High refractive index optical borate glass

Patent metadata

Field	Value
Publication number	US-11319243-B2
Application number	US-201916247161-A
Country	US
Kind code	B2
Filing date	Jan 14, 2019
Priority date	Jan 17, 2018
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

A borate glass includes from 25.0 mol % to 70.0 mol % B2O3; from 0.0 mol % to 10.0 mol % SiO2; from 0.0 mol % to 15.0 mol % Al2O3; from 3.0 mol % to 15.0 mol % Nb2O5; from 0.0 mol % to 12.0 mol % alkali metal oxides; from 0.0 mol % to 5.0 mol % ZnO; from 0.0 mol % to 8.0 mol % ZrO2; from 0.0 mol % to 15.0 mol % TiO2; less than 0.5 mol % Bi2O3; and less than 0.5 mol % P2O5. The optical borate glass includes a sum of B2O3+Al2O3+SiO2 from 35.0 mol % to 76.0 mol %, a sum of CaO+MgO from 0.0 mol % to 35.5 mol %. The borate glass has a refractive index, measured at 587.6 nm, of greater than 1.70, a density of less than 4.50 g/cm3, and an Abbe number, VD, from 20.0 to 47.0.

First claim

What is claimed is:

1. A borate glass, comprising:
from greater than or equal to 25.0 mol % to less than or equal to 70.0 mol % B 2 O 3 ;
from greater than or equal to 0.0 mol % to less than or equal to 10.0 mol % SiO 2 ;
from greater than or equal to 0.0 mol % to less than or equal to 15.0 mol % Al 2 O 3 ;
from greater than or equal to 3.0 mol % to less than or equal to 15.0 mol % Nb 2 O 5 ;
from greater than or equal to 0.0 mol % to less than or equal to 12.0 mol % alkali metal oxides;
from greater than or equal to 0.0 mol % to less than or equal to 5.0 mol % ZnO;
from greater than or equal to 0.0 mol % to less than or equal to 8.0 mol % ZrO 2 ;
from greater than or equal to 0.0 mol % to less than or equal to 15.0 mol % TiO 2 ;
less than 0.5 mol % Bi 2 O 3 ; and
less than 0.5 mol % P 2 O 5 , wherein
a sum of B 2 O 3 +Al 2 O 3 +SiO 2 is from greater than or equal to 35.0 mol % to less than or equal to 76.0 mol %,
a sum of CaO+MgO is from greater than or equal to 15.0 mol % to less than or equal to 35.5 mol %,
from greater than or equal to 15.0 mol % to less than or equal to 30.0 mol % CaO,
the borate glass has a refractive index, measured at 587.6 nm, of greater than or equal to 1.70,
the borate glass has a density of less than or equal to 4.50 g/cm 3 , and
the borate glass has an Abbe number, V D , from greater than or equal to 20.0 to less than or equal to 47.0.

2. The borate glass of claim 1 , wherein the borate glass comprises from greater than or equal to 0.0 mol % to less than or equal to 30.0 mol % La 2 O 3 .

3. The borate glass of claim 1 , wherein the borate glass comprises from greater than or equal to 0.0 mol % to less than or equal to 55.0 mol % BaO.

4. The borate glass of claim 1 , wherein the borate glass comprises from greater than or equal to 0.0 mol % to less than or equal to 8.0 mol % SrO.

5. The borate glass of claim 1 , wherein the borate glass comprises from greater than or equal to 20.0 mol % to less than or equal to 30.0 mol % CaO.

6. The borate glass of claim 1 , wherein the borate glass comprises from greater than or equal to 35.0 mol % to less than or equal to 60.0 mol % B 2 O 3 .

7. The borate glass of claim 1 , wherein the borate glass comprises from greater than or equal to 0.0 mol % to less than or equal to 12.0 mol % Li 2 O.

8. The borate glass of claim 1 , wherein the borate glass comprises from greater than or equal to 0.0 mol % to less than or equal to 10.0 mol % Na 2 O.

9. The borate glass of claim 1 , wherein the borate glass comprises from greater than or equal to 0.0 mol % to less than or equal to 0.5 mol % CeO 2 .

10. The borate glass of claim 1 , wherein a sum of Ta 2 O 5 +tungsten oxides+Er 2 O 3 +TeO 2 +Gd 2 O 3 is less than 0.5 mol %.

11. The borate glass of claim 1 , wherein the borate glass is free of Bi 2 O 3 and P 2 O 5 .

12. The borate glass of claim 1 , wherein the borate glass is free from one or more of lead, arsenic, thallium, cadmium, vanadium, mercury, and chromium.

13. The borate glass of claim 1 , wherein the borate glass has a refractive index, measured at 587.6 nm, from greater than or equal to 1.70 to less than or equal to 1.82.

14. The borate glass of claim 1 , wherein the borate glass has a density from greater than or equal to 3.00 g/cm 3 to less than or equal to 4.50 g/cm 3 .

15. The borate glass of claim 1 , wherein the borate glass has an Abbe number, V D , from greater than or equal to 24.0 to less than or equal to 42.0.

16. The borate glass of claim 1 , wherein the borate glass has a Young's modulus from greater than or equal to 75.0 GPa to less than or equal to 120.0 GPa.

17. The borate glass of claim 1 , wherein the borate glass has a glass transition temperature from greater than or equal to 500° C. to less than or equal to 690° C.

18. The borate glass of claim 1 , wherein the borate glass has a CTE from greater than or equal to 6.00 ppm/° C. to less than or equal to 9.50 ppm/° C.

19. The borate glass of claim 1 , wherein the borate glass has a T x onset −T g value of the borate glass is from greater than or equal to 100° C. to less than or equal to 200° C.

20. The borate glass of claim 1 , wherein the borate glass has a liquidus temperature from greater than or equal to 900° C. to less than or equal to 1250° C.

Assignees

• Corning Inc

Inventors

• Guo Xiaoju
• Ma Lina
• Marques Paulo Jorge Gaspar
• Tang Zhongzhi

Classifications

• C03C3/155 Primary

  containing zirconium, titanium, tantalum or niobium · CPC title

• C03C3/068

  containing rare earths · CPC title

• C03C3/064

  containing boron · CPC title

• C03C13/045

  Silica-containing oxide glass compositions · CPC title

• C03C2213/00

  Glass fibres or filaments · CPC title