Strengthened glass and compositions therefor

Patent metadata

Field	Value
Publication number	US-10144198-B2
Application number	US-201514699263-A
Country	US
Kind code	B2
Filing date	Apr 29, 2015
Priority date	May 2, 2014
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

A glass laminate structure comprising an external glass sheet and an internal glass sheet wherein one or both of the glass sheets comprises SiO2+B2O3+Al2O3≥86.5 mol. %. and R2O—RO—Al2O3<about 5 mol. %. Exemplary glass sheet can comprise between about 69-80 mol. % SiO2, between about 6-12 mol. % Al2O3, between about 2-10 mol. % B2O3, between about 0-5 mol. % ZrO2, Li2O, MgO, ZnO and P2O5, between about 6-15 mol. % Na2O, between about 0-3 mol. % K2O and CaO, and between about 0-2 mol. % SnO2 to provide a mechanically robust and environmentally durable structure.

First claim

What is claimed is:

1. A glass laminate structure comprising:
an external glass sheet;
an internal glass sheet; and
wherein one or both of the glass sheets comprises SiO 2 +B 2 O 3 +Al 2 O 3 ≥86.5 mol. %, B 2 O 3 (mol. %)≤Al 2 O 3 (mol. %), and R 2 O—RO—Al 2 O 3 <about 5 mol. %, and wherein one or both of the glass sheets is ion-exchanged to a compressive stress of at least about 300 MPa and a depth of layer of compressive stress of at least about 15 microns with a Knoop Scratch Threshold>about 12 N and a hardness to modulus ratio greater than about 0.112, or a Vickers indentation threshold in a range from about 10 to about 15 Kg.

2. The glass laminate structure of claim 1 , wherein one or both of the glass sheets comprises either one or both of the following: SiO 2 +B 2 O 3 +Al 2 O 3 ≥about 88 mol. %, and R 2 O—RO—Al 2 O 3 <about 3 mol. %.

3. The glass laminate structure of claim 1 , wherein either the external glass sheet or the internal glass sheet is a chemically strengthened glass sheet and comprises SiO 2 +B 2 O 3 +Al 2 O 3 ≥86.5 mol. %. and R 2 O—RO—Al 2 O 3 <about 5 mol. %, and wherein the other of the external glass sheet or the internal glass sheet comprises a material selected from the group consisting of soda-lime glass and annealed glass.

4. The glass laminate structure of claim 1 , wherein one or both of the glass sheets further comprises:
between about 69-80 mol. % SiO 2 ;
between about 6-12 mol. % Al 2 O 3 ;
between about 2-10 mol. % B 2 O 3 ;
between about 0-5 mol. % ZrO 2 , Li 2 O, MgO, ZnO and P 2 O 5 ;
between about 6-15 mol. % Na 2 O;
between about 0-3 mol. % K 2 O and CaO; and
between about 0-2 mol. % SnO 2 .

5. The glass laminate structure of claim 1 , wherein one or both of the glass sheets further comprises:
between about 72-80 mol. % SiO 2 ;
between about 8-12 mol. % Al 2 O 3 ;
between about 4-10 mol. % B 2 O 3 ;
between about 0-4 mol. % ZrO 2 , MgO, and ZnO;
between about 0-2 mol. % Li 2 O, CaO, and P 2 O 5 ;
between about 7-14 mol. % Na 2 O;
between about 0.1-2.5 mol. % K 2 O; and
between about 0.1-1.5 mol. % SnO 2 .

6. The glass laminate structure of claim 1 , wherein one or both of the glass sheets further comprises:
between about 74-80 mol. % SiO 2 ;
between about 8-11 mol. % Al 2 O 3 ;
between about 4-9 mol. % B 2 O 3 ;
between about 0-2 mol. % ZrO 2 ;
between about 0-3 mol. % MgO and ZnO;
between about 0-1 mol. % Li 2 O and P 2 O 5 ;
between about 7-12 mol. % Na 2 O;
between about 0.1-2.2 mol. % K 2 O;
between about 0-1.5 mol. % CaO; and
between about 0.1-0.5 mol. % SnO 2 .

7. The glass laminate structure of claim 1 , wherein (R 2 O+RO)/(P 2 O 5 +B 2 O 3 +Al 2 O 3 ) is between about 0.5-1.2, between about 0.6-0.9, or between about 0.65-0.85.

8. The glass laminate structure of claim 1 wherein one or both of the glass sheets is ion-exchanged to a compressive stress of at least about 300 MPa and a depth of layer of compressive stress of at least about 15 microns with a Knoop Scratch Threshold >about 16 N and a hardness to modulus ratio>about 0.116.

9. The glass laminate structure of claim 1 , wherein the internal glass sheet has a thickness ranging from about 0.3 mm to about 1.5 mm, and wherein the external glass sheet has a thickness ranging from about 1.5 mm to about 3.0 mm.

10. The glass laminate structure of claim 1 , wherein the external glass sheet has a thickness ranging from about 0.3 mm to about 1.5 mm, and wherein the internal glass sheet has a thickness ranging from about 1.5 mm to about 3.0 mm.

11. The glass laminate structure of claim 1 , further comprising a polymer interlayer between the external and internal glass sheets, wherein the polymer interlayer comprises a single polymer sheet, a multilayer polymer sheet, or a composite polymer sheet.

12. The glass laminate structure of claim 1 , wherein the structure is selected from the group consisting of an automotive side-window, automotive sunroof, automotive windshield, architectural window, and a display.

13. A glass sheet comprising SiO 2 +B 2 O 3 +Al 2 O 3 ≥86.5 mol. %, B 2 O 3 (mol. %)≤Al 2 O 3 (mol. %), and R 2 O—RO—Al 2 O 3 <about 5 mol. %, wherein the glass sheet, when ion-exchanged to a compressive stress of at least about 300 MPa and a depth of layer of compressive stress of at least about 15 microns, has a Knoop Scratch Threshold >about 12 N and a hardness to modulus ratio greater than about 0.112, or a Vickers indentation threshold in a range from about 10 to about 15 Kg.

14. The glass sheet of claim 13 , further comprising either one or both SiO 2 +B 2 O 3 +Al 2 O 3 ≥about 88 mol. %, and R 2 O—RO—Al 2 O 3 <about 3 mol. %.

15. The glass sheet of claim 13 further comprising:
between about 69-80 mol. % SiO 2 ;
between about 6-12 mol. % Al 2 O 3 ;
between about 2-10 mol. % B 2 O 3 ;
between about 0-5 mol. % ZrO 2 , Li 2 O, MgO, ZnO and P 2 O 5 ;
between about 6-15 mol. % Na 2 O;
between about 0-3 mol. % K 2 O and CaO; and
between about 0-2 mol. % SnO 2 .

16. The glass sheet of claim 13 further comprising:
between about 72-80 mol. % SiO 2 ;
between about 8-12 mol. % Al 2 O 3 ;
between about 4-10 mol. % B 2 O 3 ;
between about 0-4 mol. % ZrO 2 , MgO, and ZnO;
between about 0-2 mol. % Li 2 O, CaO, and P 2 O 5 ;
between about 7-14 mol. % Na 2 O;
between about 0.1-2.5 mol. % K 2 O; and
between about 0.1-1.5 mol. % SnO 2 .

17. The glass sheet of claim 13 further comprising:
between about 74-80 mol. % SiO 2 ;
between about 8-11 mol. % Al 2 O 3 ;
between about 4-9 mol. % B 2 O 3 ;
between about 0-2 mol. % ZrO 2 ;
between about 0-3 mol. % MgO and ZnO;
between about 0-1 mol. % Li 2 O and P 2 O 5 ;
between about 7-12 mol. % Na 2 O;
between about 0.1-2.2 mol. % K 2 O;
between about 0-1.5 mol. % CaO; and
between about 0.1-0.5 mol. % SnO 2 .

18. The glass sheet of claim 13 , wherein (R 2 O+RO)/(P 2 O 5 +B 2 O 3 +Al 2 O 3 ) is between about 0.5-1.2, between about 0.6-0.9, or between about 0.65-0.85.

Assignees

• Corning Inc

Inventors

• Cites Jeffrey Scott
• Cleary Thomas Michael
• Couillard James Gregory
• Gomez Sinue
• Moore Michael John
• Morena Robert Michael
• Price James Joseph
• Sorensen Jr Charles Mitchel
• Walter Jonathan Earl

Classifications

• C03C2204/00

  Glasses, glazes or enamels with special properties · CPC title

• C03C4/18

  for ion-sensitive glass · CPC title

• B32B17/10137

  Chemical strengthening · CPC title

• C03C3/097

  containing phosphorus, niobium or tantalum · CPC title

• B32B2307/558

  Impact strength, toughness · CPC title