an alkali aluminosilicate glass, the alkali aluminosilicate glass comprising:
from about 10 mol % to about 20 mol % Al 2 O 3 ;
from about 40 mol % to about 70 mol % SiO 2 ;
from about 10 mol % to about 20 mol % Na 2 O;
Y mol % B 2 O 3 , where Y is from 0-5;
(5-Y) mol % P 2 O 5 ; and
from about 1 mol % to about 6 mol % fluorine.
25. The glass article of claim 24 , wherein the glass article is ion-exchange strengthened such that the glass article has a compressive stress greater than about 1000 MPa and a depth of layer greater than about 40 μm.
26. The glass article of claim 24 , wherein a softening point of the alkali aluminosilicate glass is less than about 930° C.