Granted Patent B2

US 12,410,090 · App. 18/203,890 · Granted Sep 9, 2025

Inventors: Timothy Michael Gross (Painted Post, NY); Peter Joseph Lezzi (Corning, NY)

Assignee: CORNING INCORPORATED

C03C3/097C03B27/012C03C3/091

Abstract

Claims (43)

1. A method of making a glass article, comprising:

mixing and melting batch constituents comprising:

from 75 to 90 mol % SiO 2 ;

from 7 to 20 mol % Al 2 O 3 ;

greater than 0 to 20 mol % of at least one alkaline earth oxide selected from the group consisting of MgO, CaO, BaO, or SrO;

from 8 to 20 mol % K 2 O;

greater than 0 to 10 mol % B 2 O 3 , and

0 mol % Na 2 O to form a melt of the glass,

wherein a low temperature coefficient of thermal expansion from 25° C. to 300° C. of the glass is greater than 75×10 −7 ppm/° C., and

wherein a fracture toughness, K IC of the glass is less than 0.65 MP·m 1/2 .

2. The method of claim 1 , further comprising forming the melt into glass sheets.

3. The method of claim 2 , further comprising thermally tempering the glass sheets.

4. The method of claim 3 , further comprising maintaining the melt at temperatures ranging from 1100-1650° C. for times ranging from about 6-16 hours, wherein the glass sheets meet dicing standard ASTM C1048 after the thermal tempering.

5. The method of claim 4 , further comprising annealing the glass sheets at about 500-650° C.

6. The method of claim 5 , wherein during the annealing the glass is held at temperature for about 1 hour and subsequently cooled for at least 6 hours.

7. The method of claim 1 , wherein a high temperature coefficient of thermal expansion of the glass is greater than 250×10 −7 ppm/° C.

8. The method of claim 1 , wherein the glass has a viscosity of 200 kP at a temperature within a range of 1000-1200° C.

9. The method of claim 1 , wherein the glass has a viscosity of 35 kP at a temperature within a range of 1100-1300° C.

10. The method of claim 1 , wherein the mixing comprises mixing from 0.5 to 8 mol % B 2 O 3 .

11. The method of claim 1 , wherein the mixing comprises mixing from 2 to 20 mol % MgO.

12. The method of claim 1 , wherein the mixing comprises mixing from 11 to 20 mol % K 2 O.

13. The method of claim 1 , wherein the glass has a surface compressive stress of at least 250 MPa.

14. The method of claim 1 , wherein the glass meets the dicing standard ASTM C1048.

15. The method of claim 3 , wherein the glass has a depth of compression of at least about 10 microns, and the depth of compression extends up to about 25% into the glass as measured by thickness from surface to a center of the glass.

16. The method of claim 1 , wherein the mixing comprises mixing:

from 7 to 17 mol % Al 2 O 3 ;

from 0 to 10 mol % of the at least one alkaline earth oxide; and

from 8 to 18 mol % K 2 O.

17. The method of claim 1 , wherein

the mixing comprises mixing 0 mol % CaO.

18. A method of making a glass article, comprising:

mixing and melting batch constituents comprising:

from 75 to 90 mol % SiO 2 ;

from 7 to 20 mol % Al 2 O 3 ;

greater than 0 to 20 mol % of at least one alkaline earth oxide selected from the group consisting of MgO, CaO, BaO, or SrO;

from 8 to 20 mol % K 2 O; and

greater than 0 to 2.57 mol % B 2 O 3 to form a melt of the glass,

wherein the glass exhibits a 200 Poise temperature that is within a range of from 1684° C. to 1762° C.

19. The method of claim 1 , wherein

the mixing comprises mixing from greater than 0 to 2.57 mol % B 2 O 3 .

20. The method of claim 18 , wherein

the mixing comprises mixing from 12 to 20 mol % K 2 O, and

the glass exhibits a 200 Poise temperature that is within a range of 1700° C. to 1762° C.

Assignments (1)

Continuity (3)

References Cited (400)