Glasses for display panels and photovoltaic devices

• US 6,060,168 A
• Filed: 11/24/1997
• Issued: 05/09/2000
• Est. Priority Date: 12/17/1996
• Status: Expired

• Current Assignee: Corning Incorporated
• Original Assignee: Corning Incorporated
• Inventors: Kohli, Jeffrey T.
• Primary Examiner(s): Jones, Deborah
• Assistant Examiner(s): STEIN, STEPHEN J
• Application Number:
  US08/977,413
• Time in Patent Office: 897 Days
• Field of Search: 501/65, 501/66, 501/69, 501/70, 501/32, 428/428, 428/432, 428/702, 65/136.2, 313/523
• US Class Current: 428/428
• CPC Class Codes: C03C 3/091 containing aluminium

Abstract

An aluminosilicate glass having a composition consisting essentially of, as calculated in weight percent on an oxide basis, of 58-70% SiO₂, 12-22% Al₂ O₃, 3-15% B₂ O₃, 2-12% CaO, 0-3% SrO, 0-3% BaO, 0-8% MgO, 10-25% MCSB (i.e., MgO+CaO+SrO+BaO), and SrO and BaO in combination being less than 3%.

Claims

1. A substrate for a flat panel display or photovoltaic device wherein said substrate is comprised of a flat, transparent glass exhibiting a linear coefficient of thermal expansion (CTE) over the temperature range 0-300°

C. between 30-40×

10^-7 /°

C. and a strain point over 600°

C., said glass consisting essentially of an aluminosilicate having a composition as calculated in weight percent on an oxide basis, of 58-70% SiO₂, 12-22% Al₁₂ O₃, 3-15% B₂ O₃, 2-12% CaO, 0-3% SrO, 0-3% BaO, 0-8% MgO, and SrO and BaO in combination being less than 3%.

2. A substrate glass in accordance with claim 1 which is manufactured by the float process, said glass having a liquidus viscosity greater than about 50 MPa·

s (500 poises).

3. A substrate according to claim 2, wherein said glass has a CTE of 32-38×

10^-7 /°

C. and a strain point over 650°

C.

4. A substrate according to claim 3, wherein said glass has a strain point over 675°

C.

5. A substrate according to claim 3, wherein the combined SrO and BaO content of said glass is less than about 1 weight percent.

6. A substrate according to claim 3, wherein said glass is essentially free of SrO and BaO.

7. A flat panel display comprising a substrate in accordance with claim 1.

8. A substrate according to claim 1, wherein said glass consists essentially of a composition, as calculated in weight percent on an oxide basis, of 58-67% SiO₂, 15-20% Al₂ O₃, 5-13% B₂ O₃, 5-12% CaO, 0-3% SrO, 0-3% BaO, 0-8% MgO, and SrO and BaO in combination is less than 3 wt %.

9. A substrate according to claim 3, wherein said glass consists essentially of a composition, as calculated in weight percent on an oxide basis, of 58-67% SiO₂, 15-20% Al₂ O₃, 5-13% B₂ O₃, 5-12% CaO, 0-3% SrO, 0-3% BaO, 1-8% MgO, and SrO and BaO in combination is less than 3 wt %.

10. A substrate according to claim 9, wherein said glass has a strain point over 675°

C.

11. A substrate according to claim 9, wherein the combined SrO and BaO content of said glass is less than about 1 weight percent.

12. A substrate according to claim 9, wherein the glass has a weight loss less than 5.0 mg/cm² when immersed in 5% HCl at 95°

C. for one hour.

13. A substrate according to claim 1, wherein said glass consists essentially of a composition, as calculated in weight percent on an oxide basis, of 58-64% SiO₂, 16-19% Al₂ O₃, greater than 6 and less than 13% B₂ O₃, 5-11% CaO, 0-3% SrO, 0-3% BaO, 1-8% MgO, and SrO and BaO in combination being less than 3%.

18. A photovoltaic device comprising a substrate in accordance with claim 1.

20. A substrate according to claim 1, wherein MgO+CaO+SrO+BaO is 10-25 weight percent.

21. A substrate according to claim 1, wherein MgO+CaO+SrO+BaO is 8.6-18.2 weight percent.

14. A glass exhibiting a linear coefficient of thermal expansion (CTE) over the temperature range 0-300°

C. between 30-40×

10^-7 /°

C. and a strain point over 600°

C., said glass comprising an aluminosilicate having a composition as calculated in weight percent on an oxide basis, consisting essentially of 58-70% SiO₂, 12-22% Al₂ O₃, 3-15% B₂ O₃, 2-12% CaO, 0-3% SrO, 0-3% BaO, 0-8% MgO, and SrO and BaO in combination being less than 3%.

15. A glass in accordance with claim 14 which is manufactured by the float process, said glass having a liquidus viscosity greater than about 50 MPa·

s (500 poises).

16. A glass according to claim 14, wherein said glass has a CTE of 32-38×

10^-7 /°

C. and a strain point over 650°

C.

17. A glass according to claim 16, wherein said glass has a strain point over 675°

C.

19. A substrate according to claim 14, wherein said glass consists essentially of a composition, as calculated in weight percent on an oxide basis, of 58-67% SiO₂, 15-20% Al₂ O₃, 5-13% B₂ O₃, 5-12% CaO, 0-3% SrO, 0-3% BaO, 1-8% MgO, and SrO and BaO in combination is less than 3 wt %.