Glasses

• US 10,683,231 B2
• Filed: 03/23/2016
• Issued: 06/16/2020
• Est. Priority Date: 03/26/2015
• Status: Active Grant

• Current Assignee: Pilkington Group Limited
• Original Assignee: Pilkington Group Limited
• Inventors: Horsley, Martin James, Taylor, Shona
• Primary Examiner(s): Bolden, Elizabeth A.
• Application Number:
  US15/561,261
• Publication Number:
  US 20180118607A1
• Time in Patent Office: 1,546 Days
• CPC Class Codes: C03C 3/087 containing calcium oxide, e.g. common sheet or container glass
• CPC Class Codes: H01L 31/03923 including AIBIIICVI compound materials, e.g. CIS, CIGS
• CPC Class Codes: H01L 31/03925 including AIIBVI compound materials, e.g. CdTe, CdS
• CPC Class Codes: Y02E 10/541 CuInSe2 material PV cells

Abstract

Glasses are disclosed having a composition comprising the following oxides (in weight %): SiO₂ 61 to 70%, Al₂O₃ 0 to 9%, Na₂O 10 to 13%, K₂O 0 to 1%, MgO 2 to 6%, CaO 6 to 16%, SrO 0 to 1%, ZrO₂ 0 to 1%, TiO₂ 2 to 15%, the glasses having a strain point greater than 570° C. The glasses have good dimensional stability at high temperatures, making them suitable for fire protection glazings and substrates which are processed at elevated temperatures, e.g. substrates for display panels, information storage discs and semiconductor devices, including photovoltaic cells. Physical properties of the glasses, such as thermal expansion coefficient, density and refractive index, are disclosed, as are the melting and liquidus temperatures. The glasses are suitable for manufacture by the float process, yielding flat glass in the form of sheets.

Claims

1. A soda lime silica glass having a strain point greater than 570°

C., comprising the following oxides (in weight %);

2. The glass as claimed in claim 1, comprising from 3 to 11% TiO₂.

3. The glass as claimed in claim 1, comprising from 4 to 10% TiO₂.

4. The glass as claimed in claim 1, comprising from 4 to 6% TiO₂.

5. The glass as claimed in claim 1 having a strain point greater than 580°

C.

6. The glass as claimed in claim 1 having a melting temperature (at which viscosity=log 2 poise) less than 1500°

C.

7. The glass as claimed in claim 1 having a liquidus temperature less than 1200°

C.

8. The glass as claimed in claim 1 having a working range (defined as T log 4 poise minus the liquidus temperature) greater than −

100°

C.

9. The glass as claimed in claim 1 having a coefficient of thermal expansion from 70 to 90×

10<sup>−

7</sup>°

C.<sup>−

1</sup> (50-350°

C.).

10. The glass as claimed in claim 1 having a density from 2.50 to 2.70 g cm⁻

3 at 25°

C.

11. The glass as claimed in claim 1 having a refractive index from 1.50 to 1.62.

12. A sheet of glass formed from glass as claimed in claim 1.

13. A glass substrate comprising glass as claimed in claim 1.

14. A photovoltaic cell comprising the glass substrate of claim 13.

15. A flat glass produced by an on-line float glass process, having a strain point greater than 570°

C., comprising the following oxides (in weight %);

16. A glass substrate for a photovoltaic cell comprising the flat glass as claimed in claim 15.

17. A flat glass substrate having a strain point greater than 570°

C., comprising the following oxides (in weight %);

18. A photovoltaic cell comprising the flat glass substrate of claim 17.