Optical boroaluminate glasses

Patent metadata

Field	Value
Publication number	US-11247934-B2
Application number	US-201916243506-A
Country	US
Kind code	B2
Filing date	Jan 9, 2019
Priority date	Jan 16, 2018
Publication date	Feb 15, 2022
Grant date	Feb 15, 2022

Abstract

An optical boroaluminate glass article comprises: from greater than or equal to 10.0 mol % to less than or equal to 30.0 mol % Al2O3; from greater than or equal to 10.0 mol % to less than or equal to 55.0 mol % CaO; from greater than or equal to 10.0 mol % to less than or equal to 25.0 mol % B2O3; from greater than or equal to 0.0 mol % to less than or equal to 30.0 mol % SiO2; and from greater than or equal to 1.0 mol % to less than or equal to 20.0 mol % refractive index raising components. The optical boroaluminate glass article has a refractive index of the glass article, measured at 589.3 nm, of greater than or equal to 1.62, and a density of less than or equal to 4.00 g/cm3.

First claim

What is claimed is:

1. An optical boroaluminate glass article comprising:
from greater than or equal to 10.0 mol % to less than or equal to 30.0 mol % Al 2 O 3 ;
from greater than or equal to 10.0 mol % to less than or equal to 55.0 mol % CaO;
from greater than or equal to 10.0 mol % to less than or equal to 25.0 mol % B 2 O 3 ;
from greater than or equal to 0.0 mol % to less than or equal to 30.0 mol % SiO 2 ; and
one of: (a) La 2 O 3 from greater than or equal to 3.0 mol % to less than or equal to 8.0 mol %, or (b) Nb 2 O 5 from greater than or equal to 4.0 mol % to less than or equal to 20.0 mol %, wherein
the optical boroaluminate glass article has a refractive index, measured at 589.3 nm, of greater than or equal to 1.62, and
the optical boroaluminate glass article has a density of less than or equal to 4.00 g/cm 3 .

2. The optical boroaluminate glass article of claim 1 , wherein the optical boroaluminate glass article comprises from greater than or equal to 3.0 mol % to less than or equal to 7.5 mol % La 2 O 3 .

3. The optical boroaluminate glass article of claim 1 , wherein the optical boroaluminate glass article comprises from greater than or equal to 4.0 mol % to less than or equal to 18.0 mol % Nb 2 O 5 .

4. The optical boroaluminate glass article of claim 1 , wherein the optical boroaluminate glass article comprises from greater than or equal to 6.0 mol % to less than or equal to 16.0 mol % Nb 2 O 5 .

5. The optical boroaluminate glass article of claim 1 , wherein the optical boroaluminate glass article comprises:
from greater than or equal to 0.0 mol % to less than or equal to 25.0 mol % BaO;
from greater than or equal to 0.0 mol % to less than or equal to 1.0 mol % SrO;
from greater than or equal to 0.0 mol % to less than or equal to 1.0 mol % SnO 2 ; and
from greater than or equal to 0.0 mol % to less than or equal to 1.0 mol % Sb 2 O 3 .

6. The optical boroaluminate glass article of claim 1 , wherein the optical boroaluminate glass article comprises:
from greater than or equal to 0.0 mol % to less than or equal to 10.0 mol % alkali metal oxides;
a sum of MgO and SrO from greater than or equal to 0.0 mol % to less than or equal to 5.0 mol %; and
from greater than or equal to 0.0 mol % to less than or equal to 1.0 mol % fining agents.

7. The optical boroaluminate glass article of claim 1 , wherein a ratio of CaO+BaO+SrO/Al 2 O 3 , in mol %, is from greater than or equal to 1.10 to less than or equal to 2.40.

8. The optical boroaluminate glass article of claim 1 , wherein a ratio of B 2 O 3 /(CaO+BaO+SrO+Al 2 O 3 ), in mol %, is greater than or equal to 0.15.

9. The optical boroaluminate glass article of claim 1 , wherein a ratio of B 2 O 3 /(CaO+BaO+SrO+Al 2 O 3 ), in mol %, is greater than or equal to 0.20 to less than or equal to 0.50.

10. The optical boroaluminate glass article of claim 1 , wherein the optical boroaluminate glass article has a refractive index, measured at 589.3 nm, greater than or equal to 1.69.

11. The optical boroaluminate glass article of claim 1 , wherein the optical boroaluminate glass article has a refractive index, measured at 589.3 nm, from greater than or equal to 1.69 to less than or equal to 1.80.

12. The optical boroaluminate glass article of claim 1 , wherein the optical boroaluminate glass article has a density from greater than or equal to 2.25 g/cm 3 to less than or equal to 4.00 g/cm 3 .

13. The optical boroaluminate glass article of claim 1 , wherein the optical boroaluminate glass article has a density from greater than or equal to 2.25 g/cm 3 to less than or equal to 3.00 g/cm 3 .

14. The optical boroaluminate glass article of claim 1 , wherein the optical boroaluminate glass article has a liquidus temperature from greater than or equal to 1000° C. to less than or equal to 1350° C.

15. The optical boroaluminate glass article of claim 1 , wherein the optical boroaluminate glass article has Advanced Optics (AO) losses less than or equal to 0.040 mg/mm 2 .

16. The optical boroaluminate glass article of claim 1 , wherein the optical boroaluminate glass article has Advanced Optics (AO) losses less than or equal to 0.005 mg/mm 2 .

17. The optical boroaluminate glass article of claim 1 , wherein the optical boroaluminate glass article has Nano Strip 2X test losses of less than or equal to 0.015 mg/mm 2 .

18. The optical boroaluminate glass article of claim 1 , wherein the optical boroaluminate glass article has a glass annealing temperature from greater than or equal to 550° C. to less than or equal to 680° C.

19. The optical boroaluminate glass article of claim 1 , wherein the optical boroaluminate glass article has a T x −T g value from greater than or equal to 80° C. to less than or equal to 250° C.

20. The optical boroaluminate glass article of claim 1 , wherein the optical boroaluminate glass article has a T x −T g value from greater than or equal to 130° C. to less than or equal to 170° C.

Assignees

• Corning Inc

Inventors

• Aitken Bruce Gardiner
• Ma Lina
• Mauro John Christopher

Classifications

• C03C13/048

  Silica-free oxide glass compositions · CPC title

• C03C3/15 Primary

  containing rare earths · CPC title

• C03C3/145 Primary

  containing aluminium or beryllium · CPC title

• C03C3/068

  containing rare earths · CPC title

• C03C2213/00

  Glass fibres or filaments · CPC title