Ion exchangeable Li-containing glass compositions for 3-D forming

Patent metadata

Field	Value
Publication number	US-11124444-B2
Application number	US-201816181893-A
Country	US
Kind code	B2
Filing date	Nov 6, 2018
Priority date	Jul 17, 2012
Publication date	Sep 21, 2021
Grant date	Sep 21, 2021

Abstract

According to one embodiment, a glass article may include SiO2, Al2O3, Li2O and Na2O. The glass article may have a softening point less than or equal to about 810° C. The glass article may also have a high temperature CTE less than or equal to about 27×10−6/° C. The glass article may also be ion exchangeable such that the glass has a compressive stress greater than or equal to about 600 MPa and a depth of layer greater than or equal to about 25 μm after ion exchange in a salt bath comprising KNO3 at a temperature in a range from about 390° C. to about 450° C. for less than or equal to approximately 15 hours.

First claim

What is claimed is:

1. A glass composition comprising:
from about 65 mol. % to about 71 mol. % SiO 2 ;
from about 7 mol. % to about 12 mol. % Al 2 O 3 ;
from about 0 mol. % to about 3 mol. % P 2 O 5 ;
from about 1 mol. % to about 9 mol. % Li 2 O;
less than 16 mol. % Na 2 O; and
from about 0 mol. % to about 3 mol % K 2 O;
from 0.8 mol. % to 10 mol. % of a divalent oxide, wherein the divalent oxide comprises MgO, 0 mol. % ZnO, and greater than 0 mol. % to 1 mol. % CaO, wherein:
the glass composition has a softening point less than or equal to about 810° C.; and
the glass composition has a high temperature CTE less than or equal to about 27−10 −6 ° C.

2. The glass composition of claim 1 , wherein the softening point is less than or equal to about 800° C.

3. The glass composition of claim 1 , wherein the high temperature CTE is less than or equal to about 25−10 −6 ° C.

4. The glass composition of claim 1 , wherein the sum of the concentration of Al 2 O 3 (mol. %) and the concentration of the divalent oxide (mol. %) is greater than or equal to about 10 mol. %.

5. The glass composition of claim 4 , further comprising B 2 O 3 in an amount less than or equal to about 1 mol. %.

6. The glass composition of claim 5 , further comprising from about 0.5 mol. % to about 2 mol. % ZrO 2 .

7. The glass composition of claim 1 , wherein MgO is present in an amount less than or equal to about 7 mol. %.

8. The glass composition of claim 1 comprising from about 2 mol. % to about 4 mol. % MgO.

Assignees

• Corning Inc

Inventors

• Comte Marie Jacqueline Monique
• Drake Melinda Ann
• Geisinger Karen Leslie
• Gomez Sinue
• Morena Robert Michael
• Smith Charlene Marie
• Youngman Randall Eugene

Classifications

• Y10T428/315

  Surface modified glass [e.g., tempered, strengthened, etc.] · CPC title

• C03C21/002

  to perform ion-exchange between alkali ions (C03C21/005 takes precedence) · CPC title

• C03C3/091

  containing aluminium · CPC title

• C03C3/089

  containing boron · CPC title

• C03C3/093

  containing zinc or zirconium · CPC title